CA1334581C - Procedure for bleaching cellulose pulp involving the use of combined enzyme treatment and a bleaching process employing chlorine chemicals - Google Patents
Procedure for bleaching cellulose pulp involving the use of combined enzyme treatment and a bleaching process employing chlorine chemicalsInfo
- Publication number
- CA1334581C CA1334581C CA000593523A CA593523A CA1334581C CA 1334581 C CA1334581 C CA 1334581C CA 000593523 A CA000593523 A CA 000593523A CA 593523 A CA593523 A CA 593523A CA 1334581 C CA1334581 C CA 1334581C
- Authority
- CA
- Canada
- Prior art keywords
- pulp
- bleaching
- enzyme
- chlorine
- bleached
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
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
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
- D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Investigating Or Analysing Biological Materials (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Hard Magnetic Materials (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Detergent Compositions (AREA)
Abstract
The present invention concerns a procedure for bleaching cellulose pulp obtained from hardwood, wherein bleaching chemical containing chlorine is used. The essential feature of the invention is that the residual chlorine content of the bleached pulp is reduced by subjecting the pulp to enzyme treatment. With the enzyme especially the removal from the pulp of chlorine-binding extractive substances present in hardwood pulp is promoted. The invention furthermore concerns the use of enzyme towards lowering the residual chlorine content of bleached cellulose pulp made from hardwood. Such cellulose pulp is particularly contemplated which will be converted into foodstuff package cardboard or paper, which are commonly disposed of by burning. Lowered chlorine content reduces the risk of producing toxic dioxin at the incineration step.
Claims (9)
1. A method for reducing residual chlorine content in hardwood pulp that has been previously bleached using chlorine chemicals, wherein said pulp is subjected to enzyme treatment and chlorine chemical treatment during the bleaching process, and wherein said enzyme which is used is hemicellulase, cellulase, esterase or a mixture thereof.
2. Method according to claim 1, wherein the pulp is treated with said enzyme either before or after the bleaching treatment.
3. Method according to claim 1, wherein the enzyme treatment takes place within the temperature range 10 to 90°C
and at pH 3.0 to 7.5.
and at pH 3.0 to 7.5.
4. Method according to claim 3, wherein the temperature range is 40 to 70°C and the pH is 4.0 to 6Ø
5. Method according to any one of claims 1 to 4, wherein to unbleached pulp obtained by birch sulphate cooking is added said enzyme which is allowed to act, whereafter the pulp is subjected to bleaching comprising consecutive oxidizing and extracting steps, using for bleaching chemicals in the oxidizing steps chlorine gas, chlorine dioxide or a mixture thereof and in the extracting steps, sodium hydroxide.
6. Method according to claim 5, wherein the bleaching is a five-step chlorine bleaching.
7. Method according to claim 5, wherein the pulp obtained by birch sulphate cooking is bleached in consecutive oxidizing and extracting steps, using in the first step chlorine gas, chlorine dioxide or a mixture thereof and in the subsequent extracting step, sodium hydroxide, and wherein after bleaching to the pulp suspension thus obtained is added said enzyme, which is allowed to act for a predetermined time.
8. The use of enzyme for lowering the residual chlorine content of bleached cellulose pulp made from hardwood, the enzyme being hemicellulase, cellulase, esterase or a mixture thereof.
9. The use of enzyme according to claim 8, for lowering the residual chlorine content of bleached cellulose pulp that is going to be processed to become foodstuff package cardboard or paper.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI881192 | 1988-03-14 | ||
FI881192A FI81395B (en) | 1988-03-14 | 1988-03-14 | FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA. |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1334581C true CA1334581C (en) | 1995-02-28 |
Family
ID=8526077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000593523A Expired - Lifetime CA1334581C (en) | 1988-03-14 | 1989-03-13 | Procedure for bleaching cellulose pulp involving the use of combined enzyme treatment and a bleaching process employing chlorine chemicals |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0407421B1 (en) |
JP (1) | JPH03505758A (en) |
AT (1) | ATE135429T1 (en) |
AU (1) | AU626846B2 (en) |
BR (1) | BR8907314A (en) |
CA (1) | CA1334581C (en) |
DE (1) | DE68925967T2 (en) |
DK (1) | DK175185B1 (en) |
FI (1) | FI81395B (en) |
NO (1) | NO174722C (en) |
NZ (1) | NZ228308A (en) |
WO (1) | WO1989008738A1 (en) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5298405A (en) * | 1986-04-30 | 1994-03-29 | Alko Limited | Enzyme preparations with recombinantly-altered cellulose profiles and methods for their production |
FI90888B (en) * | 1989-02-14 | 1993-12-31 | Enso Gutzeit Oy | Method for bleaching cellulose pulp |
FI86896B (en) * | 1989-05-04 | 1992-07-15 | Enso Gutzeit Oy | FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA. |
DK420289D0 (en) * | 1989-08-25 | 1989-08-25 | Novo Nordisk As | METHOD OF TREATING LIGNOCELLULOSE PULP |
NZ235679A (en) * | 1989-10-18 | 1993-01-27 | Int Paper Co | Bleaching lignocellulosic pulp using (a) treatment with xylanase and (b) one or more chemical bleaching stages |
SE465320B (en) * | 1990-01-10 | 1991-08-26 | Korsnaes Ab | PREPARATIONS SUBMITTING ENZYMATIC DELIGNIFICATION ACTIVITY, MADE TO MAKE THE SAME AND APPLICATIONS THEREOF |
FI88315C (en) * | 1990-04-04 | 1993-04-26 | Enso Gutzeit Oy | FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA |
US5837515A (en) * | 1990-05-16 | 1998-11-17 | Alko-Yhtiot Oy | Enzyme preparations and methods for their production |
GB9018426D0 (en) * | 1990-08-22 | 1990-10-03 | Sandoz Ltd | Improvements in or relating to novel compounds |
NZ239500A (en) * | 1990-08-24 | 1993-08-26 | Novo Nordisk As | Xylanases obtained from bacillus pumilus and use in a lignocellulosic chemical pulping process |
DE4129739A1 (en) * | 1990-09-11 | 1992-03-12 | Sandoz Ag | Chlorine-free bleaching of paper pulp |
FI108800B (en) * | 1991-05-07 | 2002-03-28 | Iogen Corp | A method and apparatus for using an enzyme in the manufacture and bleaching of pulp |
US5498534A (en) * | 1992-03-25 | 1996-03-12 | The United States Of America As Represented By The Secretary Of Agriculture | Method of removing color from wood pulp using xylanase from streptomyces roseiscleroticus NRRL B-11019 |
US5369024A (en) * | 1992-03-25 | 1994-11-29 | The United States Of America As Represented By The Secretary Of Agriculture | Xylanase from streptomyces roseiscleroticus NRRL-11019 for removing color from kraft wood pulps |
US5935836A (en) * | 1994-07-29 | 1999-08-10 | Rohm Enzyme Finland Oy | Actinomadura xylanase sequences and methods of use |
US5871730A (en) * | 1994-07-29 | 1999-02-16 | Universite De Sherbrooke | Thermostable xylanase DNA, protein and methods of use |
US7816129B2 (en) | 1994-07-29 | 2010-10-19 | Ab Enzymes Gmbh | Production and secretion of proteins of bacterial origin in filamentous fungi |
US6300114B1 (en) | 1994-07-29 | 2001-10-09 | Rohm Enzyme Finland Oy | Sequences of xylanase and xylanase expression vectors |
AU2002229430A1 (en) | 2001-01-18 | 2002-07-30 | Iogen Bio-Products Corporation | Use of xylanase in pulp bleaching |
US7368036B2 (en) | 2002-03-06 | 2008-05-06 | Iogen Bio-Products Corporation | Xylanase treatment of chemical pulp |
CN104963206A (en) * | 2014-12-11 | 2015-10-07 | 华东理工常熟研究院有限公司 | Enzyme modified paper pulp fiber, wood-plastic composite material and preparation method thereof |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ216726A (en) * | 1985-07-15 | 1990-08-28 | Repligen Corp | Use of lignin-degrading enzymes from phanerochaete chrysosporium for treatment of wood pulp and e1 effluent |
ZA894239B (en) * | 1988-06-08 | 1990-03-28 | Int Paper Co | Enzymatic delignification of lignocellulosic material |
DE68914112T2 (en) * | 1988-11-23 | 1994-08-04 | Sandoz Ag | Use of enzymes from Aureobasidium pullulans for pulp bleaching. |
-
1988
- 1988-03-14 FI FI881192A patent/FI81395B/en not_active Application Discontinuation
-
1989
- 1989-03-13 BR BR898907314A patent/BR8907314A/en not_active IP Right Cessation
- 1989-03-13 JP JP1502856A patent/JPH03505758A/en active Pending
- 1989-03-13 NZ NZ228308A patent/NZ228308A/en unknown
- 1989-03-13 CA CA000593523A patent/CA1334581C/en not_active Expired - Lifetime
- 1989-03-13 AT AT89903748T patent/ATE135429T1/en active
- 1989-03-13 DE DE68925967T patent/DE68925967T2/en not_active Revoked
- 1989-03-13 AU AU32923/89A patent/AU626846B2/en not_active Ceased
- 1989-03-13 WO PCT/FI1989/000045 patent/WO1989008738A1/en not_active Application Discontinuation
- 1989-03-13 EP EP89903748A patent/EP0407421B1/en not_active Revoked
-
1990
- 1990-09-04 DK DK199002119A patent/DK175185B1/en not_active IP Right Cessation
- 1990-09-07 NO NO903913A patent/NO174722C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
NO903913L (en) | 1990-09-07 |
DK211990A (en) | 1990-11-07 |
DE68925967D1 (en) | 1996-04-18 |
NZ228308A (en) | 1990-06-26 |
FI881192A0 (en) | 1988-03-14 |
ATE135429T1 (en) | 1996-03-15 |
FI81395B (en) | 1990-06-29 |
AU626846B2 (en) | 1992-08-13 |
FI881192A (en) | 1989-09-15 |
JPH03505758A (en) | 1991-12-12 |
EP0407421A1 (en) | 1991-01-16 |
NO903913D0 (en) | 1990-09-07 |
NO174722C (en) | 1994-06-22 |
DK211990D0 (en) | 1990-09-04 |
DE68925967T2 (en) | 1996-09-12 |
WO1989008738A1 (en) | 1989-09-21 |
AU3292389A (en) | 1989-10-05 |
BR8907314A (en) | 1991-03-19 |
DK175185B1 (en) | 2004-06-28 |
EP0407421B1 (en) | 1996-03-13 |
NO174722B (en) | 1994-03-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKEX | Expiry |