EP0281273A1 - Pâte cellulosique - Google Patents

Pâte cellulosique Download PDF

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Publication number
EP0281273A1
EP0281273A1 EP88301311A EP88301311A EP0281273A1 EP 0281273 A1 EP0281273 A1 EP 0281273A1 EP 88301311 A EP88301311 A EP 88301311A EP 88301311 A EP88301311 A EP 88301311A EP 0281273 A1 EP0281273 A1 EP 0281273A1
Authority
EP
European Patent Office
Prior art keywords
pulp
paper
stream
carbon dioxide
gaseous carbon
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.)
Granted
Application number
EP88301311A
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German (de)
English (en)
Other versions
EP0281273B1 (fr
Inventor
George H. Hollerbach, Jr.
Walter Kleinberg
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.)
Linde LLC
Original Assignee
BOC Group Inc
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Filing date
Publication date
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Application filed by BOC Group Inc filed Critical BOC Group Inc
Priority to AT88301311T priority Critical patent/ATE91734T1/de
Publication of EP0281273A1 publication Critical patent/EP0281273A1/fr
Application granted granted Critical
Publication of EP0281273B1 publication Critical patent/EP0281273B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/08—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/65—Acid compounds

Definitions

  • This invention relates to the preparation of cellulosic pulps, and more particularly to the chemical treatment of alkaline cellulosic pulp prior to processing in a paper making assembly.
  • the digestion of cellulosic materials is primarily carried out utilizing either soda, sulfate, sulfite or neutral sulfite processes and is sometimes performed by batch methods, i.e., particulate cellulosic materials in relatively small pieces or chips and delignifying chemicals in aqueous solution are introduced into a pressure cooker or digester wherein the mixture is raised to delignifying temperatures and thereafter discharged as concentrated pulp and spent liquor for further processing operations.
  • Continuous methods are also known. Processing data for determining delignifying conditions, such as strength of the chemicals, time and temperature, are determined to a great extent from actual experience rather than from correlated laboratory data, since the severity of the chemical attack on the charged cellulosic materials varies considerably even within wood species.
  • the delignified cellulosic material from the digester is introduced into a blow tank for dilution with diluting liquors to a pumpable consistency of from 1.5 to 4 percent solids for the separation and recovery of the cooking chemicals and prior to refining and further treatment of the cellulosic pulp slurry for introduction to a paper making machine, such as a Fourdrinier machine.
  • sizing agents are employed to make papers resistant to penetration of certain liquids; clays and other pigments to improve brightness, opacity, and printing properties; starches and gums to improve fiber bonding and fiber distribution; various synthetic polymers to impart wet strength; dyes and colored pigments to give desired color; surface active agents to improve absorbency, combat self-sizing, and decrease foam and pitch troubles.
  • cellulosic pulp slurries are advantageously processed with such additives at a pH of from about 4.5 to 7.0.
  • Cellulosic pulps produced by alkaline pulping techniques are at a pH of from about 12.0 to 10.0 and require extensive chemical treatment, e.g., a first treatment with sulfuric acid, to bring the resulting cellulosic pulp into the appropriate pH range of from 9.5 to 7.5 for effective treatment with such hereinbefore described additives.
  • carbon dioxide is introduced in the gaseous phase into an alkaline cellulosic pulp under conditions to adjust and maintain at from about 8.5 to 6.5, the pH of the pulp stream prior to introduction into a pulp refiner.
  • a pH of greater than about 8.5 provides minimal benefits and a pH of less than about 6.5 requires excessive carbon dioxide.
  • a pH in the range 8.5 to 7.5 is preferred.
  • gaseous carbon dioxide is also introduced into the refined pulp under conditions to adjust and maintain at from about 7.0 to 5.5 the pH of the pulp stream prior to introduction into a paper making assembly.
  • a pH in the range of 6.0 to 5.5 is more preferred.
  • the invention makes possible the manufacture of paper of improved physical properties.
  • the invention also makes possible better pulp drainage thereby permitting paper forming with reduced energy requirements, for drying.
  • Other advantages that may be derived from the use of the invention include improved operation of the paper making machine, a reduction an rejected paper, and reduced requirements for certain chemical additives (e.g. alum or aluminium sulphate).
  • a paper making machine such as a Fourdrinier machine, generally indicated as 10 and including a headbox 12 for distributing paper-forming pulp stock onto the moving screen 36 of the Fourdrinier machine 10.
  • Cellulosic pulp material produced by standard alkaline pulping techniques are introduced into a blow tank (not shown), washed and stored in a chest 14 and combined with white water in line 16 to a pumpable consistency of about 1.5 to 5.0 percent, generally about 4 percent solids, and passed in line 18 to the suction side of a pump 20.
  • a pulp slurry in line 22 from the discharge side of the pump 20 is contacted with gaseous carbon dioxide from line 21 by an injection assembly 25 to form a combined stream in line 26.
  • Gaseous carbon dioxide is added in an amount sufficient to provide a pH of from about 8.5 to about 6.5, in the combined pulp stream which is passed through a refiner 28 to fibrilate the cellulosic pulp material.
  • the line 30 downstream from the refiner 28 contains a second injecting assembly 60 for contacting the refined pulp stream with additional gaseous carbon dioxide from line 21.
  • Gaseous carbon dioxide is added in an amount sufficient to provide a combined stream in downstream line 62 having a pH in the range from about 7.0 to 5.5.
  • the pulp from line 62 is mixed with white water in line 46 to a solids consistency of about 0.4 percent and passed through pump 32 and line 34 to a headbox 12.
  • a sizing precursor such as alum
  • the alum may be introduced as a liquid into line 30, line 46 or directly into the headbox 12 (as shown).
  • the pulp in headbox 12 is distributed onto the endless woven-wire belt 36 of the Fourdrinier machine 10.
  • a liquid (hereinabove referred to as "white water”) is drained from the cellulosic pulp sheet being formed, and the pulp sheet is dried and passed to further processing steps in the formation of finished paper, generally in the form of a roll.
  • the white water 40 drained from the cellulosic pulp during distribution on the endless woven-wire belt 36 is collected in a sump 38 of the Fourdrinier machine 10 and is passed to a mixing tank 42, called a wire pit, to which are added by line 44 other additive chemicals as required for manufacturing a specific paper product.
  • a purge stream of the white water is generally continually withdrawn through line 45 to maintain chemicals, such as sulfate ions, at certain predetermined levels in the recycling white water stream in line 46.
  • the gaseous carbon dioxide in line 21 is at a pressure of about 40 to 200 psig, and is preferably at a pressure of from 10 to 20 psi greater than the pressure of the cellulosic pulp in line 22.
  • the gaseous carbon dioxide injection assembly 25 is a porous metal sparger, preferably, in combination with a static mixer which provides good gas dispersion and maximum transfer efficiency. Suitable spargers and static mixers are commercially available from a number of manufacturers.
  • Proper addition of the gaseous carbon dioxide permits rapid and intimate mixing in the cellulosic pulp such that a uniform, predetermined resulting pH level is readily attained in line 26 at a point downstream of the discharge side of the pump 20 and prior to introduction into a subsequent unit operation, e.g., the refiner 28.
  • the pH of the treated pulp slurry is measured with a meter assembly 50 having a pH probe 52 in line 26.
  • a meter output is used to generate a feedback control signal to operate a valve 56 in line 21 to regulate the flow of carbon dioxide in line 24 to achieve the desired pH level in the pulp stream.
  • Line 24 also contains a check valve 27.
  • the second gaseous carbon dioxide injecting assembly 60 is a porous metal sparger; adequate mixing may be obtained without a second static mixer.
  • a second meter assembly 64 having a pH probe 66 in line 62 measures the pH and provides a control signal to operate a second valve 68 connected in line 70 between carbon dioxide line 21 and the second injecting assembly 60.
  • Line 70 also contains a check valve 72.
  • the pressure of carbon dioxide in line 21 is preferably at a pressure of from about 10 to 20 psig greater than the pressure of the refined pulp stream in line 30.
  • a concentrated pulp stream of a pH of 11.0 and a density of 15 percent solids produced by kraft processing of soft wood is diluted with white water to a consistency of 4 to 5 percent solids and a resulting pH of 10.5.
  • the diluted pulp stream is introduced into and passed (with trim dilution, as required) to the suction side of a pulp pump 20 at a rate of 2100 GPM.
  • gaseous carbon dioxide is added to the dilute pulp stream in the downstream conduit from the pulp pump.
  • gaseous carbon dioxide is added to the dilute pulp stream in the downstream conduit from the pulp pump. No carbon dioxide is added to the refined pulp stream.
  • Alum is added to the refined pulp stream at a rate of 10.4 pounds per minute.
  • the thus treated refined pulp stream is thereupon further diluted with white water to a solids content of 0.4 percent and a pH of about 4.5 before introduction into the headbox 12 of the Fourdrinier machine 10 for processing into paper.
  • the controlled introduction of carbon dioxide before the refining step results in stronger paper as a result of improved refining when compared to the introduction of sulfuric acid to adjust pH prior to the refining step.
  • dilute pulp streams of a solids content of about 4 to 5 percent solids are produced by kraft pulp processing from hard and soft woods.
  • a dilute soft wood pulp stream and a dilute hard wood pulp are combined to form a primary line pulp stream to be refined to form the dilute pulp stream to be diluted by white water to a solids content of about 0.4 percent for introduction into the primary headbox of the paper machine.
  • the dilute soft wood pulp stream having a solids content of 4 to 5 percent and a pH of 10.5 is passed (including trim white water) to the suction side of a pulp pump at a rate of 3000 GPM.
  • the resulting pulp stream at a pH of 7.0 is introduced into a primary refiner prior to being combined in a secondary refiner with a dilute hard wood pulp stream pH of 7.0.
  • the dilute hard wood pulp stream having a solids content of 4 to 5 percent and a pH of 10.5 is passed (including trim white water) to the suction side of a pulp pump at a rate of 900 GPM.
  • the combined pulp stream is further diluted with white water (recovered from the wire pit of the paper machine and acidified with sulfuric acid) to a solids content of 0.4 percent and a pH of about 4.5 before introduction into a primary headbox.
  • the top sheet for the paper board is produced from a dilute soft wood pulp stream of a solids content of 4 to 5 percent which is introduced (together with trim white water) into the suction side of a pulp pump at a rate of 650 GPM to form a dilute pulp stream having a solids content of 4 percent in the discharge conduit therefrom.
  • a pulp pump to form a dilute pulp stream having a solids content of 4 percent in the discharge conduit therefrom.
  • the thus refined pulp stream (pH 7.0) is withdrawn from the secondary refiner and mixed with white water (recovered from the wire pit of the paper machine and acidified with sulfuric acid) for dilution to a further diluted pulp stream of a solids content of 0.4 percent and a pH of about 4.5 before introduction into the primary headbox together with alum at the rate of 2.1 pounds per minute.
  • a concentrated pulp stream of pH of 11.0 and a density of 15 percent solids produced by kraft processing of soft wood and hard wood is diluted to a consistency of 4 to 5 percent solids and a resulting pH of 10.5.
  • the diluted pulp stream is introduced into and passed (with trim dilution, as required) to the suction side of a pulp pump 20 at a rate of 2000 GPM.
  • gaseous carbon dioxide is added to the dilute pulp stream in the downstream pipe 26 from the pulp pump, there is added gaseous carbon dioxide at a rate of 3.3 pounds per minute to form a dilute pulp stream having a pH of 8.0 when introduced into a refiner 28 for processing.
  • Additional gaseous carbon dioxide is added at a rate of 1.4 pounds per minute to the refined pulp in line 30 downstream from the refiner to form a combined stream in pipe 62 having a pH of 5.5.
  • Alum is added to the refined pulp stream at a rate of 6.7 pounds per minute.
  • the thus treated refined pulp stream is thereupon further diluted with white water to a solids content of 0.4 percent and a pH of about 5.0 before introduction into the headbox 12 of the Fourdrinier machine 10 for procesing into paper. No sulfuric acid is used.
  • the use of sulfuric acid is eliminated, and the amounts of gaseous carbon dioxide introduced into the raw and refined pulp stream are individually selected to obtain optimum operation of the refiner 28 and the paper making machine 10.
  • the pH of the pulp stream in line 26 before the refiner is preferably in the range from about 8.5 to about 7.5.
  • the pH of the white water 40 in the wire pit 42 of a paper making assembly is usually in the range 7.0 to 4.5, typically between 5.5 and 4.5, For this reason, the pH of the pulp stream in line 62 following the refiner is preferably in the range from about 6.0 to about 5.5.
  • the use of carbon dioxide to lower the pH of a combined stream to a value less than about 5.5 is usually uneconomical because increasing amounts of carbon dioxide are required.
  • gaseous carbon dioxide significantly reduces the build up of barium sulfate (barium is present in the cellulosic raw material) and concomitant scaling of the paper making assembly therewith, thereby reducing the frequency of "boil-out" protocols which temporarily shut down the paper-making line.
  • gaseous carbon dioxide in processing of recycled paper products has significantly improved the operation of the paper machines and associated equipment.

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  • Paper (AREA)
  • Treating Waste Gases (AREA)
  • Carbon And Carbon Compounds (AREA)
EP19880301311 1987-02-27 1988-02-17 Pâte cellulosique Expired - Lifetime EP0281273B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88301311T ATE91734T1 (de) 1987-02-27 1988-02-17 Zellstoff.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US1983187A 1987-02-27 1987-02-27
US14675188A 1988-01-21 1988-01-21
US19831 1988-02-04
US146751 1988-02-04

Publications (2)

Publication Number Publication Date
EP0281273A1 true EP0281273A1 (fr) 1988-09-07
EP0281273B1 EP0281273B1 (fr) 1993-07-21

Family

ID=26692661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880301311 Expired - Lifetime EP0281273B1 (fr) 1987-02-27 1988-02-17 Pâte cellulosique

Country Status (6)

Country Link
EP (1) EP0281273B1 (fr)
JP (1) JP2582838B2 (fr)
AU (1) AU1175188A (fr)
DE (1) DE3882395T2 (fr)
FI (1) FI880918A (fr)
NO (1) NO880763L (fr)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572304B1 (fr) * 1992-05-27 1997-11-12 Canadian Liquid Air Ltd L'air Liquide Canada Ltee Utilisation de dioxyde de carbone lors du collage neutre et alcalin
EP0884416A2 (fr) * 1997-06-10 1998-12-16 Praxair Technology, Inc. Procédé de fabrication de papier avec du dioxyde de carbone
WO1998056988A1 (fr) * 1997-06-13 1998-12-17 Aga Aktiebolag PROCEDE SERVANT A STABILISER LE pH D'UNE SUSPENSION DE PATE A PAPIER ET A FABRIQUER DU PAPIER A PARTIR DE CETTE PATE A PAPIER STABILISEE
WO1999024661A1 (fr) * 1997-11-05 1999-05-20 Aga Aktiebolag Procede permettant un meilleur drainage des pulpes cellulosiques
WO2000073576A1 (fr) * 1999-06-01 2000-12-07 Aga Aktiebolag Blanchiment de la lignine et procede de production de papier
EP1065314A1 (fr) * 1999-07-01 2001-01-03 Carboxyque Française Procédé de fabrication de produits papetiers
WO2001075221A1 (fr) * 2000-04-05 2001-10-11 Aga Ab Procédé de blanchiment d'une pâte lignocellulosique
US6540870B1 (en) 1998-03-03 2003-04-01 Aga Aktiebolag Process for substantially retarding dissolution of calcium carbonate in a papermaking system
US6540878B1 (en) 1999-02-08 2003-04-01 Aga Aktiebolag Stabilized filler, its production and use
WO2003050356A1 (fr) * 2001-12-12 2003-06-19 Linde Aktiengesellschaft Appareil et procede permettant d'agir sur l'alcalinite et le ph dans un processus industriel
FR2836938A1 (fr) * 2002-03-07 2003-09-12 Air Liquide Perfectionnement aux procedes de fabrication de produits papetiers par amelioration du comportement physico-chimique de la pate a papier
WO2004029359A1 (fr) * 2002-09-30 2004-04-08 L'air Liquide - Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procedes servant a modifier les proprietes electriques de compositions de fabrication de papier au moyen de dioxyde de carbone
WO2004113614A1 (fr) * 2003-06-18 2004-12-29 L'air Liquide - Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Addition regulee de co2 au niveau de la partie humide dans un procede de fabrication du papier
CN100396849C (zh) * 2003-06-18 2008-06-25 液体空气乔治洛德方法利用和研究的具有监督和管理委员会的有限公司 Co2在造纸工艺湿部中的受控添加
WO2009034056A1 (fr) * 2007-09-13 2009-03-19 Linde Aktiengesellschaft Retrait d'éléments collants d'une suspension de pâte à papier, réduction de composés de calcium dans les déchets et utilisation de dioxyde de carbone dans la fabrication du papier
EP2038479A1 (fr) * 2006-07-10 2009-03-25 Fibertus Oy Procédé permettant d'augmenter le volume d'un produit fibreux, produit fibreux et son utilisation
WO2010023224A1 (fr) * 2008-08-27 2010-03-04 Linde Aktiengesellschaft Procédé de préparation d’une solution tampon dans un processus de fabrication du papier
EP2082094B1 (fr) 2006-11-15 2015-10-21 Linde AG Procédé pour réduire l'incrustation dans l'industrie de la pâte a papier et du papier et utilisation du dioxyde de carbone pour celui-ci
CN110093800A (zh) * 2018-01-30 2019-08-06 广西科开成林科技有限公司 一种湿态机械活化高浓磨浆的方法
CN115552076A (zh) * 2020-03-31 2022-12-30 埃斯卡有限公司 纸板生产设备生产有色纸板的方法及该方法生产的有色纸板

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3485685B2 (ja) * 1995-08-04 2004-01-13 オリンパス株式会社 屈折率分布型単レンズ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE235821C (fr) * 1910-10-11
US1993265A (en) * 1933-02-28 1935-03-05 Merrimac Chemical Co Inc Manufacture of paper embodying alkaline earth metal carbonate fillers
US2114809A (en) * 1934-07-06 1938-04-19 West Virginia Pulp & Paper Com Method of producing sized papers
US3112242A (en) * 1960-05-10 1963-11-26 Int Paper Co Treating a wood pulp slurry with a water-soluble acid prior to addition of sizing materials thereto

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4930605A (fr) * 1972-07-20 1974-03-19

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE235821C (fr) * 1910-10-11
US1993265A (en) * 1933-02-28 1935-03-05 Merrimac Chemical Co Inc Manufacture of paper embodying alkaline earth metal carbonate fillers
US2114809A (en) * 1934-07-06 1938-04-19 West Virginia Pulp & Paper Com Method of producing sized papers
US3112242A (en) * 1960-05-10 1963-11-26 Int Paper Co Treating a wood pulp slurry with a water-soluble acid prior to addition of sizing materials thereto

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0572304B1 (fr) * 1992-05-27 1997-11-12 Canadian Liquid Air Ltd L'air Liquide Canada Ltee Utilisation de dioxyde de carbone lors du collage neutre et alcalin
KR100404803B1 (ko) * 1997-06-10 2004-03-24 프랙스에어 테크놀로지, 인코포레이티드 이산화탄소를혼입시키는제지방법
EP0884416A2 (fr) * 1997-06-10 1998-12-16 Praxair Technology, Inc. Procédé de fabrication de papier avec du dioxyde de carbone
US6200416B1 (en) 1997-06-10 2001-03-13 Praxair Technology, Inc. Recycled paper production process which incorporates carbon dioxide
EP0884416A3 (fr) * 1997-06-10 1999-11-03 Praxair Technology, Inc. Procédé de fabrication de papier avec du dioxyde de carbone
AU731377B2 (en) * 1997-06-13 2001-03-29 Aga Aktiebolag A process for stabilizing the pH of a pulp suspension and for producing paper from the stabilized pulp
US6991705B2 (en) * 1997-06-13 2006-01-31 Aga Aktiebolag Process for stabilizing the PH of a pulp suspension and for producing paper from the stabilized pulp
WO1998056988A1 (fr) * 1997-06-13 1998-12-17 Aga Aktiebolag PROCEDE SERVANT A STABILISER LE pH D'UNE SUSPENSION DE PATE A PAPIER ET A FABRIQUER DU PAPIER A PARTIR DE CETTE PATE A PAPIER STABILISEE
WO1999024661A1 (fr) * 1997-11-05 1999-05-20 Aga Aktiebolag Procede permettant un meilleur drainage des pulpes cellulosiques
US6589387B1 (en) 1997-11-05 2003-07-08 Aga Aktiebolag Process for improving the drainage of cellulosic pulps by adding carbon dioxide directly into the pulp
AU749576B2 (en) * 1997-11-05 2002-06-27 Aga Aktiebolag A process for improving the drainage of cellulosic pulps
US6623599B1 (en) 1998-03-03 2003-09-23 Aga Aktiebolag Process for producing a paper web having calcium carbonate filler by introducing carbon dioxide to the pulp
US6540870B1 (en) 1998-03-03 2003-04-01 Aga Aktiebolag Process for substantially retarding dissolution of calcium carbonate in a papermaking system
US6540878B1 (en) 1999-02-08 2003-04-01 Aga Aktiebolag Stabilized filler, its production and use
WO2000073576A1 (fr) * 1999-06-01 2000-12-07 Aga Aktiebolag Blanchiment de la lignine et procede de production de papier
US6679972B1 (en) 1999-06-01 2004-01-20 Aga Aktiebolag Process for the bleaching of a pulp suspension by separating calcium from lignin
FR2795753A1 (fr) * 1999-07-01 2001-01-05 Carboxyque Francaise Perfectionnement aux procedes de fabrication de produits papetiers en vue de l'incorporation dans lesdits produits de dechets papetiers necessitant un traitement basique
EP1065314A1 (fr) * 1999-07-01 2001-01-03 Carboxyque Française Procédé de fabrication de produits papetiers
WO2001075221A1 (fr) * 2000-04-05 2001-10-11 Aga Ab Procédé de blanchiment d'une pâte lignocellulosique
WO2003050356A1 (fr) * 2001-12-12 2003-06-19 Linde Aktiengesellschaft Appareil et procede permettant d'agir sur l'alcalinite et le ph dans un processus industriel
EP1953120A1 (fr) * 2001-12-12 2008-08-06 Linde Aktiengesellschaft Appareil et procédé de contrôle de l'alcalinité et du pH d'un processus industriel
AU2002350774B2 (en) * 2001-12-12 2008-03-13 Linde Aktiengesellschaft An apparatus and a method for controlling the alkalinity and pH of an industrial process
WO2003074788A3 (fr) * 2002-03-07 2003-12-18 Air Liquide Ameliorations apportees aux procedes de fabrication de produits en papier par amelioration du comportement physico-chimique de la pate a papier
FR2836938A1 (fr) * 2002-03-07 2003-09-12 Air Liquide Perfectionnement aux procedes de fabrication de produits papetiers par amelioration du comportement physico-chimique de la pate a papier
US7056419B2 (en) 2002-09-30 2006-06-06 American Air Liquide, Inc. Methods for modifying electrical properties of papermaking compositions using carbon dioxide
CN100342082C (zh) * 2002-09-30 2007-10-10 液体空气乔治洛德方法利用和研究的具有监督和管理委员会的有限公司 利用二氧化碳改善造纸组合物电性能的方法
WO2004029359A1 (fr) * 2002-09-30 2004-04-08 L'air Liquide - Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Procedes servant a modifier les proprietes electriques de compositions de fabrication de papier au moyen de dioxyde de carbone
WO2004113614A1 (fr) * 2003-06-18 2004-12-29 L'air Liquide - Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Addition regulee de co2 au niveau de la partie humide dans un procede de fabrication du papier
CN100396849C (zh) * 2003-06-18 2008-06-25 液体空气乔治洛德方法利用和研究的具有监督和管理委员会的有限公司 Co2在造纸工艺湿部中的受控添加
EP2038479A4 (fr) * 2006-07-10 2012-08-22 Fibertus Oy Procédé permettant d'augmenter le volume d'un produit fibreux, produit fibreux et son utilisation
EP2038479A1 (fr) * 2006-07-10 2009-03-25 Fibertus Oy Procédé permettant d'augmenter le volume d'un produit fibreux, produit fibreux et son utilisation
EP2082094B1 (fr) 2006-11-15 2015-10-21 Linde AG Procédé pour réduire l'incrustation dans l'industrie de la pâte a papier et du papier et utilisation du dioxyde de carbone pour celui-ci
EP2082094B2 (fr) † 2006-11-15 2019-01-09 Linde AG Procédé pour réduire l'incrustation dans l'industrie de la pâte a papier et du papier et utilisation du dioxyde de carbone pour celui-ci
WO2009034056A1 (fr) * 2007-09-13 2009-03-19 Linde Aktiengesellschaft Retrait d'éléments collants d'une suspension de pâte à papier, réduction de composés de calcium dans les déchets et utilisation de dioxyde de carbone dans la fabrication du papier
WO2010023224A1 (fr) * 2008-08-27 2010-03-04 Linde Aktiengesellschaft Procédé de préparation d’une solution tampon dans un processus de fabrication du papier
CN110093800A (zh) * 2018-01-30 2019-08-06 广西科开成林科技有限公司 一种湿态机械活化高浓磨浆的方法
CN115552076A (zh) * 2020-03-31 2022-12-30 埃斯卡有限公司 纸板生产设备生产有色纸板的方法及该方法生产的有色纸板
CN115552076B (zh) * 2020-03-31 2023-08-25 埃斯卡有限公司 纸板生产设备生产有色纸板的方法及该方法生产的有色纸板

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NO880763D0 (no) 1988-02-22
JPS6445887A (en) 1989-02-20
AU1175188A (en) 1988-09-01
EP0281273B1 (fr) 1993-07-21
FI880918A0 (fi) 1988-02-26
NO880763L (no) 1988-08-29
DE3882395T2 (de) 1993-12-02
DE3882395D1 (de) 1993-08-26
FI880918A (fi) 1988-08-28
JP2582838B2 (ja) 1997-02-19

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