WO1994017239A1 - Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent - Google Patents
Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent Download PDFInfo
- Publication number
- WO1994017239A1 WO1994017239A1 PCT/SE1994/000054 SE9400054W WO9417239A1 WO 1994017239 A1 WO1994017239 A1 WO 1994017239A1 SE 9400054 W SE9400054 W SE 9400054W WO 9417239 A1 WO9417239 A1 WO 9417239A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pulp
- peroxide
- acid
- bleaching
- acetic acid
- Prior art date
Links
Classifications
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/166—Bleaching ; Apparatus therefor with per compounds with peracids
-
- 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
- D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
-
- 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
- D21C9/1026—Other features in bleaching processes
- D21C9/1042—Use of chelating agents
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Definitions
- the present invention relates to a method of bleaching pulp of cellulosic fibre material without the use of chlorine when manufacturing chemical pulp, wherein the pulp entering is fed continuously in a bleaching line and is treated with a sequestering agent in the presence of at least one acid in order to adjust the pH to a value below 7 and is thereafter bleached in a sequence of several stages consisting of peroxide, one or more organic per-acids and peroxide.
- US-A-3,867, 246 corresponding to SE-B-405130 describes another bleaching process without the use of chlorine, including the sequence peroxide, peracetic acid and peroxide, the first peroxide stage being preceded by treatment with sequestering agent in the presence of an acid in order to adjust a low pH value.
- the acid used is generally sulphuric acid.
- peracetic acid has a strongly decomposing effect on the cellulose.
- the object of the present invention is to solve the drawback in bleaching pulp without the use of chlorine, using peracetic acid in combination with peroxide in the bleaching sequence PPaP preceded by treatment with a sequestering agent (Q) in the presence of an acid, so that a ready-bleached pulp is obtained that has acceptable viscosity and strength properties and a brightness of 85-90% ISO requested by the market.
- a sequestering agent Q
- the method according to the invention is characterised in that during the treatment with the sequestering agent the pulp is acidified with acetic acid.
- the pulp entering is preferably produced by means of a digestion process giving a low Kappa number, and is thereafter subjected to delignification with oxygen gas to that the pulp obtains a Kappa number of about 12 or less and a viscosity of at least about 1000 dm ⁇ /kg.
- the peroxide used is preferably hydrogen peroxide.
- the second bleaching stage following the first peroxide stage, is performed using performic acid, peracetic acid or perpropionic acid, preferably peracetic acid or a mixture of at least two of said per-acids.
- acetic acid is added in such an amount that the pH value is below 6, preferably below 5.
- the temperature during all bleaching stages should be 80°C or above, preferably 90°C.
- Each peroxide stage is suitably performed in alkaline solution.
- the peracetic acid stage is preferably performed in acid solution.
- Acetic acid and peracetic acid, or other suitable per- -acids are preferably manufactured on site.
- the consistency of the pulp during the various treatment stages is about 8-16%, preferably 9-11%.
- Pa-stage 1 Peracetic acid calculated as total H 2 0 2 , kg/BDMT 20 30 20 30
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6516930A JPH08505907A (en) | 1993-01-29 | 1994-01-26 | Chlorine-free bleaching method for pulp using acetic acid as acidifying agent |
AU59820/94A AU675291B2 (en) | 1993-01-29 | 1994-01-26 | Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent |
EP94905899A EP0681624A1 (en) | 1993-01-29 | 1994-01-26 | Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent |
BR9406193A BR9406193A (en) | 1993-01-29 | 1994-01-26 | Process for bleaching pulp of cellulosic fiber material without the use of chlorine |
NO952935A NO305763B1 (en) | 1993-01-29 | 1995-07-24 | Process of chlorine-free bleaching of pulp using acetic acid as an acidifying agent |
FI953589A FI111387B (en) | 1993-01-29 | 1995-07-27 | Method for chlorine-free bleaching of pulp with acetic acid as an acidifying agent |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9300277A SE501325E (en) | 1993-01-29 | 1993-01-29 | Process for chlorine-free bleaching of pulp, wherein the pulp is acidified with acetic acid in the treatment with complexing agents |
SE9300277-2 | 1993-01-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994017239A1 true WO1994017239A1 (en) | 1994-08-04 |
Family
ID=20388704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1994/000054 WO1994017239A1 (en) | 1993-01-29 | 1994-01-26 | Method for chlorine-free bleaching of pulp with acetic acid as acidifying agent |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0681624A1 (en) |
JP (1) | JPH08505907A (en) |
CN (1) | CN1117301A (en) |
AU (1) | AU675291B2 (en) |
BR (1) | BR9406193A (en) |
CA (1) | CA2154076A1 (en) |
FI (1) | FI111387B (en) |
NO (1) | NO305763B1 (en) |
SE (1) | SE501325E (en) |
WO (1) | WO1994017239A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1050642C (en) * | 1996-06-25 | 2000-03-22 | 华南理工大学 | Everyday production 30-150 ton high concentration paper pulp bleaching method by using hydrogen peroxide |
CN103726382B (en) * | 2013-12-31 | 2016-08-17 | 安徽泾县千年古宣宣纸有限公司 | A kind of pure straw Chinese art paper and chloride-free bleaching production process thereof |
EP3882380B1 (en) * | 2020-03-16 | 2022-04-27 | Re:NewCell AB | One stage method for acid metal removal and bleach |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3867246A (en) * | 1972-04-21 | 1975-02-18 | Degussa | Chlorine-free multiple step bleaching of cellulose |
DE2841013C2 (en) * | 1978-09-21 | 1984-06-07 | Degussa Ag, 6000 Frankfurt | Process for full bleaching of pulp |
EP0402335A2 (en) * | 1989-06-06 | 1990-12-12 | Eka Nobel Ab | Process for bleaching lignocellulose-containing pulps |
EP0512590A1 (en) * | 1991-04-30 | 1992-11-11 | Eka Nobel Ab | Process for bleaching of lignocellulose-containing material |
-
1993
- 1993-01-29 SE SE9300277A patent/SE501325E/en not_active IP Right Cessation
-
1994
- 1994-01-26 CA CA 2154076 patent/CA2154076A1/en not_active Abandoned
- 1994-01-26 WO PCT/SE1994/000054 patent/WO1994017239A1/en active IP Right Grant
- 1994-01-26 JP JP6516930A patent/JPH08505907A/en active Pending
- 1994-01-26 BR BR9406193A patent/BR9406193A/en not_active IP Right Cessation
- 1994-01-26 EP EP94905899A patent/EP0681624A1/en not_active Ceased
- 1994-01-26 CN CN 94191058 patent/CN1117301A/en active Pending
- 1994-01-26 AU AU59820/94A patent/AU675291B2/en not_active Expired - Fee Related
-
1995
- 1995-07-24 NO NO952935A patent/NO305763B1/en not_active IP Right Cessation
- 1995-07-27 FI FI953589A patent/FI111387B/en active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3867246A (en) * | 1972-04-21 | 1975-02-18 | Degussa | Chlorine-free multiple step bleaching of cellulose |
DE2841013C2 (en) * | 1978-09-21 | 1984-06-07 | Degussa Ag, 6000 Frankfurt | Process for full bleaching of pulp |
EP0402335A2 (en) * | 1989-06-06 | 1990-12-12 | Eka Nobel Ab | Process for bleaching lignocellulose-containing pulps |
EP0512590A1 (en) * | 1991-04-30 | 1992-11-11 | Eka Nobel Ab | Process for bleaching of lignocellulose-containing material |
Also Published As
Publication number | Publication date |
---|---|
CN1117301A (en) | 1996-02-21 |
CA2154076A1 (en) | 1994-08-04 |
SE501325E (en) | 1999-09-20 |
FI111387B (en) | 2003-07-15 |
NO952935L (en) | 1995-09-13 |
JPH08505907A (en) | 1996-06-25 |
SE501325C2 (en) | 1995-01-16 |
SE9300277D0 (en) | 1993-01-29 |
FI953589A0 (en) | 1995-07-27 |
NO952935D0 (en) | 1995-07-24 |
AU675291B2 (en) | 1997-01-30 |
BR9406193A (en) | 1996-01-09 |
NO305763B1 (en) | 1999-07-19 |
FI953589A (en) | 1995-07-27 |
AU5982094A (en) | 1994-08-15 |
EP0681624A1 (en) | 1995-11-15 |
SE9300277L (en) | 1994-07-30 |
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