EP0446110A1 - Verfahren zur Herstellung von gebleichtem Zellstoff mit hoher Ausbeute - Google Patents

Verfahren zur Herstellung von gebleichtem Zellstoff mit hoher Ausbeute Download PDF

Info

Publication number: EP0446110A1
Authority: EP; European Patent Office
Prior art keywords: sodium; sulfite; reducing agent; amount; silicate
Prior art date: 1990-03-07
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.): Granted

Application number

EP19910400567

Other languages

English (en)

French (fr)

Other versions

EP0446110B1 (de

Inventor

Michel Devic

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.)

Arkema France SA

Original Assignee

Elf Atochem 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.)

1990-03-07

Filing date

1991-03-01

Publication date

1991-09-11

Family has litigation

First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9394633&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0446110(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

1991-03-01 Application filed by Elf Atochem SA filed Critical Elf Atochem SA

1991-09-11 Publication of EP0446110A1 publication Critical patent/EP0446110A1/de

1995-07-12 Application granted granted Critical

1995-07-12 Publication of EP0446110B1 publication Critical patent/EP0446110B1/de

2011-03-01 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims abstract description 26
MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 47
BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 22
238000004061 bleaching Methods 0.000 claims abstract description 22
239000003638 chemical reducing agent Substances 0.000 claims abstract description 22
238000011282 treatment Methods 0.000 claims abstract description 21
239000003352 sequestering agent Substances 0.000 claims abstract description 19
238000005406 washing Methods 0.000 claims abstract description 16
-1 sulphite ion Chemical class 0.000 claims abstract description 9
238000004519 manufacturing process Methods 0.000 claims abstract description 7
229910021645 metal ion Inorganic materials 0.000 claims abstract description 5
LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 claims abstract description 5
LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 20
RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 18
239000012279 sodium borohydride Substances 0.000 claims description 6
229910000033 sodium borohydride Inorganic materials 0.000 claims description 6
GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 claims description 5
RYYXDZDBXNUPOG-UHFFFAOYSA-N 4,5,6,7-tetrahydro-1,3-benzothiazole-2,6-diamine;dihydrochloride Chemical compound Cl.Cl.C1C(N)CCC2=C1SC(N)=N2 RYYXDZDBXNUPOG-UHFFFAOYSA-N 0.000 claims description 4
159000000000 sodium salts Chemical class 0.000 claims description 4
239000002253 acid Substances 0.000 claims description 3
235000019832 sodium triphosphate Nutrition 0.000 claims description 3
150000007513 acids Chemical class 0.000 claims description 2
SNXYIOIMZXSIDC-UHFFFAOYSA-A hexadecasodium;phosphonato phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O.[O-]P([O-])(=O)OP([O-])([O-])=O.[O-]P([O-])(=O)OP([O-])([O-])=O.[O-]P([O-])(=O)OP([O-])([O-])=O SNXYIOIMZXSIDC-UHFFFAOYSA-A 0.000 claims description 2
150000002978 peroxides Chemical class 0.000 claims description 2
JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims description 2
LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims 2
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 20
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 14
239000011734 sodium Substances 0.000 description 14
229910052708 sodium Inorganic materials 0.000 description 14
239000000243 solution Substances 0.000 description 11
239000003795 chemical substances by application Substances 0.000 description 10
239000004115 Sodium Silicate Substances 0.000 description 7
NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 7
229910052911 sodium silicate Inorganic materials 0.000 description 7
GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 5
DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 4
239000007864 aqueous solution Substances 0.000 description 4
XQIMLPCOVYNASM-UHFFFAOYSA-N borole Chemical compound B1C=CC=C1 XQIMLPCOVYNASM-UHFFFAOYSA-N 0.000 description 4
230000009916 joint effect Effects 0.000 description 4
239000011777 magnesium Substances 0.000 description 4
239000000203 mixture Substances 0.000 description 4
235000010265 sodium sulphite Nutrition 0.000 description 4
239000002023 wood Substances 0.000 description 4
FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
230000000052 comparative effect Effects 0.000 description 3
150000001875 compounds Chemical class 0.000 description 3
239000000463 material Substances 0.000 description 3
235000015927 pasta Nutrition 0.000 description 3
235000010267 sodium hydrogen sulphite Nutrition 0.000 description 3
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 2
101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 2
CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
229920001131 Pulp (paper) Polymers 0.000 description 2
229910006069 SO3H Inorganic materials 0.000 description 2
238000010790 dilution Methods 0.000 description 2
239000012895 dilution Substances 0.000 description 2
239000012978 lignocellulosic material Substances 0.000 description 2
239000007791 liquid phase Substances 0.000 description 2
229910052749 magnesium Inorganic materials 0.000 description 2
239000012071 phase Substances 0.000 description 2
238000003825 pressing Methods 0.000 description 2
238000004537 pulping Methods 0.000 description 2
NYYSPVRERVXMLJ-UHFFFAOYSA-N 4,4-difluorocyclohexan-1-one Chemical compound FC1(F)CCC(=O)CC1 NYYSPVRERVXMLJ-UHFFFAOYSA-N 0.000 description 1
KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical class OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
241001080024 Telles Species 0.000 description 1
240000008042 Zea mays Species 0.000 description 1
239000000654 additive Substances 0.000 description 1
230000015572 biosynthetic process Effects 0.000 description 1
230000008030 elimination Effects 0.000 description 1
238000003379 elimination reaction Methods 0.000 description 1
239000000835 fiber Substances 0.000 description 1
239000011121 hardwood Substances 0.000 description 1
229910052739 hydrogen Inorganic materials 0.000 description 1
239000001257 hydrogen Substances 0.000 description 1
150000002500 ions Chemical class 0.000 description 1
238000004900 laundering Methods 0.000 description 1
230000003902 lesion Effects 0.000 description 1
229910052943 magnesium sulfate Inorganic materials 0.000 description 1
235000019341 magnesium sulphate Nutrition 0.000 description 1
238000002360 preparation method Methods 0.000 description 1
229920006395 saturated elastomer Polymers 0.000 description 1
239000011122 softwood Substances 0.000 description 1
239000007787 solid Substances 0.000 description 1
239000000126 substance Substances 0.000 description 1
UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 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
- 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
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
- 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
- D21C9/1084—Bleaching ; Apparatus therefor with reducing 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Definitions

the present invention relates to a process for manufacturing high-yield bleached pasta.
High-yield pulps are produced by subjecting the starting lignocellulosic material, such as wood in the form of chips, to a mechanical action, whether or not combined with chemical and thermal actions.
High-yield pulps are of definite interest for the industry because they achieve a valid compromise between mechanical pulps and chemical pulps themselves.
high yield is meant a yield, weight of dough in the dry state relative to the weight of initial material in the dry state, generally equal to at least 85% and often even to 90%.
sodium silicate is brought into play in such quantity that it is the cause of multiple and serious drawbacks during the elaboration of the pulp and that of the paper, such as for example the formation of solid deposits on the equipment and on the lignocellulosic fiber, or the production of a rough touch paper. See, for example, C.W. KUTNEY, Pulp & Paper Canada, 86:12, (1985), 182-189.
the process of the present invention makes it possible to keep only one bleaching step using hydrogen peroxide in an alkaline medium, to eliminate the drawbacks due to sodium silicate, not to burden the economy of the operation. , while ensuring the bleached dough a degree of white and high mechanical qualities.
the quantity of a compound is, unless specified or evident, expressed in% by weight relative to the weight of dough in the dry state .
the sequestering agent is used at a rate of approximately 0.1% to 1%.
the amount of reducing agent used can vary depending on the nature thereof. It is generally between 0.1 and 5% in the case of thiourea dioxide or dithionite.
Sodium borohydride is used in an amount of about 0.01% to 0.5%.
This reducing agent is conveniently used in the form of an aqueous solution such as for example the solution containing 12% by weight of sodium borohydride marketed under the name of BOROL® by the company VENTRON Corporation.
the joint action of the sulfite and the reducing agent on the dough, the sulfite and the reducing agent being present together in contact with the dough, is exerted at a temperature of between approximately 20 ° C. and 200 ° C. It is preferably chosen to be between 60 ° C and 140 ° C. When the temperature is equal to or higher than 100 ° C, the joint action of the sulfite and the reducing agent is exerted under saturated steam pressure.
a sequestering agent in nature and in quantity as in the pretreatment, can sometimes be advantageously present with the sulfite and the reducing agent.
the original paste is first subjected to a treatment using 0.5% DTPA for 15 minutes at 90 ° C at a consistency equal to 10%, then is washed and then subjected to the joint action of 5% Na2SO3 and 1% BOROL® for 0.5 hour at 90 ° C at a consistency equal to 20%.
the paste thus resulting from the succession of operations of pretreatment using the sequestering agent of metal ions, washing and treatment with the sulfite of the reducing agent jointly, is washed and finally subjected to a bleaching treatment at using hydrogen peroxide in an alkaline medium for 5 hours at 60 ° C. at a consistency equal to 20% with 4% H2O2, 4% NaOH, 0.5% DTPA in the absence therefore of silicate.
the bleached pulp thus obtained has a degree of white equal to ISO 83.9 °.
Example 1 is repeated except that the bleaching treatment using hydrogen peroxide in an alkaline medium is carried out in the presence of 1% silicate.
the bleached pulp obtained has a white degree equal to 84.7%.
Example 1 is repeated except that the bleaching treatment using hydrogen peroxide in an alkaline medium is carried out in the presence of 2% of silicate in example 3, of 4% of silicate in example 4.
Example 1 is repeated, eliminating the treatment of the pulp with the sulphite and the reducing agent together and keeping only the pretreatment with the sequestering agent, the washing after said pretreatment and the bleaching treatment with peroxide. hydrogen in an alkaline medium.
Example 5 the silicate is absent in Example 5 and is present at a rate of 1%, in Example 6, 2% in Example 7, 4% in Example 8.
the dough has a degree of white equal, for example 5, to 76%, for example 6, to 78.2%, for example 7, to 80.3% and for example 8 to 82 , 5%.
the washed pulp is subjected to a first bleaching treatment with H2O2 in an alkaline medium in the absence of silicate, at 60 ° C. and at a consistency of 20% as in Example 1 but for 1.5 hours with 1.44% H2O2 and 1.3% NaOH then washing and finally a second bleaching treatment with H2O2 in an alkaline medium under the same conditions of temperature and consistency as the first but with 2.56% H2O2, 3.1% NaOH and 0.05% Mg.
the bleached pulp obtained has a degree of white equal to 82.5 ° ISO.

Landscapes

Life Sciences & Earth Sciences (AREA)
Engineering & Computer Science (AREA)
Wood Science & Technology (AREA)
Paper (AREA)
Inks, Pencil-Leads, Or Crayons (AREA)
Noodles (AREA)
Detergent Compositions (AREA)
Glass Compositions (AREA)
Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

EP91400567A 1990-03-07 1991-03-01 Verfahren zur Herstellung von gebleichtem Zellstoff mit hoher Ausbeute Expired - Lifetime EP0446110B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FR9003128A FR2659363B1 (fr)	1990-03-07	1990-03-07	Procede de preparation de pates a haut rendement blanchies.
FR9003128		1990-03-07

Publications (2)

Publication Number	Publication Date
EP0446110A1 true EP0446110A1 (de)	1991-09-11
EP0446110B1 EP0446110B1 (de)	1995-07-12

Family

ID=9394633

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP91400567A Expired - Lifetime EP0446110B1 (de)	1990-03-07	1991-03-01	Verfahren zur Herstellung von gebleichtem Zellstoff mit hoher Ausbeute

Country Status (13)

Country	Link
US (1)	US5143581A (de)
EP (1)	EP0446110B1 (de)
JP (1)	JPH0660474B2 (de)
AT (1)	ATE125013T1 (de)
AU (1)	AU641478B2 (de)
CA (1)	CA2037678C (de)
DE (1)	DE69111098T2 (de)
ES (1)	ES2074670T3 (de)
FI (1)	FI98840C (de)
FR (1)	FR2659363B1 (de)
NO (1)	NO178899C (de)
NZ (1)	NZ237310A (de)
PT (1)	PT96951B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0509905A1 (de) *	1991-04-17	1992-10-21	Elf Atochem S.A.	Verfahren zur Herstellung von gebleichtem Hochausbeutepapierzellstoff

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2639371B1 (fr) *	1988-11-24	1995-04-14	Atochem	Procede de blanchiment de pates desencrees
BE1004630A3 (fr) *	1990-10-17	1992-12-22	Interox Internat Sa	Procede pour la preservation des caracteristiques de resistance mecanique des pates a papier chimiques.
US6398908B1 (en)	1991-04-30	2002-06-04	Eka Nobel Ab	Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound
SE502667C2 (sv) *	1993-07-12	1995-12-04	Kvaerner Pulping Tech	Behandling av fibermaterial med komplexbildare före kokning
WO1997032077A1 (en) *	1996-02-27	1997-09-04	Tetra Laval Holding & Finance S.A.	Process for sanitizing post-consumer paper fibers and product formed therefrom
DE10064131C2 (de) *	2000-12-22	2003-03-27	Sca Hygiene Prod Gmbh	Vollgebleichter Sulfit-Zellstoff, Verfahren zu seiner Herstellung und daraus hergestellte Produkte
US7297225B2 (en) *	2004-06-22	2007-11-20	Georgia-Pacific Consumer Products Lp	Process for high temperature peroxide bleaching of pulp with cool discharge
US8138106B2 (en)	2005-09-30	2012-03-20	Rayonier Trs Holdings Inc.	Cellulosic fibers with odor control characteristics
US11591751B2 (en)	2019-09-17	2023-02-28	Gpcp Ip Holdings Llc	High efficiency fiber bleaching process
US12286751B2 (en)	2021-01-06	2025-04-29	Gpcp Ip Holdings Llc	Oxygen treatment of high kappa fibers
US12435469B2 (en)	2022-02-22	2025-10-07	Gpcp Ip Holdings Llc	High yield chemical pulping and bleaching process

Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0263040A1 (de) *	1986-09-23	1988-04-06	Elf Atochem S.A.	Verfahren zum Bleichen von Lignocellulose-Materialien
EP0293309A1 (de) *	1987-05-25	1988-11-30	Elf Atochem S.A.	Verfahren zur Herstellung von chemithermomechanischen Zellstoffen
EP0311356A1 (de) *	1987-10-05	1989-04-12	FMC Corporation	Verfahren zum Bleichen von mechanischer Pulpe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2613388B1 (fr) *	1987-04-02	1990-05-04	Atochem	Procede de blanchiment de pates
JPH0677245B2 (ja) *	1988-08-11	1994-09-28	株式会社日立製作所	キャッシュ制御方法および情報処理システム
KR102014127B1 (ko)	2012-03-26	2019-08-26	코닌클리케 필립스 엔.브이.	Ｈｄｒ 이미지 인코딩 및 디코딩을 위한 밝기 영역-기반 장치들 및 방법들

1990
- 1990-03-07 FR FR9003128A patent/FR2659363B1/fr not_active Expired - Fee Related
1991
- 1991-03-01 EP EP91400567A patent/EP0446110B1/de not_active Expired - Lifetime
- 1991-03-01 AT AT91400567T patent/ATE125013T1/de not_active IP Right Cessation
- 1991-03-01 DE DE69111098T patent/DE69111098T2/de not_active Expired - Fee Related
- 1991-03-01 ES ES91400567T patent/ES2074670T3/es not_active Expired - Lifetime
- 1991-03-05 NO NO910865A patent/NO178899C/no not_active IP Right Cessation
- 1991-03-05 NZ NZ237310A patent/NZ237310A/en unknown
- 1991-03-06 PT PT96951A patent/PT96951B/pt not_active IP Right Cessation
- 1991-03-06 FI FI911118A patent/FI98840C/fi active
- 1991-03-06 US US07/665,531 patent/US5143581A/en not_active Expired - Fee Related
- 1991-03-06 CA CA002037678A patent/CA2037678C/fr not_active Expired - Fee Related
- 1991-03-06 AU AU72668/91A patent/AU641478B2/en not_active Ceased
- 1991-03-07 JP JP3067978A patent/JPH0660474B2/ja not_active Expired - Lifetime

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0263040A1 (de) *	1986-09-23	1988-04-06	Elf Atochem S.A.	Verfahren zum Bleichen von Lignocellulose-Materialien
EP0293309A1 (de) *	1987-05-25	1988-11-30	Elf Atochem S.A.	Verfahren zur Herstellung von chemithermomechanischen Zellstoffen
EP0311356A1 (de) *	1987-10-05	1989-04-12	FMC Corporation	Verfahren zum Bleichen von mechanischer Pulpe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0509905A1 (de) *	1991-04-17	1992-10-21	Elf Atochem S.A.	Verfahren zur Herstellung von gebleichtem Hochausbeutepapierzellstoff
FR2675518A1 (fr) *	1991-04-17	1992-10-23	Atochem	Procede de preparation de pate a papier a haut rendement et blanchie, a partir de copeaux de bois.

Also Published As

Publication number	Publication date
FI98840B (fi)	1997-05-15
DE69111098D1 (de)	1995-08-17
CA2037678C (fr)	1999-11-16
JPH0660474B2 (ja)	1994-08-10
JPH04214491A (ja)	1992-08-05
AU641478B2 (en)	1993-09-23
US5143581A (en)	1992-09-01
FR2659363A1 (fr)	1991-09-13
NO178899C (no)	1996-06-26
PT96951B (pt)	1998-10-30
ATE125013T1 (de)	1995-07-15
FI98840C (fi)	1997-08-25
AU7266891A (en)	1991-09-12
FR2659363B1 (fr)	1996-04-19
FI911118A0 (fi)	1991-03-06
NZ237310A (en)	1993-07-27
CA2037678A1 (fr)	1991-09-08
EP0446110B1 (de)	1995-07-12
NO178899B (no)	1996-03-18
NO910865L (no)	1991-09-09
FI911118L (fi)	1991-09-08
PT96951A (pt)	1991-10-31
ES2074670T3 (es)	1995-09-16
DE69111098T2 (de)	1995-11-23
NO910865D0 (no)	1991-03-05

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EP0446110B1 (de)	1995-07-12	Verfahren zur Herstellung von gebleichtem Zellstoff mit hoher Ausbeute
CA2003587C (fr)	1999-09-28	Procede de blanchiment de pates desencrees
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EP0285530B1 (de)	1993-01-13	Verfahren zum Bleichen von Zellstoffen
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FR2622221A1 (fr)	1989-04-28	Procede de blanchiment de pates
FR2910027A1 (fr)	2008-06-20	Procede de blanchiment des pates papeteries chimiques par traitement final a l'ozone a haute temperature
BE1005800A3 (fr)	1994-02-01	Procede pour la delignification et le blanchiment d'une pate a papier chimique.
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BE656601A (de)	1964-12-31
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CH161573A (fr)	1933-05-15	Procédé de blanchiment.
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