WO2003018168A1 - Chemical reactor, equipped with a level regulator, for processing hair slurry that contains sodium sulphide - Google Patents
Chemical reactor, equipped with a level regulator, for processing hair slurry that contains sodium sulphide Download PDFInfo
- Publication number
- WO2003018168A1 WO2003018168A1 PCT/EP2002/009176 EP0209176W WO03018168A1 WO 2003018168 A1 WO2003018168 A1 WO 2003018168A1 EP 0209176 W EP0209176 W EP 0209176W WO 03018168 A1 WO03018168 A1 WO 03018168A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure
- level
- pump
- valve
- gas space
- Prior art date
Links
- 239000000126 substance Substances 0.000 title claims abstract description 7
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 title claims description 6
- 239000002002 slurry Substances 0.000 title 1
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims description 37
- 239000000523 sample Substances 0.000 claims description 9
- 239000010802 sludge Substances 0.000 claims description 8
- 239000012495 reaction gas Substances 0.000 claims description 5
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002951 depilatory effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0063—Regulation, control including valves and floats
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/24—Stationary reactors without moving elements inside
- B01J19/2415—Tubular reactors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00002—Chemical plants
- B01J2219/00004—Scale aspects
- B01J2219/00006—Large-scale industrial plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00002—Chemical plants
- B01J2219/00027—Process aspects
- B01J2219/0004—Processes in series
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00182—Controlling or regulating processes controlling the level of reactants in the reactor vessel
Definitions
- the invention relates to a chemical reactor, in particular for processing sodium sulphide-containing hair sludge, with at least one column which has a liquid filling and an internal gas space at the top, with a pump which feeds circulating gas into the liquid from below and optionally together with it sucks a reaction gas to be separated from a separating device out of the inner gas space, and with a device controlled by a fill level controller for generating a negative pressure in the inner gas space, with which the working level is kept at a predetermined level above a reference level.
- the column is treated with aqueous sodium sulfide-containing hair sludge from a depilatory system for skins and acidic circulating water.
- the resulting hydrogen sulfide is suctioned off together with the inert cycle gas, for example nitrogen, and removed from the cycle gas with the aid of an absorber.
- the lower part of the column is connected to an open container by a liquid seal. Its liquid level defines the reference level. The vacuum in the interior gas space to improve the desorption of the hydrogen sulfide and prevents the escape of this toxic 'gas at a leak.
- a vacuum source is used to generate the vacuum, which can be connected to the suction side of the pump via a valve regulated by the liquid level.
- This vacuum source is complex, especially since it must at least be able to generate the vacuum corresponding to the working level. You also need a high-quality valve, - which allows a precise setting of the opening cross-section of the valve for control purposes. In addition, there is the problem of recirculating gas that is extracted without affecting the control process.
- the invention has for its object to perform a simple and safe level control in a chemical reactor at a predetermined negative pressure in the gas space.
- the pump is connected to an external gas space both on the suction side and on the pressure side, the pressure of which is above the lower pressure, but is below the pump pressure, and the suction valve for lowering and the pressure valve for raising the working level can be opened.
- the pump not only serves to drive the cycle gas, but also to generate the negative pressure. There is no need for a separate vacuum source. Since the pressure in the outer gas space should be above the required negative pressure, very simple means are sufficient, e.g. a prestressed pressure accumulator, or pressure-influencing means can be dispensed with entirely, namely if the atmospheric pressure is also used for the outer gas space.
- the valves can have a very simple structure. An on-off function is sufficient to perform its task. Since gas is both removed from the circuit and introduced into it during regulation, the amount of circulating gas remains constant on average. In operation, very small amounts of gas, which are introduced into or removed from the circuit, are sufficient to effect level control in a large reactor.
- the solution is particularly simple if the two valves open to the atmosphere. This is possible if an inert or non-toxic cycle gas, e.g. N 2 , is used, which can be easily released into the atmosphere, and if the atmospheric oxygen does not interfere with the entry into the cycle, be it because of its extremely small amount, either because it leads to oxidation in a harmless way.
- the fill level controller has two probes defining an upper and a lower limit level and that the pressure-side valve opens when the value falls below and the suction-side valve when the upper limit level is exceeded. With the help of simple on-off valves, the working level can be kept constant within narrow limits.
- the hair sludge reactor shown in the single figure has a first column 1 with a liquid filling 2 and an inner gas space 3, and a second column 4 with liquid filling 5 and an inner gas space 6.
- the inner gas space of the first column is supplied with hair sludge 7 via a line, which is formed by treating the outside of a hide with aqueous sodium sulfide and then separating the hair.
- the liquid filling 2 is fed via a line 8 to circulating water, which is adjusted to a predetermined pH in the lower region of the first column 1 using an acid, such as hydrochloric or sulfuric acid.
- the hair / liquid mixture is introduced from the top of column 1 via an overflow line 9 into the lower part of column 4.
- a line 10 acting as a liquid seal leads to an open container 11, which is filled up to a reference level 12 with liquid 13, here the processed hair mud.
- This sludge runs, for example, via a run-off track 14 onto a screening and pressing device 15, in which the water is separated into a container 16 and dewatered hair sludge can be removed at the end 17 for further use as fertilizer or feed.
- the water 18 collected in the container 16 is returned to the column 1 via a line 19 and a pump 20.
- a pump 21 feeds an inert circulating gas, for example nitrogen, into the lower end of the column 1 via a pressure line 22.
- a pump 23 feeds this recycle gas into the lower end of the column 4 via a pressure line 24.
- the common line section 26 there is a separating device 27 which separates the reaction gas from the recycle gas and is formed, for example, by an absorber.
- the common line section leads to the suction sides the two pumps 21 and 23. Because of the suction effect, the working level '28 in the two columns 1 and 4, the height h raised above the reference level 12th As a result of this negative pressure and the circulating gas passing through the liquid, the reaction gas is very well desorbed from the liquid.
- a fill level control device 29 comprises a fill level sensor 30 assigned to the column 4 with a probe 31, which defines an upper limit level, and a probe 32, which defines a lower limit level.
- a pressure-side valve 33 or a suction-side valve 34 are actuated.
- the pressure-side valve 33 lies in a line 35, which connects the pump pressure side 22 to an outer gas space 36, which is under atmospheric pressure.
- the suction-side valve 34 lies in a line 37- which connects the suction side of the pump 21 with this outer gas space 36.
- the two valves are solenoid valves, which release a small throttle opening when excited.
- the suction-side valve 34 opens when both probes are wetted.
- the pressure-side valve 33 opens when no probe is wetted. Both valves are closed when only the lower probe is wetted. In this way, a working level between the two probes 31 and 32 is maintained.
- the reactor can also be equipped with only one column. It 'can also be more connected as two columns in series. To further accelerate and even out the reaction, the columns with a pulsator can improve the vortex formation Perforated disks or with motor-driven mixers, separated by perforated disks.
- the outer gas space can, for example, have atmospheric pressure or be formed by a container, one wall of which is provided with a movable wall, such as a membrane, which is exposed to atmospheric pressure. If necessary, this membrane can also be biased by a different pressure, in particular by the reference pressure which acts on the reference level 12 if this does not correspond to the atmospheric pressure.
- the valves 33 and 34 can also be controlled with a float switch.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001140392 DE10140392A1 (en) | 2001-08-23 | 2001-08-23 | Chemical reactor, in particular for the treatment of hair sludge containing sodium sulfide |
DE10140392.5 | 2001-08-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003018168A1 true WO2003018168A1 (en) | 2003-03-06 |
Family
ID=7695768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/009176 WO2003018168A1 (en) | 2001-08-23 | 2002-08-16 | Chemical reactor, equipped with a level regulator, for processing hair slurry that contains sodium sulphide |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE10140392A1 (en) |
WO (1) | WO2003018168A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008030714A1 (en) * | 2008-06-27 | 2009-12-31 | Hydac Cooling Gmbh | Device for separating gaseous components, in particular air, from liquid operating media |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE122938C (en) * | ||||
US5211842A (en) * | 1992-01-07 | 1993-05-18 | Conoco Inc. | Three-phase well test apparatus using pumped recirculation to maintain homogenous flow |
US5544672A (en) * | 1993-10-20 | 1996-08-13 | Atlantic Richfield Company | Slug flow mitigation control system and method |
WO1998034709A1 (en) * | 1997-02-06 | 1998-08-13 | Jens Pannenborg | Process for degassing liquids |
US6171367B1 (en) * | 1997-06-05 | 2001-01-09 | Taiwan Semiconductor Manufacturing Co., Ltd | Method and apparatus for delivering and recycling a bubble-free liquid chemical |
-
2001
- 2001-08-23 DE DE2001140392 patent/DE10140392A1/en not_active Withdrawn
-
2002
- 2002-08-16 WO PCT/EP2002/009176 patent/WO2003018168A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE122938C (en) * | ||||
US5211842A (en) * | 1992-01-07 | 1993-05-18 | Conoco Inc. | Three-phase well test apparatus using pumped recirculation to maintain homogenous flow |
US5544672A (en) * | 1993-10-20 | 1996-08-13 | Atlantic Richfield Company | Slug flow mitigation control system and method |
WO1998034709A1 (en) * | 1997-02-06 | 1998-08-13 | Jens Pannenborg | Process for degassing liquids |
US6171367B1 (en) * | 1997-06-05 | 2001-01-09 | Taiwan Semiconductor Manufacturing Co., Ltd | Method and apparatus for delivering and recycling a bubble-free liquid chemical |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008030714A1 (en) * | 2008-06-27 | 2009-12-31 | Hydac Cooling Gmbh | Device for separating gaseous components, in particular air, from liquid operating media |
Also Published As
Publication number | Publication date |
---|---|
DE10140392A1 (en) | 2003-03-06 |
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