CA1282911C - Procede pour la delignification de matieres cellulosiques - Google Patents

Procede pour la delignification de matieres cellulosiques

Info

Publication number: CA1282911C
Authority: CA; Canada
Prior art keywords: cooking; cellulosic materials; stage; materials; carried out
Prior art date: 1985-08-05
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

Application number

CA000515198A

Other languages

English (en)

French (fr)

Inventor

Josef S. Gratzl

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Solvay Chimie SA

Original Assignee

Interox SA

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.)

1985-08-05

Filing date

1986-08-01

Publication date

1991-04-16

1986-08-01 Application filed by Interox SA filed Critical Interox SA

1991-04-16 Application granted granted Critical

1991-04-16 Publication of CA1282911C publication Critical patent/CA1282911C/fr

2008-04-16 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims abstract description 53
230000008569 process Effects 0.000 title claims abstract description 28
239000012978 lignocellulosic material Substances 0.000 title 1
239000000463 material Substances 0.000 claims abstract description 47
MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 46
238000010411 cooking Methods 0.000 claims abstract description 39
239000002253 acid Substances 0.000 claims abstract description 19
239000002023 wood Substances 0.000 claims abstract description 19
239000003153 chemical reaction reagent Substances 0.000 claims abstract description 14
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
239000001301 oxygen Substances 0.000 claims abstract description 5
239000002655 kraft paper Substances 0.000 claims description 13
239000007864 aqueous solution Substances 0.000 claims description 10
150000002978 peroxides Chemical class 0.000 claims description 10
NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
239000011593 sulfur Substances 0.000 claims description 7
229910052717 sulfur Inorganic materials 0.000 claims description 7
UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
229910052739 hydrogen Inorganic materials 0.000 claims description 5
239000001257 hydrogen Substances 0.000 claims description 5
229910021645 metal ion Inorganic materials 0.000 claims description 3
239000011122 softwood Substances 0.000 claims description 3
239000008139 complexing agent Substances 0.000 claims 1
235000015927 pasta Nutrition 0.000 abstract description 6
239000012634 fragment Substances 0.000 abstract description 4
229920002678 cellulose Polymers 0.000 abstract description 3
239000001913 cellulose Substances 0.000 abstract description 3
238000004519 manufacturing process Methods 0.000 abstract description 2
238000002360 preparation method Methods 0.000 abstract description 2
150000003464 sulfur compounds Chemical class 0.000 abstract 1
238000012360 testing method Methods 0.000 description 38
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
235000013312 flour Nutrition 0.000 description 8
239000000126 substance Substances 0.000 description 8
239000000243 solution Substances 0.000 description 7
238000005406 washing Methods 0.000 description 7
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
238000005470 impregnation Methods 0.000 description 6
239000003513 alkali Substances 0.000 description 5
230000008901 benefit Effects 0.000 description 5
238000010438 heat treatment Methods 0.000 description 5
-1 peroxide compound Chemical class 0.000 description 5
241000196324 Embryophyta Species 0.000 description 4
VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 4
150000007513 acids Chemical class 0.000 description 4
239000000654 additive Substances 0.000 description 4
229910052784 alkaline earth metal Inorganic materials 0.000 description 4
238000006243 chemical reaction Methods 0.000 description 4
239000011777 magnesium Substances 0.000 description 4
229960003330 pentetic acid Drugs 0.000 description 4
239000000047 product Substances 0.000 description 4
OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
229910052791 calcium Inorganic materials 0.000 description 3
239000011575 calcium Substances 0.000 description 3
230000000694 effects Effects 0.000 description 3
229910052749 magnesium Inorganic materials 0.000 description 3
239000000123 paper Substances 0.000 description 3
230000009467 reduction Effects 0.000 description 3
239000000523 sample Substances 0.000 description 3
QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
235000008566 Pinus taeda Nutrition 0.000 description 2
241000218679 Pinus taeda Species 0.000 description 2
ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
229920001131 Pulp (paper) Polymers 0.000 description 2
LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
150000001342 alkaline earth metals Chemical class 0.000 description 2
239000003795 chemical substances by application Substances 0.000 description 2
150000001875 compounds Chemical class 0.000 description 2
229940090960 diethylenetriamine pentamethylene phosphonic acid Drugs 0.000 description 2
DUYCTCQXNHFCSJ-UHFFFAOYSA-N dtpmp Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCN(CP(O)(=O)O)CCN(CP(O)(O)=O)CP(O)(O)=O DUYCTCQXNHFCSJ-UHFFFAOYSA-N 0.000 description 2
ZXKXJHAOUFHNAS-UHFFFAOYSA-N fenfluramine hydrochloride Chemical compound [Cl-].CC[NH2+]C(C)CC1=CC=CC(C(F)(F)F)=C1 ZXKXJHAOUFHNAS-UHFFFAOYSA-N 0.000 description 2
239000011521 glass Substances 0.000 description 2
229910052751 metal Inorganic materials 0.000 description 2
239000002184 metal Substances 0.000 description 2
150000007522 mineralic acids Chemical class 0.000 description 2
239000000203 mixture Substances 0.000 description 2
239000007800 oxidant agent Substances 0.000 description 2
239000011591 potassium Substances 0.000 description 2
229910052700 potassium Inorganic materials 0.000 description 2
150000003839 salts Chemical class 0.000 description 2
238000002791 soaking Methods 0.000 description 2
239000011734 sodium Substances 0.000 description 2
229910052708 sodium Inorganic materials 0.000 description 2
229910001220 stainless steel Inorganic materials 0.000 description 2
239000010935 stainless steel Substances 0.000 description 2
230000002195 synergetic effect Effects 0.000 description 2
241000609240 Ambelania acida Species 0.000 description 1
235000017166 Bambusa arundinacea Nutrition 0.000 description 1
235000017491 Bambusa tulda Nutrition 0.000 description 1
KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
244000273256 Phragmites communis Species 0.000 description 1
235000014676 Phragmites communis Nutrition 0.000 description 1
244000082204 Phyllostachys viridis Species 0.000 description 1
235000015334 Phyllostachys viridis Nutrition 0.000 description 1
239000002202 Polyethylene glycol Substances 0.000 description 1
CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
239000004115 Sodium Silicate Substances 0.000 description 1
PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
230000003213 activating effect Effects 0.000 description 1
230000000996 additive effect Effects 0.000 description 1
229910021529 ammonia Inorganic materials 0.000 description 1
239000010905 bagasse Substances 0.000 description 1
239000011425 bamboo Substances 0.000 description 1
230000009286 beneficial effect Effects 0.000 description 1
235000019402 calcium peroxide Nutrition 0.000 description 1
GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
235000010261 calcium sulphite Nutrition 0.000 description 1
235000019577 caloric intake Nutrition 0.000 description 1
150000004649 carbonic acid derivatives Chemical class 0.000 description 1
235000013339 cereals Nutrition 0.000 description 1
239000003638 chemical reducing agent Substances 0.000 description 1
239000011248 coating agent Substances 0.000 description 1
238000000576 coating method Methods 0.000 description 1
238000005260 corrosion Methods 0.000 description 1
238000000354 decomposition reaction Methods 0.000 description 1
238000013461 design Methods 0.000 description 1
VDQVEACBQKUUSU-UHFFFAOYSA-M disodium;sulfanide Chemical compound [Na+].[Na+].[SH-] VDQVEACBQKUUSU-UHFFFAOYSA-M 0.000 description 1
238000009826 distribution Methods 0.000 description 1
238000003912 environmental pollution Methods 0.000 description 1
238000000605 extraction Methods 0.000 description 1
239000011121 hardwood Substances 0.000 description 1
230000006872 improvement Effects 0.000 description 1
239000003112 inhibitor Substances 0.000 description 1
229910001853 inorganic hydroxide Inorganic materials 0.000 description 1
230000002045 lasting effect Effects 0.000 description 1
239000007788 liquid Substances 0.000 description 1
239000007791 liquid phase Substances 0.000 description 1
229910001425 magnesium ion Inorganic materials 0.000 description 1
159000000003 magnesium salts Chemical class 0.000 description 1
230000014759 maintenance of location Effects 0.000 description 1
238000005259 measurement Methods 0.000 description 1
150000002739 metals Chemical class 0.000 description 1
238000012986 modification Methods 0.000 description 1
230000004048 modification Effects 0.000 description 1
150000007524 organic acids Chemical class 0.000 description 1
235000005985 organic acids Nutrition 0.000 description 1
230000003647 oxidation Effects 0.000 description 1
238000007254 oxidation reaction Methods 0.000 description 1
230000001590 oxidative effect Effects 0.000 description 1
239000002245 particle Substances 0.000 description 1
238000005325 percolation Methods 0.000 description 1
229920001223 polyethylene glycol Polymers 0.000 description 1
229920001343 polytetrafluoroethylene Polymers 0.000 description 1
239000004810 polytetrafluoroethylene Substances 0.000 description 1
238000012545 processing Methods 0.000 description 1
239000002994 raw material Substances 0.000 description 1
230000035484 reaction time Effects 0.000 description 1
239000003352 sequestering agent Substances 0.000 description 1
238000004904 shortening Methods 0.000 description 1
235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
229910052911 sodium silicate Inorganic materials 0.000 description 1
229910052938 sodium sulfate Inorganic materials 0.000 description 1
229910052979 sodium sulfide Inorganic materials 0.000 description 1
235000011152 sodium sulphate Nutrition 0.000 description 1
239000002195 soluble material Substances 0.000 description 1
238000010561 standard procedure Methods 0.000 description 1
239000010902 straw Substances 0.000 description 1
235000011149 sulphuric acid Nutrition 0.000 description 1
239000013589 supplement Substances 0.000 description 1
239000004094 surface-active agent Substances 0.000 description 1
239000010875 treated wood Substances 0.000 description 1
239000012808 vapor phase Substances 0.000 description 1
235000013311 vegetables Nutrition 0.000 description 1
239000002699 waste material Substances 0.000 description 1
239000000080 wetting agent Substances 0.000 description 1

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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/26—Multistage processes

Landscapes

Polysaccharides And Polysaccharide Derivatives (AREA)
Paper (AREA)
Materials For Medical Uses (AREA)
Compositions Of Macromolecular Compounds (AREA)
Dental Preparations (AREA)
Diaphragms For Electromechanical Transducers (AREA)
Organic Insulating Materials (AREA)
Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Agricultural Chemicals And Associated Chemicals (AREA)
Detergent Compositions (AREA)
External Artificial Organs (AREA)
Ultra Sonic Daignosis Equipment (AREA)
Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Cleaning Or Drying Semiconductors (AREA)
Chemical Or Physical Treatment Of Fibers (AREA)

CA000515198A 1985-08-05 1986-08-01 Procede pour la delignification de matieres cellulosiques Expired - Lifetime CA1282911C (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
US76272485A	1985-08-05	1985-08-05
US762,724		1985-08-05

Publications (1)

Publication Number	Publication Date
CA1282911C true CA1282911C (fr)	1991-04-16

Family

ID=25065878

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA000515198A Expired - Lifetime CA1282911C (fr)	1985-08-05	1986-08-01	Procede pour la delignification de matieres cellulosiques

Country Status (14)

Country	Link
EP (1)	EP0213376B1 (de)
JP (1)	JPH0742669B2 (de)
AT (1)	ATE57401T1 (de)
AU (1)	AU591508B2 (de)
BR (1)	BR8603671A (de)
CA (1)	CA1282911C (de)
DE (1)	DE3674866D1 (de)
ES (1)	ES2000831A6 (de)
FI (1)	FI85725C (de)
IN (1)	IN167959B (de)
NO (1)	NO168375C (de)
NZ (1)	NZ217001A (de)
PT (1)	PT83117B (de)
YU (1)	YU45352B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
AU591509B2 (en) *	1985-08-05	1989-12-07	Interox Societe Anonyme	Process for the delignification of cellulosic substances
FI122654B (fi) *	1997-12-08	2012-05-15	Ovivo Luxembourg Sarl	Menetelmä paperisellumassan valmistamiseksi
AU2008253520B2 (en) *	2007-05-23	2013-05-09	Innotech Alberta Inc.	Method to remove hemicellulose from cellulosic fibres using a solution of ammonia and hydrogen peroxide

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE873649C (de) *	1944-08-25	1953-04-16	Degussa	Verfahren zur Herstellung von ungebleichten Zellstoffen mit hohem Weissgehalt
SE373896B (de) *	1972-07-05	1975-02-17	Mo Och Domsjoe Ab
SE380298B (sv) *	1974-03-14	1975-11-03	Mo	Forfarande for delignifiering genom syrgas-alkalibehandling av lignocelluosahaltigt material
US4486267A (en) *	1983-11-14	1984-12-04	Mead Corporation	Chemithermomechanical pulping process employing separate alkali and sulfite treatments
AU591509B2 (en) *	1985-08-05	1989-12-07	Interox Societe Anonyme	Process for the delignification of cellulosic substances

1986
- 1986-07-18 IN IN647/DEL/86A patent/IN167959B/en unknown
- 1986-07-25 EP EP86110249A patent/EP0213376B1/de not_active Expired - Lifetime
- 1986-07-25 DE DE8686110249T patent/DE3674866D1/de not_active Expired - Fee Related
- 1986-07-25 AU AU60543/86A patent/AU591508B2/en not_active Ceased
- 1986-07-25 AT AT86110249T patent/ATE57401T1/de not_active IP Right Cessation
- 1986-07-28 NZ NZ217001A patent/NZ217001A/xx unknown
- 1986-07-31 YU YU1370/86A patent/YU45352B/xx unknown
- 1986-08-01 CA CA000515198A patent/CA1282911C/fr not_active Expired - Lifetime
- 1986-08-01 PT PT83117A patent/PT83117B/pt not_active IP Right Cessation
- 1986-08-04 BR BR8603671A patent/BR8603671A/pt not_active IP Right Cessation
- 1986-08-04 ES ES868600839A patent/ES2000831A6/es not_active Expired
- 1986-08-04 NO NO863132A patent/NO168375C/no not_active IP Right Cessation
- 1986-08-04 JP JP61183261A patent/JPH0742669B2/ja not_active Expired - Lifetime
- 1986-08-05 FI FI863193A patent/FI85725C/fi not_active IP Right Cessation

Also Published As

Publication number	Publication date
ATE57401T1 (de)	1990-10-15
EP0213376B1 (de)	1990-10-10
FI863193L (fi)	1987-02-06
PT83117B (pt)	1988-10-14
NO168375C (no)	1992-02-12
YU137086A (en)	1987-10-31
IN167959B (de)	1991-01-12
FI863193A0 (fi)	1986-08-05
JPS6297991A (ja)	1987-05-07
NZ217001A (en)	1989-01-27
BR8603671A (pt)	1987-03-10
JPH0742669B2 (ja)	1995-05-10
PT83117A (fr)	1986-09-01
FI85725B (fi)	1992-02-14
DE3674866D1 (de)	1990-11-15
EP0213376A1 (de)	1987-03-11
AU591508B2 (en)	1989-12-07
NO863132L (no)	1987-02-06
FI85725C (fi)	1992-05-25
ES2000831A6 (es)	1988-03-16
AU6054386A (en)	1987-02-12
NO863132D0 (no)	1986-08-04
NO168375B (no)	1991-11-04
YU45352B (en)	1992-05-28

Legal Events

Date	Code	Title	Description
2003-04-16	MKLA	Lapsed

Publication	Publication Date	Title
EP0019963B1 (de)	1982-12-15	Verfahren zur Delignifizierung und zum Bleichen von chemischen und halbchemischen Zellstoffen
EP0578305B1 (de)	1998-03-04	Verfahren zur Delignifizierung von chemischen Zellstoffen
EP1322814B8 (de)	2011-05-25	Verfahren zum bleichen von zellstoff
EP0578304B1 (de)	1996-09-18	Verfahren zum Bleichen eines chemischen Zellstoffs
EP2761081B1 (de)	2018-08-08	Enzymatische vorbehandlung von holz in einem verfahren zur herstellung von mechanischem papierzellstoff
EP0165867A1 (de)	1985-12-27	Verfahren zum Bleichen von mechanischer Pulpe mittels Wasserstoffperoxid
EP0509905B1 (de)	1996-07-10	Verfahren zur Herstellung von gebleichtem Hochausbeutepapierzellstoff
JP2012506501A (ja)	2012-03-15	製紙用パルプの製造方法
CA1282911C (fr)	1991-04-16	Procede pour la delignification de matieres cellulosiques
BE1004674A3 (fr)	1993-01-12	Procede pour le blanchiment d'une pate a papier chimique et application de ce procede au blanchiment d'une pate kraft.
US4826568A (en)	1989-05-02	Process for delignification of cellulosic substances by pretreating with a complexing agent followed by peroxide prior to kraft digestion
EP0801170A1 (de)	1997-10-15	Verfahren zur Delignifizierung und/oder Bleichen eines Papierzellstoffs
EP0351330A1 (de)	1990-01-17	Verfahren zur Herstellung von gebleichten chemithermomechanischen Zellstoffen
EP0212329B1 (de)	1990-10-10	Verfahren zur Delignifizierung von Zellulosematerialien
EP0587822B1 (de)	1995-08-30	Verfahren zum bleichen und zur delignifizierung von chemischen papierzellstoffen
BE1005800A3 (fr)	1994-02-01	Procede pour la delignification et le blanchiment d'une pate a papier chimique.
EP0190723A1 (de)	1986-08-13	Verfahren zur Verbesserung der mechanischen Eigenschaften einer chemischen oder halbchemischen Papierpulpe aus Bagasse
EP0726979B1 (de)	1998-05-13	Verfahren zum bleichen von zellstoff
EP0728238B2 (de)	2004-08-11	Verfahren zum bleichen von zellstoff
FI71780C (fi)	1987-02-09	Kokningsfoerfarande foer lignosellulosamaterial i och foer framstaellning av pappersmassa.
BE1005094A3 (fr)	1993-04-20	Procede pour la preservation des caracteristiques de resistance mecanique des pates a papier chimiques et application de ce procede au blanchiment et a la delignification des pates kraft.
BE656601A (de)	1964-12-31
CH645146A5 (fr)	1984-09-14	Procede pour la fabrication de pate papetiere chimique et pate ainsi obtenue.
CZ297592A3 (en)	1993-07-14	Method of improving lignin splitting selectivity of a paper pulp
EP0874082A1 (de)	1998-10-28	Kontinuierliches Verfahren zur Delignifizierung und/oder Bleiche von unbearbeitem oder wiederverwendetem Zellstoff