WO2013032377A1 - Procédé de cuisson kraft utilisant une liqueur de cuisson au polysulfure - Google Patents

Procédé de cuisson kraft utilisant une liqueur de cuisson au polysulfure Download PDF

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Publication number
WO2013032377A1
WO2013032377A1 PCT/SE2011/051038 SE2011051038W WO2013032377A1 WO 2013032377 A1 WO2013032377 A1 WO 2013032377A1 SE 2011051038 W SE2011051038 W SE 2011051038W WO 2013032377 A1 WO2013032377 A1 WO 2013032377A1
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WO
WIPO (PCT)
Prior art keywords
cooking
liquor
polysulfide
impregnation stage
concentration
Prior art date
Application number
PCT/SE2011/051038
Other languages
English (en)
Inventor
Mikael Lindström
Fredrik Wilgotson
Original Assignee
Metso Paper Sweden Ab
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=47756632&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2013032377(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Metso Paper Sweden Ab filed Critical Metso Paper Sweden Ab
Priority to CN201180073158.6A priority Critical patent/CN103827388B/zh
Priority to US14/241,141 priority patent/US20140299283A1/en
Priority to JP2014528324A priority patent/JP5989777B2/ja
Priority to EP11871390.8A priority patent/EP2751331B2/fr
Priority to PCT/SE2011/051038 priority patent/WO2013032377A1/fr
Publication of WO2013032377A1 publication Critical patent/WO2013032377A1/fr
Priority to US15/283,711 priority patent/US9580864B2/en

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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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes

Definitions

  • the present invention relates to a method for the preparation of kraft pulp with increased pulping yield from lignin-containing cellulosic material using polysulfide cooking liquor.
  • Cooking methods was therefore developed in order to reduce the detrimental high alkali peak concentrations at start of the cook, and thus was split charges of alkali during the cook implemented in cooking methods such as MCC, EMCC, ITC and Lo-Solids cooking.
  • Metso disclosed a pretreatment stage using polysulfide cooking liquor ahead of black liquor treatment.
  • the polysulfide treatment liquor drained after the pretreatment stage and before starting the black liquor treatment.
  • the polysulfide treatment stage was also preferably kept short with treatment time in the range 2- 10 minutes.
  • the invention is based upon the surprising finding that concentration of polysulfide should be kept high in a low temperature pretreatment stage at relatively long retention time before cooking, using liquor to wood ratios well below that as commonly used.
  • the stabilization effect of carbohydrates the major objective for polysulfide addition, has shown to be improved dramatically if using a liquor to wood ratio of about 2,9 instead of the conventional liquor to wood ratio of about 3,5, and all other conditions equal. This non proportional effect of low liquor to wood ratio has not been disclosed or realized before despite the numerous proposals for improving cooking yield using polysulfide cooking liquor.
  • One object of the present invention is to provide an improved method for the preparation of kraft pulp with increased pulping yield from lignin-containing cellulosic material using polysulfide cooking liquor, wherein the lignin-containing cellulosic material is heated to a temperature in the range 50-100 °C followed by adding polysulfide cooking liquor to a first impregnation stage which in turn is followed by cooking stages resulting in a kraft pulp with a kappa number below 40, and wherein the impregnation stage is conducted at high alkali concentration, low temperature and high polysulfide concentration using polysulfide cooking liquor at a liquor-to-wood ratio in the range 2.0 to 3.2 , and that the temperature is between 80-120 °C during a retention time resulting in a h-factor in the range 2-20 and preferably 2-10 of the impregnation stage.
  • This low h-factor is indicative for that no cooking or delignification effect is obtained in the first impregnation stage, and hence is no reduction in pulp viscosity seen as could be the case if high alkali concentrations are at hand in cooking stages at higher temperatures.
  • the method is the effective alkali concentration during the impregnation stage above 60 g/l when adding the polysulfide cooking liquor.
  • the polysulfide concentration during the impregnation stage above 3 g/l, or above 0,09 mol/l, when adding the polysulfide cooking liquor.
  • the method is more than 90% of the total charge of cooking liquor needed for completion of the cooking stages to the intended kappa number below 40 charged to the first impregnation stage, and that at least 175 kg of alkali (EA as NaOH) per ton of chips is charged for softwood and at least 160 kg of alkali per ton of chips for hardwood.
  • EA alkali
  • the alkali concentration reduced by at least 8 g/l by adding additional cooking liquids having less alkali concentration than the alkali concentration prevailing at end of the first impregnation stage when increasing the temperature to cooking temperature, said cooking liquids in at least part thereof includes black liquor.
  • the inventive method has also preferably the white liquor added to the first impregnation stage an alkali concentration above 100 g/l and a polysulfide concentration above 4 g/l.
  • the lignin-containing cellulosic materials to be used in the present process are suitably softwood, hardwood, or annual plants.
  • FIG. 1 is a schematic cooking system capable of implementing the inventive method
  • FIG. 2 demonstrate an example of the alkali profile established with the inventive method ;
  • FIG. 3 show the dramatic impact on increased yield when increasing the polysulfide concentration above 0.15 mol/L
  • FIG. 4 show the relative stabilization of carbohydrates as a function of liquid to wood ratio during the impregnation stage.
  • FIG 1 a 2-vessel kraft cooking system, having a first hydraulic impregnation vessel B and a second steam/liquid phase digester C, wherein the inventive method could be implemented.
  • this type of system is first the lignin containing cellulosic material Ch fed to a bin A wherein the cellulosic material is heated to a temperature in the range 50-100 °C by using addition of steam St.
  • the lignin containing cellulosic material could preferably be wood chips.
  • the treatment liquor here is preferably only polysulfide cooking liquor, WL, and preferably is the entire charge of cooking liquor needed for the cooking process charged here.
  • the chips suspended in the treatment liquor are fed to the sluice feeder and displaced liquid is fed out from the bottom outlet of the sluice feeder and returned to the chute in a low pressure circulation.
  • the chips in the sluice feeder is pressurized by the return flow from the vessel B and fed out to the top separator TS in top of the vessel B.
  • the first impregnation stage is implemented in the vessel B and preferably only with the polysulfide cooking liquor and as small amount as possible of additional liquids such as wood moisture, steam condensates, and especially no black liquor nor additional water or filtrates.
  • the resulting liquor-to-wood ratio established should be in the range 2.0 to 3.2 and the temperature should be in the range 80-120 ⁇ .
  • the impregnated chips will be fed to the steam/liquid phase digester C together with the residual treatment liquor.
  • a conventional transfer system with dilution in bottom of the vessel B using withdrawn treatment liquor from the top separator TS in the top of vessel C.
  • the chip suspension heated to full cooking temperature, in the range 140-170 ⁇ depending upon type of cellulosic material, and additional liquid is added in order to reduce the alkali concentration at this point.
  • a digester C with 2 concurrent cooking zones, one cooking zone above the first screen section and a second cooking zone above the final screen section in bottom of digester.
  • a final counter current wash zone implemented in bottom of digester by addition of wash water/Wash.
  • the final pulp with a kappa number below 40 is fed out from bottom in flow Pu.
  • figure 2 is disclosed the alkali concentration profile that could be established in a system like that disclosed in figure 1 , with alkali consumption of about 1 10 kg/BDT in the
  • impregnation vessel 45 kg/BDT in the first cooking zone in vessel C and 15 kg/BDT in last cooking zone in vessel C.
  • an alkali In the top of the first impregnation vessel B is an alkali
  • figure 3 is disclosed the improved carbohydrate yield as a function of the polysulfide concentration, when about 1 % lignin is still present in the pulp.
  • the dramatic increase in yield when increasing the polysulfide concentration above 0,15 mol/L There is basically a linearly increasing yield when the concentration increases between 0 to 0,15 mol/l. In this initial range is the yield increased from about 45% up to about 46.2%. However, when the concentration reach 0,2 mol/L is the yield increased to about 48,3%.
  • a series of tests has been made simulating a system as that shown in figure 1 using a white liquor having an alkali concentration of about 1 17 g/L and a polysulfide concentration of about 6 g/l.
  • the charges of flows to the first impregnation stage are in tests #1 -7 using part flows a-e. This results in a liquor to wood ratio shown in row L/W.
  • each polysulfide ion can be considered to consist of one atom "sulfide sulfur", i.e. sulfur in the formal oxidation state S(-ll), and n atoms of polysulfide "excess sulfur”, i.e. sulfur in the formal oxidation state S(0).

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de préparation de pâte à papier kraft avec un rendement accru en pâte à partir d'un matériau cellulosique contenant de la lignine en utilisant une liqueur de cuisson au polysulfure. Afin d'accroître la stabilisation des carbohydrates et donc le rendement tiré d'un processus de cuisson kraft, une première étape d'imprégnation utilisant une liqueur de cuisson au polysulfure est mise en œuvre à une forte concentration en base et en polysulfure et à basse température.
PCT/SE2011/051038 2011-08-30 2011-08-30 Procédé de cuisson kraft utilisant une liqueur de cuisson au polysulfure WO2013032377A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CN201180073158.6A CN103827388B (zh) 2011-08-30 2011-08-30 使用多硫化物蒸煮液的硫酸盐蒸煮方法
US14/241,141 US20140299283A1 (en) 2011-08-30 2011-08-30 Kraft cooking method using polysulfide cooking liquor
JP2014528324A JP5989777B2 (ja) 2011-08-30 2011-08-30 ポリスルフィド蒸煮液を用いたクラフト蒸煮法
EP11871390.8A EP2751331B2 (fr) 2011-08-30 2011-08-30 Procédé de cuisson kraft utilisant une liqueur de cuisson au polysulfure
PCT/SE2011/051038 WO2013032377A1 (fr) 2011-08-30 2011-08-30 Procédé de cuisson kraft utilisant une liqueur de cuisson au polysulfure
US15/283,711 US9580864B2 (en) 2011-08-30 2016-10-03 Kraft cooking method using polysulfide cooking liquor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2011/051038 WO2013032377A1 (fr) 2011-08-30 2011-08-30 Procédé de cuisson kraft utilisant une liqueur de cuisson au polysulfure

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US14/241,141 A-371-Of-International US20140299283A1 (en) 2011-08-30 2011-08-30 Kraft cooking method using polysulfide cooking liquor
US15/283,711 Continuation-In-Part US9580864B2 (en) 2011-08-30 2016-10-03 Kraft cooking method using polysulfide cooking liquor

Publications (1)

Publication Number Publication Date
WO2013032377A1 true WO2013032377A1 (fr) 2013-03-07

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PCT/SE2011/051038 WO2013032377A1 (fr) 2011-08-30 2011-08-30 Procédé de cuisson kraft utilisant une liqueur de cuisson au polysulfure

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US (1) US20140299283A1 (fr)
EP (1) EP2751331B2 (fr)
JP (1) JP5989777B2 (fr)
CN (1) CN103827388B (fr)
WO (1) WO2013032377A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016032374A1 (fr) * 2014-08-26 2016-03-03 Valmet Ab Procédé rentable de cuisson de kraft à l'aide d'une liqueur de cuisson au polysulfure
WO2018211175A1 (fr) * 2017-05-16 2018-11-22 Andritz Oy Procédé de production de pâte chimique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE1950606A1 (en) * 2019-05-22 2020-10-13 Valmet Oy A method for extracting hydrolyzate, a batch cooking system and a hydrolyzate extracting arrangement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567572A (en) 1967-09-06 1971-03-02 Pulp Paper Res Inst Polysulfide liquor impregnation of lignocellulose materials in a multistage pulping process
US3664919A (en) 1969-12-09 1972-05-23 Pulp Paper Res Inst Vapor phase polysulphide liquid pulping of lignocellulosic materials
WO1999014423A1 (fr) 1997-09-18 1999-03-25 Kvaerner Pulping Ab Procede de reduction en pate faisant appel a du polysulfure
WO2003057979A1 (fr) 2001-12-14 2003-07-17 Kvaerner Pulping Ab Pretraitement de copeaux avec de la lessive blanche prealablement a un traitement avec de la lessive noire
US20090126883A1 (en) 2007-11-20 2009-05-21 Jianer Jiang Use of polysulfide in modified cooking
CA2763651A1 (fr) * 2009-05-26 2010-12-02 Nippon Paper Industries Co., Ltd. Procede pour lessiver un materiau lignocellulosique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO131612C (fr) * 1969-12-09 1975-06-25 Pulp Paper Res Inst
JP3064607B2 (ja) * 1991-11-25 2000-07-12 王子製紙株式会社 修正クラフト法パルプの製造方法
US5660686A (en) * 1994-09-02 1997-08-26 Ahlstrom Machinery Inc. Cooking with spent liquor pretreatment of cellulose material
JP4298059B2 (ja) * 1999-05-28 2009-07-15 日本製紙株式会社 リグノセルロース材料の蒸解法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567572A (en) 1967-09-06 1971-03-02 Pulp Paper Res Inst Polysulfide liquor impregnation of lignocellulose materials in a multistage pulping process
US3664919A (en) 1969-12-09 1972-05-23 Pulp Paper Res Inst Vapor phase polysulphide liquid pulping of lignocellulosic materials
WO1999014423A1 (fr) 1997-09-18 1999-03-25 Kvaerner Pulping Ab Procede de reduction en pate faisant appel a du polysulfure
WO2003057979A1 (fr) 2001-12-14 2003-07-17 Kvaerner Pulping Ab Pretraitement de copeaux avec de la lessive blanche prealablement a un traitement avec de la lessive noire
US20090126883A1 (en) 2007-11-20 2009-05-21 Jianer Jiang Use of polysulfide in modified cooking
CA2763651A1 (fr) * 2009-05-26 2010-12-02 Nippon Paper Industries Co., Ltd. Procede pour lessiver un materiau lignocellulosique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2751331A4

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016032374A1 (fr) * 2014-08-26 2016-03-03 Valmet Ab Procédé rentable de cuisson de kraft à l'aide d'une liqueur de cuisson au polysulfure
RU2665424C1 (ru) * 2014-08-26 2018-08-29 Вальмет Аб Экономически эффективный способ сульфатной варки с применением полисульфидного варочного щелока
US10151063B2 (en) 2014-08-26 2018-12-11 Valmet Ab Cost efficient kraft cooking method using polysulfide cooking liquor
WO2018211175A1 (fr) * 2017-05-16 2018-11-22 Andritz Oy Procédé de production de pâte chimique
US11473241B2 (en) 2017-05-16 2022-10-18 Andritz Oy Method of producing chemical pulp

Also Published As

Publication number Publication date
EP2751331A1 (fr) 2014-07-09
JP2014525519A (ja) 2014-09-29
JP5989777B2 (ja) 2016-09-07
EP2751331A4 (fr) 2015-05-20
EP2751331B1 (fr) 2017-06-14
US20140299283A1 (en) 2014-10-09
EP2751331B2 (fr) 2020-04-22
CN103827388A (zh) 2014-05-28
CN103827388B (zh) 2016-09-21

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