FI20075503A0 - Process for making paper and using acid / alkali treatment in making paper - Google Patents

Process for making paper and using acid / alkali treatment in making paper

Info

Publication number
FI20075503A0
FI20075503A0 FI20075503A FI20075503A FI20075503A0 FI 20075503 A0 FI20075503 A0 FI 20075503A0 FI 20075503 A FI20075503 A FI 20075503A FI 20075503 A FI20075503 A FI 20075503A FI 20075503 A0 FI20075503 A0 FI 20075503A0
Authority
FI
Finland
Prior art keywords
acid
making paper
suspension
dewatering device
pulp suspension
Prior art date
Application number
FI20075503A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI20075503L (en
Inventor
Aila Weaver
Risto Vahteri
Original Assignee
Stora Enso Oyj
Linde Ag
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.)
Filing date
Publication date
Application filed by Stora Enso Oyj, Linde Ag filed Critical Stora Enso Oyj
Priority to FI20075503A priority Critical patent/FI20075503L/en
Publication of FI20075503A0 publication Critical patent/FI20075503A0/en
Priority to AT08760061T priority patent/ATE515593T1/en
Priority to EP08760061A priority patent/EP2176461B1/en
Priority to CA002691590A priority patent/CA2691590A1/en
Priority to PCT/EP2008/056463 priority patent/WO2009003770A1/en
Publication of FI20075503L publication Critical patent/FI20075503L/en

Links

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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/64—Alkaline 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
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
    • 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
    • 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
    • D21H23/76—Processes or apparatus for adding material to the pulp or to the paper characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect
    • 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
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the 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
    • D21C9/16—Bleaching ; Apparatus therefor with per 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
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

The invention relates to a process for making paper, wherein a pulp suspension, which comprises mechanical pulp, is thickened in a dewatering device and is thereafter diluted with water and pumped to a storage tank, then diluted again and made in to paper. According to the invention, the pulp suspension is subjected to an acid - base treatment after the dewatering device. The pH of the suspension is first reduced with a strong acid by 0.5 -4 pH units to a pH between 4 and 6 and then the pH of the suspension is increased with a weak base by 0.5 -3 units to a pH below 8. The invention also relates to the use of an acid - base treatment in a process for making paper, wherein a pulp suspension, which has been thickened in a dewatering device, is subjected to an acid - base treatment for improving the process and/or the product. The invention provides improvements in the brightness of the pulp suspension and/or reduces the need for bleaching agent. The invention also decreases the dissolution of calcium carbonate filler in the process.
FI20075503A 2007-07-03 2007-07-03 Method for making paper and use of acid/base treatment in paper making FI20075503L (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
FI20075503A FI20075503L (en) 2007-07-03 2007-07-03 Method for making paper and use of acid/base treatment in paper making
AT08760061T ATE515593T1 (en) 2007-07-03 2008-05-27 METHOD FOR PRODUCING PAPER AND USE OF ACID/BASE TREATMENT IN PAPER PRODUCTION
EP08760061A EP2176461B1 (en) 2007-07-03 2008-05-27 Process for making paper and use of an acid/base treatment in papermaking
CA002691590A CA2691590A1 (en) 2007-07-03 2008-05-27 Process for making paper and use of an acid/base treatment in papermaking
PCT/EP2008/056463 WO2009003770A1 (en) 2007-07-03 2008-05-27 Process for making paper and use of an acid/base treatment in papermaking

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20075503A FI20075503L (en) 2007-07-03 2007-07-03 Method for making paper and use of acid/base treatment in paper making

Publications (2)

Publication Number Publication Date
FI20075503A0 true FI20075503A0 (en) 2007-07-03
FI20075503L FI20075503L (en) 2008-06-19

Family

ID=38331591

Family Applications (1)

Application Number Title Priority Date Filing Date
FI20075503A FI20075503L (en) 2007-07-03 2007-07-03 Method for making paper and use of acid/base treatment in paper making

Country Status (5)

Country Link
EP (1) EP2176461B1 (en)
AT (1) ATE515593T1 (en)
CA (1) CA2691590A1 (en)
FI (1) FI20075503L (en)
WO (1) WO2009003770A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112013019042A2 (en) 2011-01-25 2018-07-10 Basf Se process to produce a semipaste for the production of paper products, and use of methanesulfonic acid.
US20120186762A1 (en) * 2011-01-25 2012-07-26 Basf Se Producing half-stuffs for the manufacture of papery articles
US20120186766A1 (en) * 2011-01-25 2012-07-26 Basf Se Manufacturing a papery article
CA2825337A1 (en) 2011-01-25 2012-08-02 Basf Se Manufacturing a papery article

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639206A (en) * 1969-07-29 1972-02-01 Continental Can Co Treatment of waste water from alkaline pulping processes
DE2752413C2 (en) * 1977-11-24 1979-03-29 J.M. Voith Gmbh, 7920 Heidenheim Process for hardening the water in waste paper processing and device for carrying out the process
DE3773204D1 (en) * 1986-12-22 1991-10-24 Aga Ab, Lidingoe, Se
SE461860B (en) * 1989-02-13 1990-04-02 Mo Och Domsjoe Ab PROCEDURES FOR PREPARING PAPER AND COATED PAPER WHICH BASED PAPER CONTAINS PRECIPATED CALCIUM CARBONATE
US5679220A (en) * 1995-01-19 1997-10-21 International Paper Company Process for enhanced deposition and retention of particulate filler on papermaking fibers
WO1997022749A1 (en) * 1995-12-19 1997-06-26 Kvaerner Hymac Inc. Process for treating refiner pulp
FI102911B1 (en) * 1997-06-13 1999-03-15 Aga Ab A method for stabilizing the pH of a pulp suspension and producing paper from the stabilized pulp
SE511794C2 (en) * 1997-06-30 1999-11-29 Sunds Defibrator Ind Ab Ways to reduce the content of calcium in the liquid phase in a pulp suspension
FI103520B (en) * 1998-03-03 1999-07-15 Upm Kymmene Corp Improved papermaking methods
KR100319491B1 (en) * 1998-12-08 2002-04-22 김충섭 Calcium hardness control method of recycled papermaking process water

Also Published As

Publication number Publication date
WO2009003770A1 (en) 2009-01-08
FI20075503L (en) 2008-06-19
ATE515593T1 (en) 2011-07-15
CA2691590A1 (en) 2009-01-08
EP2176461B1 (en) 2011-07-06
EP2176461A1 (en) 2010-04-21

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