WO1987001402A1 - Procede de production de pate de cellulose - Google Patents

Procede de production de pate de cellulose Download PDF

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Publication number
WO1987001402A1
WO1987001402A1 PCT/SE1986/000389 SE8600389W WO8701402A1 WO 1987001402 A1 WO1987001402 A1 WO 1987001402A1 SE 8600389 W SE8600389 W SE 8600389W WO 8701402 A1 WO8701402 A1 WO 8701402A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure
pressure vessel
vessel
raw material
sodium carbonate
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.)
Ceased
Application number
PCT/SE1986/000389
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English (en)
Inventor
Punya B. Chaudhuri
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1987001402A1 publication Critical patent/WO1987001402A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/36—Explosive disintegration by sudden pressure reduction

Definitions

  • the invention relates to a method of producing cellulosic pulp for paper making comprising defibration of a fibrous raw material consisting of wood chips, straw, bagasse, reed or the like.
  • CTMP Complementary Metal-Thermo Mechanical Pulp
  • a major disadvantage of this process is the high electrical energy consumption, about 1.5-2 M h/t.
  • a considerable portion of the electric energy supplied to the system is not utilized but can be recovered in the form of steam. In modern plants this steam is used as a heat source for drying paper and for other purposes.
  • the purpose of the invention is to offer a new method which is particularly designed for using in the first place steam for defibration of chips or other fibrous raw material. Particularly there is an object to achieve a high yield and low energy consumption. Further there is an object to hinder discolouration of the fibrous raw material and at the same time to impart favourable properties to the pulp.
  • the fibrous raw material is impregnated by an aqueous solution of sodium carbonate, that the fibrous raw material impregnated by sodium carbonate is charged in a pressure vessel, that the material in the pressure vessel is acidified by supplying sulphur dioxide to the pressure vessel, said sulphur dioxide reacting with said sodium carbonate to form sodium sulphite and carbon dioxide, which reaction at least partly taking place in situ in the fibrous raw material, that the material in the pressure vessel thereafter for a short duration is heated by saturated steam at a pressure of 20-100 bar, which further stimulates said reaction, and that the material thereafter suddenly is discharged and caused to expand in a vessel at an essentially lower and essentially constant pressure.
  • This second pressure vessel is maintained at a pressure of between 5 and 6 bar.
  • the pressure drop from between 40 and 100 bar to between 5 and 6 bar is considerable. Due to the fact that the pressure in this subsequent pressure vessel is maintained at a considerably low pressure it will also be possible to use a reboiler for generating fresh steam at such a pressure (about 5 bar) that it can effectively be used in the subsequent paper making.
  • the steam thus is used twice, once for exploding the chips and thereafter for paper drying. Additionally, a fracture of the condensate can be used for impregnation of the chips.
  • the fibrous raw material usually chips
  • a steaming vessel 1 where surplus steam heats the chips (or corresponding fibrous raw material) and fills the fiberlumen with condensated steam which expels the entrapped air from the chips in a manner known per se.
  • the chips thus steamed is fed at uniform rate by a screw conveyor 2 and a rotary feeder 3 into a first pressure vessel or impregnating vessel 4.
  • the pressure in this impregnation vessel 4 is maintained at about 1-8 bar and at a temperature below the boiling point at the 5 prevailing pressure by means of steam from a subsequent second pressure vessel 5 via a first steam conduit 6.
  • Sodium carbonate in water solution is pumped into the impregnating vessel through a conduit 7.
  • the chips is continuously transported downwards in the impregnation vessel at such a rate that the duration of the chips in M ⁇ contact with the sodium carbonate solution will be maximized to 2 hours. Finally the impregnated chips is discharged through the valve 8 in the bottom cone.
  • a stirrer has been designated 9.
  • the impregnated material is transported through a conduit 10 to a 15 dewatering screen 11, where surplus liquor is removed.
  • the drained liquor is recirculated to the impregnation vessel through a conduit 14.
  • the chips impregnated with sodium carbonate is stored in a buffer bin 12, which is equipped with a discharge screw 13.
  • the impregnated chips is charged via said discharge screw and via a valve 15 into said 20 second pressure vessel 5, which is a high pressure vessel.
  • the filling of the pressure vessel 5 is performed at a very high rate.
  • instead of batchwise treatment of the impregnated chips in the pressure vessel 5 also continuous treatment under pressure can be conceived.
  • the valve 15 is closed and a bottom valve 16 remains closed under the treatment which follows hereafter.
  • the purpose of the injection of sulphur dioxide is multiple.
  • One purpose is to reduce the pH to a desired pH-value of between 8-12.
  • sulphur dioxide shall react with the sodium carbonate to form sodium sulphite according to the following reaction Na 2 C0- + S0_ * Na p S0 3 + C0 2*
  • the sul P hur dioxide therefore is supplied in a stoichiometric amount in relation to the sodium carbonate. Further, there is an object to form carbon dioxide
  • Still another object is to form the carbon dioxide in situ in the fibrous raw material in order further to enhance the explosion effect at the subsequent pressure reduction. 5
  • high pressure steam is injected into the vessel 5 from a steam accumulator 19 via a conduit 20 and a valve 21.
  • the high pressure steam has a pressure of between 35 and 80 bar. This pressure in combination with the pressure achieved 0 through the chemical reaction between sulphur dioxide and sodium * carbonate will bring about a resultant pressure in the vessel 5 of between 40 and 100 bar at the same time as the temperature is increased to those temperatures which prevail for saturated water vapour at these pressures, i.e. a temperature of between 235° and 5 300°C.
  • the pressure vessel 5 thus operates cyclically, each cycle consisting of filling the vessel 5 with impregnated fibrous raw 5 material, closing the valve 15, injecting sulphur dioxide through conduit 17, injecting steam through conduit 20, opening the valve 16 and discharging the contents to vessel 22, closing valve 16 and opening valve 15. This entire cycle is performed during a duration of time of between 1 and 3 minutes.
  • steam is supplied through conduit 6 to the impregnation vessel 4.
  • the steam released from the third pressure vessel 22 is fed to and is condensated in a reboiler 23, which generates saturated fresh steam 5 having a pressure of 4-5 bar.
  • the pulp from the third pressure vessel 22 is discharged via the conduit 24 and a valve 25 for continued treatment.
  • Fractions of the steam condensate, which can contain metanol and other higher alcohols can be reused via a conduit 26 for impregnating the chips in the impregnation vessel 24 together with the sodium carbonate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

Procédé de production de pâte de cellulose consistant à éliminer les fibres d'une matière première fibreuse composée de copeaux de bois, de paille, de bagasse, de joncs ou analogues. On imprègne la matière première fibreuse d'une solution aqueuse de carbonate de sodium, la matière première étant ensuite transférée à une enceinte pressurisée (5). On acidifie la matière se trouvant dans l'enceinte pressurisée (5) en envoyant de l'anhydride sulfureux dans l'enceinte pressurisée (5), qui réagit avec le carbonate de sodium pour créer du sulfite de sodium et du gaz carbonique, ladite réaction ayant lieu au moins partiellement sur place dans la matière première fibreuse. La matière se trouvant dans l'enceinte pressurisée (5) est ensuite chauffée pendant un court laps de temps par de la vapeur saturée à une pression de 20 à 100 bars, ce qui accélère ladite réaction. Ensuite on décharge rapidement la matière dont on provoque l'expansion dans une deuxième enceinte (22) à une pression substantiellement inférieure et essentiellement constante.
PCT/SE1986/000389 1985-09-03 1986-09-02 Procede de production de pate de cellulose Ceased WO1987001402A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8504083A SE455314B (sv) 1985-09-03 1985-09-03 Framstellning av cellulosamassa innefattande kemisk forbehandling och defibrering genom expansion
SE8504083-0 1985-09-03

Publications (1)

Publication Number Publication Date
WO1987001402A1 true WO1987001402A1 (fr) 1987-03-12

Family

ID=20361275

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1986/000389 Ceased WO1987001402A1 (fr) 1985-09-03 1986-09-02 Procede de production de pate de cellulose

Country Status (2)

Country Link
SE (1) SE455314B (fr)
WO (1) WO1987001402A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284585A3 (fr) * 1987-03-24 1991-04-17 Stake Technology Ltd. Procédé de fabrication de pâte papetière
EP0501059B1 (fr) * 1991-02-28 1995-11-29 Bohuslav Vaclav Kokta Procédé de lessivage par explosion à la vapeur pour faire du papier
US6413362B1 (en) 1999-11-24 2002-07-02 Kimberly-Clark Worldwide, Inc. Method of steam treating low yield papermaking fibers to produce a permanent curl
US6506282B2 (en) 1998-12-30 2003-01-14 Kimberly-Clark Worldwide, Inc. Steam explosion treatment with addition of chemicals
EP1571255A1 (fr) * 2004-03-03 2005-09-07 SCA Hygiene Products GmbH Dispositif et procédé de réduction de la perte de vapeur dans un système fermé
EP2336344A1 (fr) * 2009-12-21 2011-06-22 Sekab E-Technology AB Prétraitement de matériau cellulosique
EP2447415A1 (fr) * 2009-07-01 2012-05-02 Lignotech Developments Limited Traitement de matériaux lignocellulosiques apparentés
EP2427534A4 (fr) * 2009-04-30 2014-11-12 Eve Res Inc Préparation de biocombustibles et d'autres produits utiles tels que le 5-(hydroxyméthyl)furfural
CN104562827A (zh) * 2014-12-11 2015-04-29 陕西科技大学 一种实验室模拟长网纸机的动态成形装置
WO2021110188A1 (fr) * 2019-12-03 2021-06-10 Klingele Papierwerke Gmbh & Co. Kg Procédé et dispositif de production d'un matériau fibreux, comportant un système d'alimentation et un système à vis hélicoïdales
CN113613772A (zh) * 2019-03-20 2021-11-05 伊米尔技术有限公司 用于在进一步加工成增值产品之前处理有机材料的蒸汽爆破设备和方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1872996A (en) * 1925-05-21 1932-08-23 Masonite Corp Process of making paper pulp
US2234188A (en) * 1938-03-31 1941-03-11 Masonite Corp Process of making light-colored ligno-cellulose fiber
SE434652B (sv) * 1977-04-27 1984-08-06 Commw Scient Ind Res Org Forfarande for explosionsdefibrering av cellulosafibrer fran vextmaterial samt utmatningsmunstycke for genomforande av forfarandet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1872996A (en) * 1925-05-21 1932-08-23 Masonite Corp Process of making paper pulp
US2234188A (en) * 1938-03-31 1941-03-11 Masonite Corp Process of making light-colored ligno-cellulose fiber
SE434652B (sv) * 1977-04-27 1984-08-06 Commw Scient Ind Res Org Forfarande for explosionsdefibrering av cellulosafibrer fran vextmaterial samt utmatningsmunstycke for genomforande av forfarandet

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284585A3 (fr) * 1987-03-24 1991-04-17 Stake Technology Ltd. Procédé de fabrication de pâte papetière
EP0501059B1 (fr) * 1991-02-28 1995-11-29 Bohuslav Vaclav Kokta Procédé de lessivage par explosion à la vapeur pour faire du papier
US6506282B2 (en) 1998-12-30 2003-01-14 Kimberly-Clark Worldwide, Inc. Steam explosion treatment with addition of chemicals
US6413362B1 (en) 1999-11-24 2002-07-02 Kimberly-Clark Worldwide, Inc. Method of steam treating low yield papermaking fibers to produce a permanent curl
EP1571255A1 (fr) * 2004-03-03 2005-09-07 SCA Hygiene Products GmbH Dispositif et procédé de réduction de la perte de vapeur dans un système fermé
WO2005085519A1 (fr) * 2004-03-03 2005-09-15 Sca Hygiene Products Gmbh Procede et dispositif de reduction des pertes de vapeur dans un systeme ferme
US9683328B2 (en) 2009-04-30 2017-06-20 Eve Research Inc. Preparation of biofuels and other useful products such as 5-(hydroxymethyl)-furfural
EP2427534A4 (fr) * 2009-04-30 2014-11-12 Eve Res Inc Préparation de biocombustibles et d'autres produits utiles tels que le 5-(hydroxyméthyl)furfural
EP2447415A1 (fr) * 2009-07-01 2012-05-02 Lignotech Developments Limited Traitement de matériaux lignocellulosiques apparentés
EP2448731A4 (fr) * 2009-07-01 2016-07-27 Lignotech Developments Ltd Traitement de matériaux lignocellulosiques et matériaux apparentés
US8834633B2 (en) 2009-12-21 2014-09-16 Sekab E-Technology Ab Pre-treatment of cellulosic material
WO2011080131A3 (fr) * 2009-12-21 2011-09-29 Sekab E-Technology Ab Prétraitement de matière cellulosique
US9528129B2 (en) 2009-12-21 2016-12-27 Sekab E-Technology Ab Pre-treatment of cellulosic material
EP2336344A1 (fr) * 2009-12-21 2011-06-22 Sekab E-Technology AB Prétraitement de matériau cellulosique
CN104562827A (zh) * 2014-12-11 2015-04-29 陕西科技大学 一种实验室模拟长网纸机的动态成形装置
CN113613772A (zh) * 2019-03-20 2021-11-05 伊米尔技术有限公司 用于在进一步加工成增值产品之前处理有机材料的蒸汽爆破设备和方法
WO2021110188A1 (fr) * 2019-12-03 2021-06-10 Klingele Papierwerke Gmbh & Co. Kg Procédé et dispositif de production d'un matériau fibreux, comportant un système d'alimentation et un système à vis hélicoïdales

Also Published As

Publication number Publication date
SE455314B (sv) 1988-07-04
SE8504083D0 (sv) 1985-09-03
SE8504083L (sv) 1987-03-04

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