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WO2000021650A1 - Melangeur statique - Google Patents

Melangeur statique Download PDF

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Publication number
WO2000021650A1
WO2000021650A1 PCT/US1999/022067 US9922067W WO0021650A1 WO 2000021650 A1 WO2000021650 A1 WO 2000021650A1 US 9922067 W US9922067 W US 9922067W WO 0021650 A1 WO0021650 A1 WO 0021650A1
Authority
WO
WIPO (PCT)
Prior art keywords
stream
flow
region
broadening
additive
Prior art date
Application number
PCT/US1999/022067
Other languages
English (en)
Inventor
Steven R. Strand
David A. Eversdyk
Original Assignee
The Dow Chemical Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Dow Chemical Company filed Critical The Dow Chemical Company
Priority to AU63990/99A priority Critical patent/AU6399099A/en
Publication of WO2000021650A1 publication Critical patent/WO2000021650A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3132—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • B01F25/31322—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices used simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3132—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles

Definitions

  • the present invention relates generally to static mixers, and more particularly, to an extensional flow mixer that mixes two or more fluid streams flowing in a pipe.
  • the high viscosity bulk stream and the low viscosity additive stream may remain essentially segregated, resulting in low rates of additive stream incorporation into the bulk stream.
  • mixing occurs by diffusion of one stream into another, which typically is a slow process. The slow diffusion is unacceptable when a quicker mixing time is necessary for dispersion.
  • the additive stream when the additive stream is injected into the bulk stream, the additive stream will remain substantially intact and tunnel through the bulk stream without significant interfacial mixing of the streams. This low mixing rate is due in part to the low surface area contact between the bulk stream and the additive stream.
  • the additive stream initially has, to a relatively flat sheet having more surface area. It is found that deforming the additive stream by increasing its aspect ratio, the ratio of its width to its height, increases its surface area and therefore its potential interfacial mixing area. The increase in surface area also facilitates the strategy of cutting, dividing and recombining the streams in traditional static mixers.
  • the distribution of the additive stream as a thin sheet also increases the mixing efficiency of the static mixing elements, if any, following the extensional flow mixer.
  • Several types of structures are known to promote mixing of a bulk stream with an additive stream, including baffle structures and shear mixers.
  • U.S. Patent No. 4,808,007, issued to King, discloses a dual viscosity mixer which introduces an additive stream to a bulk stream through an entry port within the mixer to create an elongated flat plane of the additive stream.
  • an additive stream such as a catalyst
  • a baffle or other solid contact surface or wall a wetting of the surface with the catalyst occurs, thereby decreasing the overall mixing efficiency of the catalyst with the bulk stream.
  • the present invention provides an extensional flow mixer that overcomes the aforementioned problems by efficiently mixing a bulk stream with an additive stream while minimizing additive stream build-up within the extensional flow mixer.
  • an extensional flow mixer comprising a generally open and hollow flow mixer body having a contoured outer surface.
  • the generally open and hollow flow mixer body has a single entrance port and a single exit port, the single entrance port and the single exit port defining a direction of flow from the single entrance port to the single exit port.
  • the generally hollow body has a longitudinal axis extending through the single entrance port and the single exit port.
  • the extensional flow mixer further comprises a compression region which includes a plurality of contoured lobes. The plurality of contoured lobes in the compression region decrease in size in the direction of flow.
  • a broadening region integral with the compression region also includes a plurality of contoured lobes.
  • the plurality of contoured lobes in the broadening region increase in size in the direction of flow.
  • the number of contoured lobes in the compression region is equal to the number of contoured lobes in the broadening region.
  • the contoured lobes in the compression region alternate with the contoured lobes in the broadening region.
  • the extensional flow mixer is capable of receiving a bulk stream and at least one additive stream such that the interfacial area between the bulk stream and the at least one additive stream is increased as the bulk stream and the at least one additive stream flow through the plurality of contoured lobes in the direction of flow, to promote mixing of the bulk stream and the additive stream.
  • an extensional flow mixing system comprises a generally open and hollow flow mixer body, as described above, has an interior and an exterior and is secured within a flow conductor.
  • a primary additive stream injector is positioned at the single entrance port of the generally open and hollow flow mixer body. The primary additive stream injector injects an additive stream into the interior of the generally hollow flow mixer body in the direction of flow while a bulk stream is flowing through and around the generally hollow flow mixer body.
  • the shape of the generally hollow flow mixer body allows the compressing and broadening of the bulk stream and the additive stream together to facilitate mixing of the bulk stream and the additive stream.
  • an extensional flow mixing system for mixing additive streams with a bulk stream.
  • the mixing system comprises the generally open and hollow flow mixer body described above.
  • a flow conductor containing a bulk stream secures the generally open and hollow flow mixer body therein.
  • a primary additive stream injector is positioned at the entrance port of the generally open and hollow flow mixer body. The primary additive stream injector injects an additive stream into the interior of the generally open and hollow flow mixer body in the direction of flow when the bulk stream is flowing therethrough and around.
  • At least one additional additive stream injector is positioned within the flow conductor. The at least one additional additive stream injector injects at least one additional additive stream into a region external to the generally open and hollow flow mixer body in the direction of flow. Both the primary and the additional additive streams are reshaped to promote mixing of primary and the additional additive streams with the bulk stream.
  • an extensional flow mixing system comprises the generally open and hollow flow mixer body and flow conductor described above.
  • the mixing system includes at least one additive stream injector located within the flow conductor.
  • the additive stream injector injects at least one additive stream into the region external to the generally open and hollow flow mixer body.
  • the at least one additive stream is reshaped by the bulk stream along the exterior of the broadening region to promote mixing of the at least one additive stream with the bulk stream.
  • the at least one additive stream is injected anywhere along the generally open and hollow flow mixer body.
  • a method of mixing an additive stream with a bulk stream comprises the steps of providing a generally hollow flow mixer body as heretofore described, injecting the additive stream into the entrance port of the generally hollow flow mixer body, compressing the additive stream and the bulk stream in the compression region, and broadening the additive stream and the bulk stream in the broadening region.
  • At least one additive stream is injected into a region external to the generally open and hollow extensional flow mixer body.
  • Each additive stream is shaped to increase the interfacial area and facilitate mixing of the at least one additive streams with the bulk stream.
  • Yet another object of the present invention is to provide an extensional flow mixer that is not in direct contact with any additive stream injectors. Still another object of the present invention is to provide an extensional flow mixer that minimizes the bulk stream and additive stream pressure losses.
  • Fig. 1 is a perspective view of one embodiment of the extensional flow mixer of the present invention with a single additive stream injector;
  • Fig. 2 is a frontal view of the extensional flow mixer, looking downstream and showing the extensional flow mixer secured within a portion of the flow conductor, taken along line 2-2 of Fig. 1;
  • Fig. 3 is a rear view of the extensional flow mixer of Fig. 2 looking upstream;
  • Fig. 4 is a side view of the extensional flow mixer in accordance with the present invention secured within the sectioned flow conductor;
  • Fig. 5 is a side sectional view of the extensional flow mixer showing the compression region in accordance with the present invention, taken along line 5-5 of Fig. 1;
  • Fig. 6 is a top sectional view of the extensional flow mixer showing the broadening region in accordance with the present invention, taken along line 6-6 of
  • Fig. 7 is a perspective view showing the primary additive stream injector, plus a preferred location of two additional additive injection streams directed to the exterior of the extensional flow mixer in accordance with one aspect of the invention
  • Fig. 8 is a frontal view showing the primary additive stream injector, plus a preferred position of the two additional additive stream injectors in accordance with one aspect of the invention, taken along line 8-8 of Fig. 7;
  • Fig. 9 is a perspective view of a three lobe per region embodiment of the present invention with the primary additive stream injector;
  • Fig. 10 is a frontal view of the three lobe per region embodiment of the present invention looking downstream, taken along line 10-10 of Fig. 9;
  • Fig. 11 is a rear view of the three lobe per region embodiment of Fig. 9 looking upstream;
  • Fig. 12 is a side view of the three lobe embodiment of the present invention in Fig. 9;
  • Fig. 13 is a plan view showing the three lobe per region embodiment of the present invention, taken 60 degrees above Fig. 12;
  • Fig. 14 is a perspective view of the three lobe per region embodiment of the present invention with the primary additive stream injector and the preferred locations of the additional additive stream injectors;
  • Fig. 15 is a frontal view of the three lobe per region embodiment of the present invention looking downstream, taken along line 15-15 of Fig. 14;
  • Fig. 16 is a perspective view of a four lobe per region embodiment of the present invention with the primary additive stream injector;
  • Fig. 17 is a frontal view of the four lobe per region embodiment of the present invention looking downstream, taken along line 17-17 of Fig. 16;
  • Fig. 18 is a rear view of the four lobe per region embodiment of Fig. 16 looking upstream;
  • Fig. 19 is a side view of the four lobe per region embodiment of the present invention in Fig. 16;
  • Fig. 20 is a plan view showing the four lobe per region embodiment of the present invention, taken 45 degrees above Fig. 19;
  • Fig. 21 is a perspective view of the four lobe per region embodiment of the present invention with the primary additive stream injector and the preferred locations of the additional additive stream injectors;
  • Fig. 22 is a frontal view of the four lobe per region embodiment of the present invention looking downstream, taken along line 22-22 of Fig. 21.
  • Flow mixer 10 has a generally open and hollow-shaped body, which terminates at one end at an edge 12 which defines the outer perimeter of an entrance port 14. Flow mixer 10 terminates at a distal end at an edge 16, shown in phantom, which defines the perimeter of the exit port 18.
  • Flow mixer 10 includes a compression region 20 and a broadening region 22.
  • the compression region is made up of two compression region lobes 34a and 34b, and the broadening region is made up of two broadening region lobes 36a and 36b.
  • the compression region 20 lies in a compression plane that includes line 5-5 and a longitudinal axis extending from the entrance port 14 to the exit port 18.
  • the broadening region 22 lies in a broadening plane that includes line 6-6 and is coaxial with the compression plane of the compression region 20 by sharing the longitudinal axis with the compression plane.
  • the compression plane of the compression region 20 is perpendicular to the broadening plane of the broadening region 22.
  • the compression region lobes 34a and 34b are preferably positioned 90 degrees from the position of the broadening region lobes 36a and 36b.
  • Flow mixer 10 has a generally contoured shape that can be achieved by, for example, deforming a cylinder by constricting one end of the cylinder, rotating the cylinder 90 degrees, and then constricting the other end in a similar manner.
  • the flow mixer 10 resides within a flow conductor 24, for example, a pipe, shown in phantom.
  • Flow conductor 24 conducts a bulk stream, typically of a high viscosity under laminar flow conditions.
  • the flow mixer 10 is useful, however, at a wide range of pipe Reynolds numbers.
  • the flow conductor 24 will conduct a polymer solution as the bulk stream.
  • Particular polymers may include any of a number of copolymers of ethylene and 1-octene, 1-hexene, 1-butene, 4-methyl-l- pentene, styrene, propylene, 1 -pentene or alpha-olefin.
  • the flow conductor 24 introduces the bulk stream to the flow mixer 10 in a direction of flow from the entrance port 14 to the exit port 18.
  • the primary additive stream injector 26 is responsible for carrying an additive stream that is to be mixed with the bulk stream carried by the flow conductor 24.
  • the additive stream is of a low viscosity and is not easily mixed. It is contemplated that many types of additives may be used.
  • the additive stream may include catalyst solutions, monomers, gases dissolved in solvent, antioxidants, UV stabilizers, thermal stabilizers, waxes, color dyes and pigments. Suitable polymers, catalysts and additives contemplated by the present invention include those disclosed in U.S. Patent No. 5,272,236; U.S. Patent No. 5,278,272; and U.S.
  • Patent No. 5,665,800 all issued to Lai et al., and entitled "Elastic Substantially Linear
  • the additive stream may be a catalyst solution or a monomer, such as ethylene dissolved in solvent, which is injected through an outlet 28 of the primary additive stream injector 26 positioned at the entrance port 14.
  • the single additive stream injector 26 is positioned such that its additive stream injector outlet 28 is flush with the plane of the entrance port 14 and aimed at the middle of the entrance port 14.
  • the primary additive stream injector 26 injects the additive stream in the direction of flow without having any physical contact with the flow mixer 10.
  • the primary additive injector 26 can be of many designs other than the tube shown, as long as it is capable of accurately delivering an additive stream.
  • the diameter of the additive stream injector outlet 28 should be large enough that plugging due to impurities is avoided, but preferably small enough so that the exit velocity of the stream from the primary additive stream injector 26, (that is, the jet exit velocity) is greater than or equal to the average bulk stream velocity.
  • Compression region 20 decreases in size along the compression plane in the direction of flow as the broadening region 22 simultaneously increases in size along the broadening plane in the direction of flow. It is the simultaneous compression and broadening of the additive stream that increases the interfacial area between the bulk stream and the additive stream, thus promoting the mixing of the additive stream and the bulk stream as they are channeled through the flow mixer 10.
  • the flow mixer 10 is shown looking downstream in the direction of flow. The flow mixer 10 is suspended and secured within the flow conductor 24 in a symmetrical fashion about the center of the flow conductor 24 by any practical method.
  • the flow mixer 10 is secured by struts 32, such that the flow mixer 10 is substantially stable to be able to withstand the fluid pressure of the bulk stream against the flow mixer 10.
  • the struts 32 are not required, however, as the flow mixer 10 could be glued, welded or otherwise attached to the flow conductor 24.
  • the primary additive stream injector 26 is preferably oriented along the longitudinal axis of the flow mixer 10 and at the center of the entrance port 14 at a midpoint of constricted central entrance portions 30a and 30b.
  • the placement of the primary additive stream injector 26 at the center of the entrance port 14 minimizes the downstream obstructions for the additive stream. The minimization of obstructions also reduces the pressure losses of the streams as they flow through the generally open and hollow body of the flow mixer 10.
  • the compression region 20 and the broadening region 22 are each comprised of a pair of lobe-shaped structures 34a, 34b and 36a, 36b, respectively.
  • the size of the compression region lobes 34a and 34b is greatest at the entrance port 14 and generally decrease in size along the compression region 20 in the direction of flow.
  • the broadening region lobes 36a and 36b in contrast, are at a minimum at the entrance port 14 and generally increase along the broadening region 22 in the direction of flow.
  • the primary additive stream injector 26 is positioned at the entrance port 14 such that there is no obstacle to the additive stream when injected.
  • the bulk stream flowing in flow conductor 24 and the additive stream injected by the additive stream injector 26 are channeled along the interior surface 38 of the compression region lobes 34a and 34b to become narrower in the compression region 20.
  • the size of the lobes 34a and 34b of the compression region 20 should be the same to promote uniform compression of the streams.
  • the compression region lobes 34 meet at the central constricted entrance portions 30a and 30b.
  • the flow mixer 10 is shown looking upstream against the direction of flow and facing the primary additive stream injector 26.
  • the broadening region lobes 36 meet at a central constricted exit portions 40a and 40b of the exit port 18.
  • the bulk stream and the additive stream are channeled from the compression region lobes 34a and 34b of the compression region 20 along the interior surface 42 of the broadening region lobes 36a and 36b until the bulk stream and the additive stream reach their maximum deformation at the exit port 18.
  • the flow patterns of the streams making the sudden but continuous transition from the compression region 20 to the broadening region 22 is sufficient to enhance the mixing of the bulk stream and the additive stream by deforming the additive stream, creating additional surface area.
  • the size of the exit port 18 is preferably that of the entrance port 14, but the exit port 18 should not be smaller than the entrance port 14 to avoid flow reversal inside the flow mixer 10. Additionally, the size and shape of the lobes 36a and 36b of the broadening region 22 should be the same to promote uniform broadening of the streams. Referring to Fig. 4, a side view of the flow mixer 10 is shown. The compression region 20 and the broadening region 22 are integrally formed. The flow mixer 10 is preferably constructed from a single piece of material. Any material that is suitable for the particular construction is contemplated by the present invention.
  • the length of the flow mixer 10 is variable, although preferably it approximates the width of the flow mixer 10 at its widest point.
  • the primary additive stream injector 26 shown in phantom, is positioned along a longitudinal axis of the flow mixer 10.
  • the additive stream injector 26 is preferably placed at the center, directed along the central longitudinal axis.
  • the additive stream injector 26 is also preferably positioned such that there is no direct contact between the additive stream injector 26 and the flow mixer 10.
  • the additive stream injector 26 is preferably positioned flush with the plane of the entrance port 14, the additive stream injector outlet 28 could also be mounted outside the plane of the entrance port 14, preferably by a small distance so that the additive stream will enter into the center of the flow mixer 10.
  • the compression region 20 preferably has a generally triangular shape along the compression plane.
  • the compression region 20 decreases in the direction of flow, such that any fluid streams entering the flow mixer 10 will be narrowed in the direction of flow and channeled along the interior surface 38 of the compression region lobes 34a and 34b towards the path of the injected additive stream coming from the primary additive stream injector 26.
  • the broadening region 22 is also preferably generally triangular in shape along the broadening plane.
  • the broadening region 22 increases in the direction of flow. Fluid within the broadening region 22 will be channeled along the interior surface 42 of the broadening region lobes 36a and 36b. This results in a widening of the flow within the broadening region 22. Consequently, the surface area of the additive stream from primary stream additive injector 26 is increased, thereby increasing its potential interfacial mixing area with the bulk stream.
  • FIG. 7 another embodiment of the flow mixing system is shown.
  • the bulk stream continues to flow through and around the generally open and hollow flow mixer 10.
  • the additional additive stream injectors 50a and 50b are preferably positioned flush with the plane of the entrance port 14 and aimed along the exterior of the generally open and hollow flow mixer 10.
  • the additional additive stream injectors 50a and 50b may inject different additive streams than those injected by the primary additive stream injector 26.
  • the additive stream injectors 50a and 50b are positioned on either side of the primary additive stream 26. It is also contemplated that one or both of the additional additive stream injectors 50a and 50b could be used separately, or each in combination with the primary additive stream injector 26, depending on the number and type of additive streams to be incorporated into the bulk stream. A single additional additive stream injector may be used. Referring to Fig.
  • the additional additive stream injectors 50a and 50b are preferably placed midway between the constricted central entrance portions 30a and 30b and the flow conductor 24, such that the additive stream injectors 126a and 126b are oriented to inject their respective additive streams into the exterior region 37 of the broadening region 22.
  • Each additive stream injected from the additive stream injectors 126a and 126b will then deform in the exterior region 37 of the broadening region 22, causing the interfacial area between each additive stream and the bulk stream to increase, and promote the mixing of the bulk stream and the additive streams.
  • the additional additive stream injectors 50a and 50b inject their respective additive streams simultaneously.
  • the additive stream injectors 50a and 50b can be positioned further from or closer to the flow mixer 10.
  • Additional injection points may be, for example, one-third and two-thirds the distance from the central constricted entrance portions 30a and 30b to the flow conductor 24 on either side of the primary additive stream injector 26 and directed along the exterior 37 of the flow mixer 10.
  • An extensional flow mixer shown generally by the reference numeral 110, includes a generally open and hollow flow mixer body 112.
  • the generally open and hollow flow mixer body 112 has a contoured outer surface 114 and a contoured inner surface 116 which follows the shape of the contoured outer surface 114.
  • the extensional flow mixer 110 includes a single entrance port 118 and a single exit port 120. A direction of flow is defined in moving from the single entrance port 118 to the single exit port 120. A leading edge 126 forms the outline of the single entrance port 118.
  • the generally open and hollow flow mixer body 112 includes a compression region 122.
  • the compression region 122 includes contoured lobes 124a, 124b, and 124c.
  • the contoured lobes 124a, 124b and 124c of the compression region 122 decrease in size in the direction of flow from the leading edge 126 of the single entrance port 118 to the single exit port 120.
  • the generally open and hollow flow mixer body 112 also includes a broadening region 128.
  • the broadening region 128 similarly includes contoured lobes 130a, 130b and 130c (not shown).
  • the contoured lobes 130a, 130b and 130c in the broadening region 128 increase in size in the direction of flow when going from the single entrance port 118 to the single exit port 120.
  • contoured lobes 124a, 124b and 124c of the compression region 122 alternate with the contoured lobes 130a, 130b and 130c of the broadening region 128 around the contoured outer surface 114 of the generally open and hollow flow mixer body 112.
  • a primary additive stream injector 132 is positioned at the single entrance port 118 such that the outlet 134 of the primary additive stream injector 132 is positioned at the center of and flush with the single entrance port 118.
  • the size and shape of the contoured lobes 124a, 124b and 124c of the compression region 122 are preferably the same as the size and shape of the contoured lobes 130a, 130b and 130c of the broadening region 128.
  • the primary additive stream injector 132 is preferably positioned so as to inject a primary additive stream through the interior of the generally open and hollow flow mixer body 1 12 without encountering any obstacles.
  • the bulk stream flowing through the generally open and hollow flow mixer body 112 will compress in the compression region 122 and thereby compress the primary additive stream and increase its interfacial mixing area.
  • the bulk stream enters the single entrance port 118 and is compressed by the contoured inner surface 116 of each of the contoured lobes.
  • the extensional flow mixer 110 is attached to a flow conductor 123, typically a cylinder, preferably by way of struts 125, although any suitable attachment method is acceptable.
  • a flow conductor 123 typically a cylinder, preferably by way of struts 125, although any suitable attachment method is acceptable.
  • a side view of the extensional flow mixer 110 shows that the primary additive stream injector is positioned along the longitudinal axis of the extensional flow mixer 110.
  • the primary additive stream injector 132 is flush with the plane of the single entrance port 118.
  • the compression region 122 decreases in size in the direction of flow while the broadening region 128 increases in size in the direction of flow. It is the simultaneous converging of the compression region 122 and the diverging of the broadening region 128 that causes the increase in interfacial area between the bulk stream and any additive streams injected by the primary additive stream injector 132.
  • the compression region 122 is integrally formed with the broadening region 128 such that the contoured outer surface 114 does not contain any severe angular regions or step-like features that may decrease the overall mixing efficiency of the extensional flow mixer 110.
  • 138c may be oriented such that they are aimed toward the contoured outer surface 114 of the generally open and hollow flow mixer body 112.
  • the additional additive stream injectors 138a, 138b and 138c are shown.
  • the additional additive stream injectors 138a, 138b and 138c are directed towards the exterior of each of the contoured lobes 130a, 130b and 130c of the broadening region 128. It is understood that fewer additional additive streams may be utilized in conjunction with the primary additive stream injector 132. It is important to note that again, there is no direct contact between neither the primary additive stream injector 132 nor the additional additive stream injectors 138a, 138b and 138c with the generally open and hollow flow mixer body 112.
  • the absence of direct contact reduces the likelihood of additive build-up and fouling on the flow mixer body 112 during operation.
  • An extensional flow mixer shown generally by the reference numeral 210, includes a generally open and hollow flow mixer body 212.
  • the generally open and hollow flow mixer body 212 has a contoured outer surface 214 and a contoured inner surface 216 which follows the shape of the contoured outer surface 214.
  • the extensional flow mixer 210 includes a single entrance port 218 and a single exit port 220. A direction of flow is defined in moving from the single entrance port 218 to the single exit port 220.
  • the generally open and hollow flow mixer body 212 includes a compression region 222.
  • the compression region 222 includes contoured lobes 224a, 224b, 224c and
  • the contoured lobes 224a, 224b, 224c and 224d of the compression region 222 decrease in size in the direction of flow from the leading edge 226 of the single entrance port 218 to the single exit port 220.
  • the leading edge 226 forms the outline of the single entrance port 218.
  • the generally open and hollow flow mixer body 212 also includes a broadening region 228.
  • the broadening region 228 similarly includes contoured lobes
  • the contoured lobes 230a, 230b, 230c and 230d in the broadening region 228 increase in size in the direction of flow when going from the single entrance port 218 to the single exit port 220.
  • the contoured lobes 224a, 224b, 224c and 224d of the compression region 222 alternate with the contoured lobes 230a, 230b, 230c and 230d of the broadening region 228 around the contoured outer surface
  • a primary additive stream injector 232 is preferably positioned at the single entrance port 218 such that the outlet 234 of the primary additive stream injector 232 is positioned at the center of and flush with the single entrance port 218. Referring now to Fig. 17, the size and shape of the contoured lobes 224a, 224b,
  • 224c and 224d of the compression region 222 are preferably the same as the size and shape of the contoured lobes 230a, 230b, 230c and 230d of the broadening region 228.
  • the primary additive stream injector 232 is preferably positioned so as to inject a primary additive stream through the interior of the generally open and hollow flow mixer body 212 without encountering any obstacles.
  • the bulk stream flowing through the generally open and hollow flow mixer body 212 will compress in the compression region 222 and thereby compress the primary additive stream and increase its interfacial mixing area.
  • the bulk stream enters the single entrance port 218 and is compressed by the contoured inner surface 216 of each of the contoured lobes.
  • the extensional flow mixer 210 is attached to a flow conductor 223, typically a cylinder, preferably by way of struts 225, although any suitable mode of attachment is acceptable.
  • the outlet 234 of the primary additive stream injector 232 is visible from the single exit port 220.
  • the single exit port 220 is preferably the same size, but not smaller than, the single entrance port 218.
  • the contoured lobes 230a, 230b, 230c and 230d of the broadening region 228 are at their maximum and terminate at the trailing edge 236 which defines the outer perimeter of the single exit port 220.
  • a side view of the extensional flow mixer 210 shows that the primary additive stream injector 232 is positioned along the longitudinal axis of the extensional flow mixer 210.
  • the primary additive stream injector 232 is flush with the plane of the single entrance port 218.
  • the compression region 222 decreases in size in the direction of flow while the broadening region 228 increases in size in the direction of flow. It is the simultaneous converging of the compression region 222 and the diverging of the broadening region 228 that causes the increase in interfacial area between the bulk stream and any additive streams injected by the primary additive stream injector 232.
  • the compression region 222 is integrally formed with the broadening region 228 such that the contoured outer surface 214 does not contain any severe angular regions or step-like features that may decrease the overall mixing efficiency of the extensional flow mixer 210.
  • additional additive stream injectors 238a, 238b, 238c and 238d are oriented such that they are aimed toward the contoured outer surface 214 of the generally open and hollow flow mixer body 212.
  • the additional additive stream injectors 238a, 238b, 238c and 238d are shown.
  • the additional additive stream injectors 238a, 238b, 238c and 238d are directed towards the exterior of each of the contoured lobes 230a, 230b, 230c and 230d of the broadening region 228. It is understood that fewer additional additive stream injectors may be utilized in conjunction with the primary additive stream injector 232.
  • the method of the present invention is directed to mixing an additive stream with a bulk stream. It is important to note that the method contemplated by the present invention is independent of the sequence of the particular bulk stream and additive streams entering the flow mixer, and is also independent of the relative concentrations of the bulk stream with respect to the primary and additional additive streams. Additionally, many types of bulk streams and additive streams heretofore mentioned are contemplated by the present method. Particularly, additives such as catalysts, monomers, pigments, dyes, anti-oxidants, stabilizers, waxes, and modifiers are added to bulk streams including various polymer and co-polymer melts, solutions and other viscous liquids.
  • additives such as catalysts, monomers, pigments, dyes, anti-oxidants, stabilizers, waxes, and modifiers are added to bulk streams including various polymer and co-polymer melts, solutions and other viscous liquids.
  • the generally open and hollow flow mixer is provided as heretofore described.
  • An additive stream is injected into the single entrance port of the generally open and hollow flow mixer body.
  • the additive stream and the bulk stream are compressed in the compression region and broadened in the broadening region to increase the interfacial area between the bulk stream and the additive stream to promote mixing of the bulk and the additive stream.
  • the compressing and broadening steps preferably occur simultaneously.
  • At least one additional additive injector is utilized along with at least one primary additive stream injector, by injecting at least one additional additive stream into the region exterior to the generally hollow flow mixer body, resulting in deformation of each of the additional additive streams in the exterior region of the generally hollow flow mixer body.
  • the additional additive streams are shaped into curved sheets by the bulk flow field created by the exterior of the generally hollow flow mixer body. It can be appreciated that there are many combinations of primary and additive stream injectors which inject their streams both internally and externally to the generally hollow flow mixer body.
  • extensional flow mixer 10 may be used to mix, in addition to liquids, a gas with a gas, a gas with a liquid, or an immiscible liquid with a liquid.
  • the extensional flow mixer 10 may be used in laminar, transition or turbulent flow conditions.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)

Abstract

L'invention concerne un mélangeur de flux extensionnel, conçu pour mélanger un courant en masse à un courant additif. Le mélangeur de flux extensionnel présente un corps généralement creux et ouvert, possédant un seul orifice d'entrée et un seul orifice de sortie. Le passage du premier orifice d'entrée unique à l'orifice de sortie unique définit un sens d'écoulement. Le corps généralement ouvert et creux possède une région de compression et une région d'agrandissement. La région de compression comprend plusieurs lobes qui vont décroissant dans le sens d'écoulement. La région d'agrandissement comporte plusieurs lobes qui vont augmentant dans le sens d'écoulement. Les lobes de la région de compression alternent avec les lobes de la région d'agrandissement. Le courant en masse et le courant additif sont introduits au niveau de l'orifice d'entrée du corps généralement ouvert et creux. Les courants sont comprimés par la région de compression et agrandis par la région d'agrandissement, à mesure qu'ils s'écoulent le long du corps généralement creux, de sorte que la zone d'interface entre le courant en masse et le courant additif soit augmentée et que l'additif soit distribué dans le canal d'écoulement. Des courants supplémentaires peuvent être introduits depuis l'extérieur. L'augmentation de la zone d'interface favorise le mélange du courant en masse et du courant additif, ce qui permet l'augmentation de la vitesse d'incorporation du courant additif dans le courant en masse. Le mélangeur de flux extensionnel est particulièrement utile dans le procédé de polymérisation, lors du mélangeage d'additifs, de catalyseurs et de monomères, de faible viscosité, à un courant en masse formé d'une solution polymère, de viscosité supérieure.
PCT/US1999/022067 1998-10-15 1999-09-23 Melangeur statique WO2000021650A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63990/99A AU6399099A (en) 1998-10-15 1999-09-23 Static mixer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17322098A 1998-10-15 1998-10-15
US09/173,220 1998-10-15

Publications (1)

Publication Number Publication Date
WO2000021650A1 true WO2000021650A1 (fr) 2000-04-20

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TW (1) TW449500B (fr)
WO (1) WO2000021650A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6698917B2 (en) 2001-06-01 2004-03-02 E. I. Du Pont De Nemours And Company Process for blending fluids of widely differing viscosities
DE102007002291A1 (de) * 2007-01-16 2008-07-17 Fresenius Hemocare Deutschland Gmbh Vorrichtung und Verfahren zum Filtrieren einer Mischung einer Blutkomponente und einer Additivlösung
DE112004001604B4 (de) * 2003-09-05 2009-09-03 Zhaoyan Liu Dreidimensionale quer angeordnete Umlenkeinrichtung als inneres Element in einem Rohr, einem Fass oder einem Turm
WO2011091123A1 (fr) 2010-01-22 2011-07-28 Dow Global Technologies LLC (Formerly known as Dow Global Technologies Inc.) Système de mélange comprenant un mélangeur de flux en extension
US8722817B2 (en) 2009-06-05 2014-05-13 Dow Global Technologies Llc Process to make long chain branched (LCB), block, or interconnected copolymers of ethylene

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US3358749A (en) * 1966-07-22 1967-12-19 Dow Chemical Co Interfacial surface generator and method of preparation thereof
US3583678A (en) * 1969-09-15 1971-06-08 Dow Badische Co Interfacial surface generators
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6698917B2 (en) 2001-06-01 2004-03-02 E. I. Du Pont De Nemours And Company Process for blending fluids of widely differing viscosities
DE112004001604B4 (de) * 2003-09-05 2009-09-03 Zhaoyan Liu Dreidimensionale quer angeordnete Umlenkeinrichtung als inneres Element in einem Rohr, einem Fass oder einem Turm
US7753080B2 (en) 2003-09-05 2010-07-13 Zhaoyan Liu Three-dimensionally intersecting diverter as an inner member for a pipe, barrel or tower
DE102007002291A1 (de) * 2007-01-16 2008-07-17 Fresenius Hemocare Deutschland Gmbh Vorrichtung und Verfahren zum Filtrieren einer Mischung einer Blutkomponente und einer Additivlösung
US8722817B2 (en) 2009-06-05 2014-05-13 Dow Global Technologies Llc Process to make long chain branched (LCB), block, or interconnected copolymers of ethylene
WO2011091123A1 (fr) 2010-01-22 2011-07-28 Dow Global Technologies LLC (Formerly known as Dow Global Technologies Inc.) Système de mélange comprenant un mélangeur de flux en extension
US20120287744A1 (en) * 2010-01-22 2012-11-15 Dow Global Technologies Llc Mixing system comprising an extensional flow mixer
CN102917779A (zh) * 2010-01-22 2013-02-06 陶氏环球技术有限责任公司 包括拉伸流动混合器的混合系统
JP2013517927A (ja) * 2010-01-22 2013-05-20 ダウ グローバル テクノロジーズ エルエルシー 伸張流れ混合装置を備える混合システム
US8876365B2 (en) 2010-01-22 2014-11-04 Dow Global Technologies Llc Mixing system comprising an extensional flow mixer
CN102917779B (zh) * 2010-01-22 2015-12-02 陶氏环球技术有限责任公司 包括拉伸流动混合器的混合系统
KR101788893B1 (ko) * 2010-01-22 2017-10-20 다우 글로벌 테크놀로지스 엘엘씨 신장 유동 혼합기를 포함하는 혼합 시스템

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AU6399099A (en) 2000-05-01

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