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WO1993018226A1 - Destruction d'ozone combinee a l'elimination des fibres dans une fabrique de pate a papier - Google Patents

Destruction d'ozone combinee a l'elimination des fibres dans une fabrique de pate a papier Download PDF

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Publication number
WO1993018226A1
WO1993018226A1 PCT/US1993/001144 US9301144W WO9318226A1 WO 1993018226 A1 WO1993018226 A1 WO 1993018226A1 US 9301144 W US9301144 W US 9301144W WO 9318226 A1 WO9318226 A1 WO 9318226A1
Authority
WO
WIPO (PCT)
Prior art keywords
ozone
recited
pulp
bleaching
practiced
Prior art date
Application number
PCT/US1993/001144
Other languages
English (en)
Inventor
Lawrence A. Hinkey
Lee H. Fleming
Brian F. Greenwood
Original Assignee
Kamyr, Inc.
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 Kamyr, Inc. filed Critical Kamyr, Inc.
Priority to AU36153/93A priority Critical patent/AU3615393A/en
Publication of WO1993018226A1 publication Critical patent/WO1993018226A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/66—Ozone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/06—Treatment of pulp gases; Recovery of the heat content of the gases; Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO2, e.g. arising from liquors containing sulfur compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone

Definitions

  • ozone bleaching In the treatment of chemical paper pulps, ozone bleaching is becoming commercially accepted. A number of different ozone bleaching systems and procedures have been developed for treating pulp with varying consistencies. These systems hold promise for greatly reducing the reliance on chlorine that presently exists in commercial pulp mills, and thereby avoid the environmental consequences associated with chlorine bleaching.
  • the ozone with oxygen as a carrier gas is intimately mixed with the pulp and, after a relatively short reaction time, the carrier gas with any remaining ozone is separated from the pulp utilizing a wide variety of different mechanisms. After the separation, for safety and in order to comply with good environmental techniques, it is necessary to destroy the residual ozone in the off-gas from the ozone bleaching stage. This i ⁇ typically done utilizing a separate thermal or catalytic destruct system.
  • the problems of removing fiber and unreacted ozone from the off-gases from a Z stage are solved simultaneously in a relatively inexpensive and efficient manner.
  • the chemical oxygen demand (COD) of a liquid waste stream in the pulp mill may be simultaneously reduced, in the same reaction in which ozone is destroyed. It is known from the treatment of waste water with ozone, such as shown in U.S. patents 3,546,114 and 4,007,118, that ozone will react with dissolved organic material in a liquid stream and that at alkaline pH levels, the rate of reaction i ⁇ highest.
  • a method and apparatus which scrub the fibers from the off-gas stream of an ozone bleaching stage with a liquid containing dissolved organic material, preferably at an alkaline pH, so that not only does the scrubbing liquid effectively remove the fibers from the gas stream, but also reacts with the ozone, causing destruction of the ozone and eliminating the need for a separate thermal ozone destruct device.
  • a method of simultaneously removing organic fibers and destroying ozone in a primarily gaseous stream containing organic fibers and ozone comprises, in its most basic, broadest form, the step of (a) scrubbing the gaseous stream with an alkaline liquid containing dissolved organic material-
  • the scrubbing liquid is a liquid waste stream from a bleaching stage of the pulp mill, such as filtrate from an alkaline extraction stage such as an E stage at a pH of above about 9.0, or bisulfite containing liquid from a sulfite mill.
  • Step (a) is preferably practiced in a catenary grid type scrubber although it may also be practiced in a venturi type scrubber or the like. Also there is preferably the further step of passing the scrubbed gaseous stream to oxygen recovery or atmosphere exhaust without the necessity of passing it through a separate ozone destruction stage (such a ⁇ a thermal or catalytic stage), or at least minimizing the size of the thermal or catalytic stage. Where a catenary grid type scrubber is utilized, there i ⁇ -also the step of further scrubbing (washing) the stream with water between the scrubbing with the alkaline liquid and the discharge from the scrubber.
  • a method of treating fluids and slurries from a paper pulp producing process in a mill containing a plurality of different bleaching stages, including at least one ozone stage.
  • the method comprise ⁇ the ⁇ tep ⁇ of:
  • step (b) ⁇ imultaneously effectively removing the organic fibers and ozone from the gaseous steam from step (a) by bringing the gaseous stream into scrubbing contact with a waste liquid stream form one of the bleaching stages besides an ozone stage, or bisulfite liquid from a sulfite mill.
  • the scrubbing liquid is preferably as described above, and in some circumstances (e.g. if bi ⁇ ulfite liquid is used as the scrubbing liquid), a scrubbed gaseous stream can be passed to oxygen recovery or atmosphere exhaust without passing it through another special ozone destruction stage.
  • a system for treating paper pulp and off-gases from paper pulp processing has the following elements: An ozone bleaching ves ⁇ el having a pulp outlet. A means for separating the vast . majority of the pulp fiber ⁇ from off gases in the ozone bleaching vessel to produce a gaseous stream. A scrubber having a gas discharge. A first conduit connecting the scrubber directly to the means for separating pulp fibers from off gases. A second bleaching vessel distinct from the ozone bleaching vessel, and having a waste liquid stream discharge; and a ⁇ econd conduit connecting the second bleaching vessel waste liquid stream discharge to the scrubber.
  • an oxygen recovery or an atmosphere exhaust apparatus i ⁇ preferably directly connected to the gas discharge from the scrubber without intervention of separate apparatus specifically for ozone destruction, although a reduced size (compared to conventional) separate ozone destruction apparatus may be neces ⁇ ary in many circumstance ⁇ .
  • the scrubber preferably comprises a catenary grid type scrubber, although a venturi type or the like may be used.
  • FIGURE 1 is a schematic representation of an exemplary prior art sy ⁇ tem for ozone bleaching and destruction
  • FIGURE 2 i ⁇ a schematic representation showing a ⁇ ystem for treating paper pulp, and off gases from paper pulp processing, according to the invention which effect practice of the method according to the invention.
  • the ozone bleach stage/vessel is illustrated schematically by reference numeral 10 and may be of any conventional type for treating ozone of low, medium, or high con ⁇ istency.
  • a mixer 11 may be utilized to which pulp and ozone in a carrier gas (primarily oxygen) are supplied.
  • the ozone typically is about 2-14% by weight of the ga ⁇ supplied to mixer 11.
  • the device 13 may comprise any suitable conventional device such a ⁇ a cyclone, dega ⁇ ing pump, particularly ⁇ haped ves ⁇ el, etc.
  • the conduit 14 extending from the top of the ⁇ eparating device 13 contain ⁇ a ga ⁇ stream which is primarily a carrier gas but al ⁇ o includes a small amount of residual ozone, and also -- depending upon the ozone stage 10 and device 13 -- a small amount of organic fiber.
  • Conduit 14 leads to an ozone destruction device 15 such as a thermal destruct ⁇ ystem and ultimately the gas steam, with the ozone removed, passes on to apparatus 16 for oxygen recovery and/or atmosphere exhaust.
  • FIGURE 2 illustrates a sy ⁇ tem according to the invention having the components 10 through 14 the ⁇ ame a ⁇ in the prior art of FIGURE 1.
  • the conduit 14 containing a gas stream with some ozone and organic fiber -- is directly connected to a scrubber 20 inlet 21.
  • the ⁇ crubber 20 illustrated in FIGURE 2 is a catenary grid type ⁇ crubber, which is a type often used to scrub the wa ⁇ te ga ⁇ from chlorine dioxide stages in conventional pulp bleach plants. It includes a vessel 22 mounting a plurality of grids 23 through which the gas stream pas ⁇ e ⁇ (flowing upwardly), the grid ⁇ 23 typically vertically ⁇ paced about 2 feet.
  • the vessel 22 may have a diameter of about 14 inches at the bottom and 18 inches at the top.
  • the height of the ves ⁇ el may be on the order of 15-1/2 feet.
  • the scrubbing liquid preferably is a waste liquid stream from another bleaching stage (besides an ozone stage) in the pulp mill, preferably an alkaline stage (e. g. an alkaline extraction ⁇ tage), such as an E stage, at a pH of about 9.0 or higher (e.g. about 9-11) .
  • FIGURE 2 illustrate ⁇ a conduit 28 from an E ⁇ tage 29 supplying filtrate from the wash part of the E stage 29 to the inlet 27.
  • Such liquid is alkaline, typically having a pH of over about 9 (e.g. about 9-11).
  • Source 29' is a conventional, already existing, source of bisulfite liquid in a sulfite mill.
  • Fiber ⁇ in the underflow from outlet 31 may be recovered by filtering in a suitable fiber recovery device 32, such as a drum filter, flat screen, pressure screen, etc.
  • Vane wash water (typically about 1/18 the volume of the alkaline liquid supplied in conduit 28) i ⁇ sprayed upwardly — utilizing spray head 33 — to the vane assembly 24, being supplied with water source 34.
  • the ga ⁇ discharged from the outlet 25 at the top of the ves ⁇ el 22 passes through conduit 36 directly to an ozone destruct unit (not shown, but like the unit 15 in FIGURE 1 only typically having a smaller size), and then to the oxygen recovery and/or atmosphere exhau ⁇ t 16.
  • the ozone destruct unit can be eliminated completely.
  • waste liquid stream in conduit 28 which is used to scrub the gas ⁇ trea in ⁇ crubber 20 ha ⁇ dissolved organic material, at least a significant portion, and often the majority, of residual ozone is destroyed during the scrubbing action, reacting with the dissolved organic material in the waste liquor ⁇ tream.
  • the residual ozone which does react with the dis ⁇ olved ⁇ olid material in the filtrate will partially oxidize the di ⁇ olved material, and reduce the COD if the filtrate is ⁇ ub ⁇ equently relea ⁇ ed to the environment.
  • the system of FIGURE 2 minimizes (or even eliminates) the need for the thermal or catalytic ozone destruct system and performs the functions of scrubbing fibers from an exhaust gas stream of an ozone bleaching stage 10, and destroys the residual ozone therein, simultaneously, utilizing a liquid waste stream already existing in the mill.
  • the ozone and fibers are removed in an efficient and effective manner, and simultaneously the COD of a liquid waste stream is reduced.
  • the following table illu ⁇ trates the effectiveness of a waste stream having dis ⁇ olved organic material in destroying ozone.
  • the te ⁇ t ⁇ reported in the Table were done using an ozone generator connected to a mixer in which pulp was optionally mixed with the ozone for twenty four second ⁇ in each te ⁇ t, and then to another station in which a destructor liquid was optionally mixed with the ozone and, if present, pulp, and finally to an ozone residual meter.
  • sodium bisulfite (NaHSO,) equivalent of 6% S0 ?

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Treating Waste Gases (AREA)
  • Paper (AREA)

Abstract

Les effluents gazeux résultant de la phase de blanchiment à l'ozone d'une fabrique de pâte à papier sont traités de manière à détruire l'ozone dans les effluents gazeux et à éliminer simultanément les fibres (32) entraînées dans lesdits effluents gazeux, sans qu'il soit nécessaire de recourir à un système de destruction thermique de l'ozone. Les gaz sont passés dans un épurateur de type grille caténaire (20) ou venturi qui utilise comme liquide d'épuration un liquide alcalin (28) contenant des matériaux organiques dissous. Le liquide d'épuration est de préférence un flux de liquide usé issu d'une autre phase de blanchiment, telle qu'une phase Eo (29) ayant un pH égal ou supérieur à 9,0 ou un flux de liquide contenant du bisulfite issu d'une fabrique de pâte au bisulfite (29).
PCT/US1993/001144 1992-03-02 1993-02-10 Destruction d'ozone combinee a l'elimination des fibres dans une fabrique de pate a papier WO1993018226A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU36153/93A AU3615393A (en) 1992-03-02 1993-02-10 Combined ozone destruction and fiber scrubbing in paper pulp mills

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US84306692A 1992-03-02 1992-03-02
US843,066 1992-03-02

Publications (1)

Publication Number Publication Date
WO1993018226A1 true WO1993018226A1 (fr) 1993-09-16

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Family Applications (1)

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Country Status (3)

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CA (1) CA2107764A1 (fr)
WO (1) WO1993018226A1 (fr)
ZA (1) ZA931384B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996014464A1 (fr) * 1994-11-08 1996-05-17 Kvaerner Pulping Ab Traitement des odeurs de condensats malodorants a l'aide de gaz residuel contenant de l'ozone
WO1997006305A1 (fr) * 1995-08-07 1997-02-20 Beloit Technologies, Inc. Procede de retraitement d'un gaz contenant de l'ozone, existant dans une installation de blanchiment de pate a papier
US5695604A (en) * 1996-08-05 1997-12-09 Beloit Technologies, Inc. Method for reprocessing an ozone-containing gas present in a pulp bleaching plant
EP0971066A1 (fr) * 1992-09-15 2000-01-12 Air Liquide Canada Inc. Récupération de gaz riche en oxygène provenant de procédés de blanchiment avec ozone
EP1149946A1 (fr) * 2000-04-28 2001-10-31 Praxair Technology, Inc. Traitement des condensats d'une fabrique de pâte à papier avec de l'ozone
WO2002025008A1 (fr) * 2000-09-22 2002-03-28 Metso Paper Inc. Procede et systeme de blanchiment de pate avec de l'ozone dans lesquels un gaz riche en oxygene est recycle
US7014684B2 (en) * 2000-12-01 2006-03-21 Linde Aktiengesellschaft Method for the treatment of waste gas from a cellulose plant
WO2009087265A3 (fr) * 2008-01-08 2009-09-03 Andritz Oy Traitement d'un gaz contenant de l'ozone en liaison avec le blanchiment de pâte à papier
EP3970835A1 (fr) 2020-09-22 2022-03-23 SUEZ Groupe Épurateur d'ozone et procédé d'épuration d'ozone

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764464A (en) * 1970-06-22 1973-10-09 Mo Och Domsjoe Ab Process for preparing cellulose pulp by alkaline oxygen digestion of wood in the presence of alkali metal carbonate or bicarbonate
US4279649A (en) * 1978-06-16 1981-07-21 Nippon Telegraph And Telephone Public Corporation Electrical contact material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3764464A (en) * 1970-06-22 1973-10-09 Mo Och Domsjoe Ab Process for preparing cellulose pulp by alkaline oxygen digestion of wood in the presence of alkali metal carbonate or bicarbonate
US4279649A (en) * 1978-06-16 1981-07-21 Nippon Telegraph And Telephone Public Corporation Electrical contact material

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0971066A1 (fr) * 1992-09-15 2000-01-12 Air Liquide Canada Inc. Récupération de gaz riche en oxygène provenant de procédés de blanchiment avec ozone
WO1996014464A1 (fr) * 1994-11-08 1996-05-17 Kvaerner Pulping Ab Traitement des odeurs de condensats malodorants a l'aide de gaz residuel contenant de l'ozone
WO1997006305A1 (fr) * 1995-08-07 1997-02-20 Beloit Technologies, Inc. Procede de retraitement d'un gaz contenant de l'ozone, existant dans une installation de blanchiment de pate a papier
US5695604A (en) * 1996-08-05 1997-12-09 Beloit Technologies, Inc. Method for reprocessing an ozone-containing gas present in a pulp bleaching plant
EP1149946A1 (fr) * 2000-04-28 2001-10-31 Praxair Technology, Inc. Traitement des condensats d'une fabrique de pâte à papier avec de l'ozone
US6348129B1 (en) 2000-04-28 2002-02-19 Praxair Technology Inc Treatment of pulp mill condensate with ozone
WO2002025008A1 (fr) * 2000-09-22 2002-03-28 Metso Paper Inc. Procede et systeme de blanchiment de pate avec de l'ozone dans lesquels un gaz riche en oxygene est recycle
US7014684B2 (en) * 2000-12-01 2006-03-21 Linde Aktiengesellschaft Method for the treatment of waste gas from a cellulose plant
WO2009087265A3 (fr) * 2008-01-08 2009-09-03 Andritz Oy Traitement d'un gaz contenant de l'ozone en liaison avec le blanchiment de pâte à papier
EP3970835A1 (fr) 2020-09-22 2022-03-23 SUEZ Groupe Épurateur d'ozone et procédé d'épuration d'ozone
WO2022063807A1 (fr) 2020-09-22 2022-03-31 Suez Groupe Épurateur d'ozone et procédé de lavage à l'ozone

Also Published As

Publication number Publication date
CA2107764A1 (fr) 1993-09-16
ZA931384B (en) 1993-09-22

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