EP0759105B1 - Procede de preparation de pates a papier chimiques delignifiees et blanchies - Google Patents
Procede de preparation de pates a papier chimiques delignifiees et blanchies Download PDFInfo
- Publication number
- EP0759105B1 EP0759105B1 EP95917403A EP95917403A EP0759105B1 EP 0759105 B1 EP0759105 B1 EP 0759105B1 EP 95917403 A EP95917403 A EP 95917403A EP 95917403 A EP95917403 A EP 95917403A EP 0759105 B1 EP0759105 B1 EP 0759105B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- treatment
- weight
- hydrogen peroxide
- pressure
- 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
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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
-
- 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 invention relates to a preparation process. delignified and bleached chemical pulp.
- the first steps are to perfect the delignification resulting from cooking. Steps The following are bleaching steps.
- the pasta should usually present a whiteness of at least 88-90 ° ISO and a kappa index very weak while retaining good properties mechanical, i.e. without significant degradation of cellulose. This deterioration is detectable by the measure of the viscosity of the dough or its degree polymerization (DP).
- DP degree polymerization
- the first significant steps are usually performed by treatments with Chlorine gas or Chlorine dioxide.
- This article shows in particular the powers of delignification and bleaching compared of a series of reagents like chlorine, chlorine dioxide, oxygen, ozone, hydrogen peroxide and indicates also the results generally obtained in terms of kappa index, whiteness and viscosity.
- oxygen alone has a capacity for delignification and not appreciably for bleaching.
- Its chlorine replacement factor (CRF) is 5 and its use results in a reduction of about half of the kappa index (17 from 35), the viscosity obtained being 980 dm 3 / kg (about 37 cps ) and the whiteness of ISO 34 °.
- the kappa index decreases by a little less than half (20 from 35), the viscosity obtained being 900 and more dm 3 / kg (about 30 cps, and the whiteness of 45 ° ISO; we obtain 91 ° ISO for a viscosity of around 600 and more dm 3 / kg.
- Treatment with hydrogen peroxide makes it possible to whiten only pulps whose kappa index is less than 5 and whose manganese content is less than or equal to 3 ppm. and whose consistency is at least 25% by weight of dry matter relative to the total weight of the dough.
- This treatment with H 2 O 2 is carried out at a claimed temperature between 50 and 140 ° C.
- This manganese content less than or equal to 3 p.p.m. is obtained by an acid pretreatment or a complexing or sequestering agent in an acid medium.
- the temperatures exemplified are 80, 90 and 120 ° C. At this temperature of 120 ° C does not correspond any indication of the pressure prevailing in the medium reactive.
- This pressure could be the pressure of saturated water vapor at the indicated temperature.
- Examples 18 to 21 of EP0578304A1 using a chemical paste of a consistency of 30% show that the DP decreases from 1180 at 1030 when the final whiteness increases from 89.8 to 92.6 ° ISO.
- Patent application EP0577157A2 describes a process for bleaching a dough having a consistency from 5 to 20%, with hydrogen peroxide in the medium alkaline, at a pressure below 25 bar and preferably less than 14 bars.
- patent application WO-A-93/14262 describes a method of bleaching of a dough according to which the dough, previously delignified, to a Kappa index less than 9.5, is pretreated with a complexing agent in the medium acid, then subjected to a bleaching step with hydrogen peroxide in presence of a silicate and at a temperature below 100 ° C. The pressure to whitening is not indicated.
- Patent application WO-A-79/00861 describes a method of bleaching of paper pulp according to which the pulp previously impregnated with chemicals undergoes treatment with hydrogen peroxide at a temperature between 100 and 150 ° C and at a differential pressure of 5 to 400 KPa of vapor containing less than 1% oxygen. This document does not state of the Kappa index of the paste before and after treatment.
- the object of the present invention is to provide a process for the preparation of chemical paper pulps delignified and bleached with a high DP, in using oxygen and hydrogen peroxide as oxidizing agents and performing all stages of process treatment in reaction media at pH basic.
- This process also aims to avoid any stage using a chlorinated derivative as for example chlorine or chlorine dioxide and avoid also any stage of treatment with other agents oxidants including ozone or peracids.
- This process makes it possible to prepare ECF pasta and TCF without using oxidizing agents other than oxygen and hydrogen peroxide.
- Oxygen treatment (a) or delignification oxygen is now widely used in the paper industry and in particular for the development of TCF and ECF pasta as indicated by example, article from “Van Lierop, B, Oxygen delignification, Workshop on Emerging Pulping and Chlorine-free Technology, RALEIGH N.C., March 1-4, 1993) ".
- step (a) of process according to the invention are those known and used in the paper industry.
- One or more stages of washing the dough can be added at the end of oxygen treatment in an alkaline pH medium.
- Oxygen treatment can also be carried out in several successive stages with oxygen, separated by washing steps.
- Complexing or sequestering treatment (b) according to the present invention is carried out by means of a complexing or sequestering agent for metals of transition, such as DTPA, (Sodium diethylenetriaminepentaacetate), EDTA (sodium ethylenediaminetetraacetate), the salts of phosphonic acids.
- DTPA Sodium diethylenetriaminepentaacetate
- EDTA sodium ethylenediaminetetraacetate
- the amount of complexing agent or sequestering agent is from 0.1% to 1% by weight relative to the dry matter contained in the dough. Preferably this amount is from 0.25 to 0.5%.
- the consistency of the dough is expressed in hundred by weight of dry matter relative to weight total dough.
- treatment b) is carried out in a medium having an alkaline pH.
- the pH of the dough during the salary b) is greater than 7 and less than or equal to 12.5.
- the pH in b) is from 8.5 to 9.5.
- the alkaline pH during the treatment in b) is obtained either by the residual alkalinity of the dough after oxygen treatment, either by the alkalinity of the agent complexing or sequestering, either by addition of a base, for example NaOH.
- the alkalinity residual pulp combined with that of DTPA allows to obtain a pH close to 9 without adding sodium hydroxide.
- the manganese content of the dough before treatment with hydrogen peroxide c) do not not more than 5 p.p.m. in weight relative to the weight of dry matter of this same paste.
- the processing temperature b) is generally from 20 to 100 ° C and the preferred temperature from 60 to 90 ° C.
- the duration of treatment b) is generally 1 30 minutes and preferably 5 to 15 minutes.
- the consistency of the dough during processing b) is generally 2 to 25% and the consistency preferred is 4 to 12%.
- the dough is washed with water. Washing is carried out according to known techniques in the paper industry with hot or cold water.
- the kappa index of the dough before treatment with hydrogen peroxide does not exceed 17.
- the method then allows, in a final step P, to obtain a delignified and very white paste can be used directly for papermaking.
- the pressure p is from 5 to 200 absolute bars. This pressure range makes it possible to observe an advantage over maintaining a high DP during carrying out the method according to the invention.
- the pressure p is from 25 to 50 bars absolute.
- the alkali metal silicate is sodium silicate.
- sodium silicate we prefer for convenience, use 0.5 at 10% by weight of a commercial solution at 38 ° Bé par relative to the weight of the dry matter, and better still 4 to 8% by weight of this solution.
- reaction temperature t is 110 ° C to 180 ° C.
- the preferred range of t is 130 ° C to 160 ° C.
- the dough during the treatment with hydrogen peroxide, has a consistency of 4 to 35% in weight of dry matter relative to the total weight of the wet dough.
- the process can be carried out effectively at low consistencies of about 4 to about 10% and the very fluid reaction medium, can be easily moved by pumping avoiding any clogging.
- the consistency is 10 to 20%. This range of consistency optimizes the process yield.
- the peroxide treatment of hydrogen lasts from 1 minute to 3 hours.
- the duration varies in reverse with the increase in temperature.
- the duration is from 15 minutes to 1 hour. These relatively short durations allow increasing the hourly production output of the delignified and bleached dough.
- the hydrogen peroxide is committed at a rate of 0.5 to 10% by weight compared to the weight of the dry matter of the dough.
- step c) of delignification and bleaching according to the invention is carried out continuously or discontinuously (batch) by means of the apparatus generally employed in the pulp and paper industry allowing the dough to be impregnated with the solution aqueous hydrogen peroxide and silicate sodium, at high pressure and temperature for the duration chosen. After this treatment c) the dough is decompressed, cooled and washed with water.
- batch bleaching of dough high consistency (20 to 30%) can be made from as follows:
- the dough is cold mixed with the peroxide hydrogen and sodium silicate and water so as to obtain the chosen consistency, then introduced into a stainless steel autoclave of so as to fill it as completely as possible. After closing the autoclave, a small amount of water is pumped until a pressure of ten bars then the temperature is brought to the chosen temperature for the selected time. During the temperature rise phase the expansion liquids cause an increase in pressure. This increase can be controlled by the flow a little bit of the liquid phase during heating.
- the continuous laundering of low consistency paste (8-10%) can be made from as follows:
- DTPA pretreated dough is washed and mixed with hydrogen peroxide silicate and water to have a consistency of 8 to 10% allowing the paste to be pumpable.
- the mixture is then introduced under pressure, by a high pressure pump in the reactor by through a heat exchanger which carries the mix at the selected temperature.
- a heat exchanger which carries the mix at the selected temperature.
- Ancillary devices such as heat exchangers heat and vapor recovery cyclones can be added to recover and enhance the heat and the pressure of the dough after bleaching.
- the preferred embodiment of the present invention provides a new basic OQ sequence -P, step P being new in itself.
- This preferred sequence has advantages techniques because in the techniques of the prior art there is necessary to perform complexation or sequestration of metals in an acid medium to be able bleach at high levels, hydrogen peroxide.
- Patent application EP578304A shows that treatment in an acidic medium at pH controlled is necessary before you can perform the final step with hydrogen peroxide. All examples of EP578304 report processing complexing at acid pH or acid washing at pH 5 before final bleaching.
- the preferred embodiment of this invention achieves excellent results in bleaching material without requiring an acidic medium to stage b) contrary to the general teaching of prior art.
- this preferred sequence allows eliminate the corrosion problems in acidic environment of steel fittings and reduces problems concerning the treatment of residual acids and salts for the respect of the environment.
- Step c) practiced according to the characteristics of the invention allows thanks to the implementation of a pressure p greater than water vapor pressure saturating to avoid any significant evaporation of liquid reagents.
- the method according to the present invention allows therefore to obtain delignification and laundering almost complete with chemical pulp after cooking in only 3 steps and using only agents inexpensive oxidants namely oxygen and peroxide hydrogen.
- Examples 1 to 46 which appear in the Tables I to X, were made from three industrial chemical pulps obtained by kraft cooking and oxygen treatment.
- the oxygen treatment of the pasta was performed according to standard conditions at 10% consistency, under an oxygen pressure of 3.5 bars, at a temperature of 95 ° C and for a period of 60 to 90 minutes depending on the nature of the wood.
- Comparative test 39 of table VIII, carried out at atmospheric pressure and at low temperature (90 ° C) leads to a much lower whiteness (79.2 ° ISO) than that obtained with the same quantities of reagents test 31 (ISO 88.6 °).
- Test 38 of Table VII performed at low temperature but at high pressure gives for the same quantities of reagents a better whiteness (81.9 ° ISO) but much lower than that obtained by conditions of the present invention (test 31 of the table VI, 150 ° C, 100 bar, 88.6 ° ISO).
- Table IX shows the tests carried out on KR softwood kraft pulp with very low initial whiteness 34.5 ° ISO.
- Test 44 shows that the conditions of the invention (temperature of 150 ° C., pressure of 100 bars, and 8% of silicate) make it possible to obtain a high whiteness (89.0 ° ISO), ie a gain of 54, 5 ° ISO and an almost complete delignification (kappa index equal to 1.2).
- Test 43 shows that with 4% H 2 O 2 a gain of 43.8 ° ISO is still obtained.
- Tests 23, 26 and 45 show that for the same paste, the efficiency of bleaching increases with temperature. At 170 ° C, a whiteness of ISO 88.3 ° is obtained in only 20 minutes of heating.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
- les pâtes Kraft ou au sulfate,
- les pâtes au sulfite ou au bisulfite,
- les pâtes semi-chimiques ou au sulfite neutre,
- les pâtes après cuisson avec un solvant comme, celles obtenues par le procédé ORGANOSOLV,
- les pâtes sulfites-Anthraquinone
- les pâtes "Superbatch"
- les bois de résineux comme les diverses espèces de pins et sapins,
- les bois de feuillus comme par exemple le bouleau, le peuplier, le hêtre et l'eucalyptus.
Nature de la pâte après cuisson et traitement à l'oxygène | pH de la Pâte | Consistance en % | Indice Kappa | DP | Blancheur °ISO |
Kraft Résineux (KR) | 9,4 | 27 | 13,1 | 1010 | 34,5 |
Kraft feuillus (KFI) | 8,7 | 31 | 9,2 | 1160 | 53,7 |
Kraft feuillus (KFII) | 9,6 | 28 | 7,4 | 1170 | 44,9 |
- Les essais 34 et 35 du tableau VI montrent que l'addition de magnésium (1 % de sulfate de magnésium) a un effet néfaste sur le tableau.
- Les essais 31 et 32 du tableau VI montrent que l'addition de soude (1 % de NaOH) a un effet néfaste de blancheur.
- L'essai 36 du tableau VII et l'essai 46 du tableau X montrent que l'addition d'une quantité supplémentaire de DTPA pendant l'étape b) de l'action de H2O2, améliore très faiblement la blancheur.
L'essai 44 montre que les conditions de l'invention (température de 150°C, pression de 100 bars, et 8 % de silicate) permettent d'obtenir une forte blancheur (89,0° ISO) soit un gain de 54,5° ISO et une délignification presque complète (indice kappa égal à 1,2). L'essai 43 montre qu'avec 4 % de H2O2 on obtient encore un gain de 43,8° ISO.
Claims (20)
- Procédé de préparation de pâte à papier chimique délignifiée et blanchie suivant lequel on soumet une pâte lignocellulosique obtenue par une cuisson à la séquence des traitements suivants :a) un traitement délignifiant par l'oxygène, suivib) d'un traitement par un agent complexant ou séquestrant des métaux de transition suivi d'un lavage, puisc) d'un traitement par le peroxyde d'hydrogène, en présence de silicate de métal alcalin caracterisé en ce que le traitement par le peroxyde d'hydrogène est effectué, à une température t supérieure à 100°C et à une pression p supérieure à 1,5 fois la pression de la vapeur d'eau saturante à la température t.
- Procédé suivant la revendication 1, caractérisé en ce que le traitement b) est effectué en un milieu ayant un pH alcalin.
- Procédé suivant la revendication 2, caractérisé en ce que le pH alcalin de la pâte pendant le traitement b) est supérieur à 7 et inférieur ou égal à 12,5.
- Procédé suivant la revendication 3, caractérisé en ce que le pH alcalin du traitement b) est de 8,5 à 9,5.
- Procédé suivant l'une des revendications 1 à 4, caractérisé en ce que l'agent complexant ou séquestrant est le DTPA.
- Procédé suivant l'une des revendications 1 à 5, caractérisé en ce que l'agent complexant ou séquestrant est engagé dans le traitement b) en une quantité de 0,1 à 1 % en poids par rapport au poids de matière sèche de la pâte ainsi traitée.
- Procédé suivant la revendication 6, caractérisé en ce que ladite quantité est de 0,25 à 0,5 %.
- Procédé suivant l'une des revendications 1 à 7, caractérisé en ce que la teneur en manganèse de la pâte avant traitement au peroxyde d'hydrogène ne dépasse pas 5 p.p.m. en poids par rapport au poids de matière sèche.
- Procédé suivant l'une des revendications 1 à 8, caractérisé en ce que la pression p est de 5 à 200 bars absolus.
- Procédé suivant la revendication 9, caractérisé en ce que la pression p est de 25 à 50 bars absolus.
- Procédé suivant l'une des revendications 1 à 10, caractérisé en ce que le silicate de métal alcalin est du silicate de sodium.
- Procédé suivant la revendications 11, caractérisé en ce que le silicate de sodium est ajouté sous la forme de 0,5 à 10% en poids d'une solution aqueuse à 38° Bé par rapport au poids de la matière sèche.
- Procédé suivant la revendication 12, caractérisé en ce que le poids de la solution aqueuse à 38°Bé est de 4 à 8% en poids par rapport au poids de la matière sèche.
- Procédé suivant l'une des revendications 1 à 13, caractérisé en ce que la température t est de 110°C à 180°C.
- Procédé suivant la revendication 14, caractérisé en ce que la température t est de 130°C à 160°C.
- Procédé suivant l'une des revendications 1 à 15, caractérisé en ce que la pâte, lors du traitement au peroxyde d'hydrogène, a une consistance de 4 à 35% en poids de matière sèche.
- Procédé suivant la revendication 16, caractérisé en ce que la consistance est de 10 à 20% en poids de matière sèche.
- Procédé suivant l'une des revendications 1 à 17, caractérisé en ce que le traitement au peroxyde d'hydrogène à une durée de 1 minute à 3 heures.
- Procédé suivant la revendication 18, caractérisé en ce que la durée est de 15 minutes à 1 heure.
- Procédé suivant l'une des revendications 1 à 19, caractérisé en ce que le peroxyde d'hydrogène est engagé à raison de 0,5 à 10% en poids par rapport au poids de la matière sèche.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9405815A FR2719854B1 (fr) | 1994-05-11 | 1994-05-11 | Procédé de préparation de pâtes à papier chimiques délignifiées et blanchies. |
FR9405815 | 1994-05-11 | ||
PCT/FR1995/000494 WO1995031599A1 (fr) | 1994-05-11 | 1995-04-14 | Procede de preparation de pates a papier chimiques delignifiees et blanchies |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0759105A1 EP0759105A1 (fr) | 1997-02-26 |
EP0759105B1 true EP0759105B1 (fr) | 1998-12-02 |
EP0759105B2 EP0759105B2 (fr) | 2001-10-10 |
Family
ID=9463129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95917403A Expired - Lifetime EP0759105B2 (fr) | 1994-05-11 | 1995-04-14 | Procede de preparation de pates a papier chimiques delignifiees et blanchies |
Country Status (10)
Country | Link |
---|---|
US (1) | US6019870A (fr) |
EP (1) | EP0759105B2 (fr) |
CN (1) | CN1065304C (fr) |
AU (1) | AU2348495A (fr) |
CA (1) | CA2189796C (fr) |
ES (1) | ES2126278T5 (fr) |
FI (1) | FI117394B (fr) |
FR (1) | FR2719854B1 (fr) |
NO (1) | NO320946B1 (fr) |
WO (1) | WO1995031599A1 (fr) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2747407B1 (fr) * | 1996-04-12 | 1998-05-07 | Atochem Elf Sa | Procede de delignification et de blanchiment de pates a papier chimiques |
SE0004438L (sv) * | 1999-12-02 | 2001-06-03 | Andritz Ahlstrom Inc | Miljövänlig fiberlinje för framställning av blekt kemimassa |
US7001484B2 (en) | 2000-05-04 | 2006-02-21 | University Of New Brunswick | Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent |
WO2001083881A2 (fr) * | 2000-05-04 | 2001-11-08 | University Of New Brunswick | Blanchiment au peroxyde de pate a bois |
US20050087315A1 (en) * | 2003-10-28 | 2005-04-28 | Donovan Joseph R. | Low consistency oxygen delignification process |
WO2009154898A1 (fr) | 2008-06-20 | 2009-12-23 | International Paper Company | Composition et feuille d'impression présentant des propriétés optiques améliorées |
CN102926254B (zh) * | 2012-11-18 | 2018-02-27 | 天津容业达科技发展有限公司 | 常压低温清洁制浆过程中添加的制浆助剂 |
US9365525B2 (en) | 2013-02-11 | 2016-06-14 | American Science And Technology Corporation | System and method for extraction of chemicals from lignocellulosic materials |
CN104088187A (zh) * | 2014-06-05 | 2014-10-08 | 华南理工大学 | 一种纸浆漂白方法 |
US9382283B2 (en) | 2014-08-01 | 2016-07-05 | American Science And Technology Corporation | Oxygen assisted organosolv process, system and method for delignification of lignocellulosic materials and lignin recovery |
US9950858B2 (en) | 2015-01-16 | 2018-04-24 | R.J. Reynolds Tobacco Company | Tobacco-derived cellulose material and products formed thereof |
US11154087B2 (en) | 2016-02-02 | 2021-10-26 | R.J. Reynolds Tobacco Company | Method for preparing flavorful compounds isolated from black liquor and products incorporating the flavorful compounds |
US10196778B2 (en) | 2017-03-20 | 2019-02-05 | R.J. Reynolds Tobacco Company | Tobacco-derived nanocellulose material |
CN110644270B (zh) * | 2019-08-27 | 2022-01-07 | 齐鲁工业大学 | 一种杨木kp浆tcf漂白生产溶解浆的工艺 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0087553A1 (fr) * | 1982-02-27 | 1983-09-07 | Degussa Aktiengesellschaft | Procédé de fabrication de pâtes cellulosiques semi-blanchies |
WO1993014262A1 (fr) * | 1992-01-21 | 1993-07-22 | Sunds Defibrator Industries Aktiebolag | Blanchiment de pate chimique |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE422818B (sv) * | 1978-03-31 | 1982-03-29 | Modo Chemetrics Ab | Forfarande for foredling av allulosamassa genom blekning eller extrahering |
JPS5658086A (en) * | 1979-10-17 | 1981-05-20 | Kogyo Gijutsuin | Multistage bleaching method of pulps |
ATE97179T1 (de) * | 1989-06-06 | 1993-11-15 | Eka Nobel Ab | Verfahren zum bleichen von lignocellulose enthaltenden zellstoffen. |
ZA924351B (en) * | 1991-06-27 | 1993-03-31 | Ahlstroem Oy | Ozone bleaching process |
BE1006056A3 (fr) * | 1992-07-06 | 1994-05-03 | Solvay Interox | Procede pour le blanchiment d'une pate a papier chimique. |
-
1994
- 1994-05-11 FR FR9405815A patent/FR2719854B1/fr not_active Expired - Fee Related
-
1995
- 1995-04-14 EP EP95917403A patent/EP0759105B2/fr not_active Expired - Lifetime
- 1995-04-14 CA CA002189796A patent/CA2189796C/fr not_active Expired - Fee Related
- 1995-04-14 US US08/737,684 patent/US6019870A/en not_active Expired - Fee Related
- 1995-04-14 CN CN95192987A patent/CN1065304C/zh not_active Expired - Fee Related
- 1995-04-14 WO PCT/FR1995/000494 patent/WO1995031599A1/fr active IP Right Grant
- 1995-04-14 ES ES95917403T patent/ES2126278T5/es not_active Expired - Lifetime
- 1995-04-14 AU AU23484/95A patent/AU2348495A/en not_active Abandoned
-
1996
- 1996-10-31 NO NO19964609A patent/NO320946B1/no not_active IP Right Cessation
- 1996-11-08 FI FI964499A patent/FI117394B/fi not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0087553A1 (fr) * | 1982-02-27 | 1983-09-07 | Degussa Aktiengesellschaft | Procédé de fabrication de pâtes cellulosiques semi-blanchies |
WO1993014262A1 (fr) * | 1992-01-21 | 1993-07-22 | Sunds Defibrator Industries Aktiebolag | Blanchiment de pate chimique |
Also Published As
Publication number | Publication date |
---|---|
FR2719854A1 (fr) | 1995-11-17 |
EP0759105B2 (fr) | 2001-10-10 |
CA2189796C (fr) | 2000-08-22 |
EP0759105A1 (fr) | 1997-02-26 |
CA2189796A1 (fr) | 1995-11-23 |
CN1147841A (zh) | 1997-04-16 |
US6019870A (en) | 2000-02-01 |
CN1065304C (zh) | 2001-05-02 |
NO320946B1 (no) | 2006-02-20 |
AU2348495A (en) | 1995-12-05 |
WO1995031599A1 (fr) | 1995-11-23 |
FR2719854B1 (fr) | 1996-06-21 |
ES2126278T3 (es) | 1999-03-16 |
ES2126278T5 (es) | 2002-02-16 |
NO964609D0 (no) | 1996-10-31 |
FI964499A0 (fi) | 1996-11-08 |
FI964499A (fi) | 1996-11-08 |
FI117394B (fi) | 2006-09-29 |
NO964609L (no) | 1996-10-31 |
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