US20090038767A1 - Method and System for Semi-Chemical Pulping - Google Patents

Method and System for Semi-Chemical Pulping Download PDF

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Publication number
US20090038767A1
US20090038767A1 US12/173,132 US17313208A US2009038767A1 US 20090038767 A1 US20090038767 A1 US 20090038767A1 US 17313208 A US17313208 A US 17313208A US 2009038767 A1 US2009038767 A1 US 2009038767A1
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US
United States
Prior art keywords
cooking vessel
liquor
extraction screen
cooking
lignin
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.)
Abandoned
Application number
US12/173,132
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English (en)
Inventor
C. Bertil Stromberg
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.)
Andritz Inc
Original Assignee
Andritz Inc
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 Andritz Inc filed Critical Andritz Inc
Priority to US12/173,132 priority Critical patent/US20090038767A1/en
Priority to CA2638196A priority patent/CA2638196C/en
Priority to AU2008203206A priority patent/AU2008203206B2/en
Priority to RU2008130768/12A priority patent/RU2479682C2/ru
Priority to PT80136591T priority patent/PT2034090E/pt
Priority to EP20080013659 priority patent/EP2034090B1/en
Priority to ES08013659.1T priority patent/ES2525700T3/es
Priority to JP2008199466A priority patent/JP5060421B2/ja
Priority to CL2008002309A priority patent/CL2008002309A1/es
Priority to BRPI0803333-1A priority patent/BRPI0803333A2/pt
Priority to CN2008101349531A priority patent/CN101387087B/zh
Assigned to ANDRITZ INC. reassignment ANDRITZ INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STROMBERG, C. BERTIL
Publication of US20090038767A1 publication Critical patent/US20090038767A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • D21C7/00—Digesters

Definitions

  • the present invention generally relates to a method and system for making a semi-chemical pulp from lignocellulosic material.
  • Semi-chemical pulping processes are known. See, e.g., U.S. Pat. No. 4,229,251 to Temler; U.S. Pat. No. 4,073,678 to Hammond et al. Semi-chemical pulping processes have different requirements and different operating conditions than pulping processes involving Lo-Solids® Cooking, such as those disclosed in U.S. Pat. No. 5,489,363 to Marcoccia et al.
  • NaOH, Na 2 CO 3 , and Na 2 SO 3 may be used separately or in combination or subcombinations. These chemicals may be advantageous because they have a minimum smell and may be regenerated in relatively simple recovery systems typically used for kraft liquor, especially when NaOH and/or Na 2 CO 3 are used. Each chemical or combination thereof may produce its own pulp characteristics from the different types of wood used (e.g., various types of hardwood). Accordingly, the particular combination or subcombination may be selected based on the individual criteria of a producer.
  • Green liquor is produced by combusting kraft black liquor and dissolving the resultant smelt into white liquor.
  • White liquor generally includes a mixture of NaOH and Na 2 S, and green liquor includes those chemicals in addition to the chemicals in the smelt resulting from the combustion of the black liquor.
  • This clogging or coating may be caused by lignin that has precipitated out of solution due to the lower pH at the end of the cook.
  • the pH decrease may result from the consumption of carbonate ion (CO 3 2 ⁇ ).
  • CO 3 2 ⁇ carbonate ion
  • certain embodiments of the present invention generally relate to a method for inhibiting fouling of a black liquor extraction screen in a cooking vessel for semi-chemical pulping.
  • the method may comprise the steps of: feeding lignocellulosic material and green liquor to the cooking vessel for semi-chemical pulping; cooking the lignocellulosic material in the cooking vessel for semi-chemical pulping such that some or all lignin is separated from the lignocellulosic material, and wherein lignin is dissolved into a cooking liquor; extracting via an extraction screen black liquor comprising dissolved lignin, wherein the black liquor is formed during the semi-chemical pulping process from the cooking vessel; and adding white liquor or a base to the cooking vessel at or near the extraction screen, such that a pH at or near the extraction screen is elevated and inhibits lignin from adhering to the extraction screen.
  • certain embodiments of the present invention generally relate to a cooking vessel for a process of semi-chemical pulping of lignocellulosic material that inhibits fouling of a black liquor extraction screen in the cooking vessel.
  • the cooking vessel may comprise: a first input conduit to the cooking vessel that carries green liquor; a second input conduit to the cooking vessel that carries lignocellulosic material; a cavity in which lignin is separated from the lignocellulosic material and dissolved into a cooking liquor; an extraction screen connected to an extraction conduit that extracts black liquor comprising dissolved lignin, wherein the black liquor is formed during the semi-chemical pulping process from the cooking vessel; and a third input conduit for delivering white liquor or a base to the cooking vessel at or near the extraction screen, such that a pH at or near the extraction screen is elevated and inhibits lignin from adhering to the extraction screen.
  • FIG. 1 illustrates a digester in accordance with an embodiment of the present invention.
  • FIG. 2 illustrates a digester in accordance with another embodiment of the present invention.
  • certain embodiments of the present invention generally relate to increasing the pH at the end of the cook. This may keep the screens cleaner for a longer period of time.
  • the increased pH may be accomplished by adding white liquor or NaOH (or any other base) through a circulation and/or central pipe at the end of the cook.
  • the pH of the cooking liquor (e.g., black liquor with lignin) at the end of the cook should be 10 or higher, preferable between 10 and 13, and most preferably between 10 and 12.
  • the pH at or near the extraction screen(s) may be elevated when compared with the pH of liquor above the extraction screens. This, in turn, may increase the solubility of the lignin at or near the extraction screen(s).
  • the pH level is raised of a liquid at or near an extraction screen of a vessel in which semi-chemical pulping is performed. In certain embodiments, this may cause an increase in the solubility of lignin and may also decrease the tendency of an extraction screen to clog.
  • FIG. 1 shows a portion of a semi-chemical pulping system 100 that includes a digester 110 .
  • the inputs to the digester 110 include a conduit 102 , which generally contains at least green liquor and uncooked pulp comprising lignocellulosic material. Conduit 102 (or another conduit) may supply other chemicals, such as, for example, NaOH, Na 2 CO 3 , Na 2 SO 3 , and/or white liquor, to the digester 110 .
  • the inputs to the digester 110 also include conduit 108 , which supplies white liquor, NaOH (and/or other bases), and/or other agents that may increase the solubility of lignin and/or decrease the likelihood of extraction screen clogging.
  • the pulp is cooked in digester 110 , which contains various extraction screens. Though digester 110 may contain various extraction screens at different elevations, extraction screen 112 illustrates where the spent or used liquor (i.e., black liquor) is removed or extracted from the digester 110 . Black liquor is extracted via conduit 114 , which splits into conduit 116 and conduit 106 . The flow content of conduit 116 is mixed with the flow content of conduit 108 (e.g., white liquor and/or NaOH) and recycled back into digester 110 via conduit 118 . This recycle loop may facilitate the efficient extraction of lignin in the black liquor while perhaps reducing the amount of white liquor and/or NaOH required.
  • This recycle loop may facilitate the efficient extraction of lignin in the black liquor while perhaps reducing the amount of white liquor and/or NaOH required.
  • the end of conduit 118 is positioned at or near the extraction screen 112 .
  • the end of conduit 118 may deliver the contents of conduit 118 in a concentrated location at or near extraction screen 112 or may deliver the contents at or near substantially the entire surface of extraction screen 112 within the digester.
  • the end of conduit 118 may be incorporated into the extraction screen 112 .
  • the distance from the addition point to the extraction screen may be such that the pH is increased across substantially the entire surface of the extraction screen so as to inhibit the adherence of lignin to the extraction screen.
  • FIG. 2 shows a portion of another semi-chemical pulping system 200 that includes a digester 210 .
  • the inputs to the digester 210 include conduit 202 , which generally contains at least green liquor and uncooked pulp.
  • the conduit 202 may also supply other chemicals, such as, for example, NaOH, Na 2 CO 3 , Na 2 SO 3 , and/or white liquor.
  • the inputs to the digester 210 also include liquor such as white liquor, NaOH (and/or other bases), and/or other agents through the conduit 208 that may increase the solubility of lignin and/or decrease the likelihood of extraction screen clogging.
  • the pulp is cooked in digester 210 , which contains various extraction screens. Though digester 210 may contain various extraction screens at different elevations, the extraction screen 212 illustrates where the spent or used liquor (i.e., black liquor) is removed or extracted from the digester 210 . In the illustrated embodiment, black liquor is extracted via conduit 206 .
  • spent or used liquor i.e., black liquor
  • the liquor supply conduit 208 feeds into and/or through (as illustrated) a center pipe 220 of the digester.
  • the end of liquor supply conduit 208 and/or center pipe 220 is positioned at or near extraction screen 212 .
  • the end of liquor supply conduit 208 and/or center pipe 220 may deliver the contents of the liquor supply conduit 208 and/or center pipe 220 in a concentrated location at or near extraction screen 212 or may deliver the contents at or near the substantially the entire surface of extraction screen 212 .
  • the end of liquor supply conduit 208 and/or center pipe 220 may be incorporated into extraction screen 212 .
  • the distance from the addition point to the extraction screen may be such that the pH is increased across substantially the entire surface of the extraction screen so as to inhibit the adherence of lignin to the extraction screen.

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  • Paper (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)
US12/173,132 2007-08-07 2008-07-15 Method and System for Semi-Chemical Pulping Abandoned US20090038767A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US12/173,132 US20090038767A1 (en) 2007-08-07 2008-07-15 Method and System for Semi-Chemical Pulping
CA2638196A CA2638196C (en) 2007-08-07 2008-07-18 Method and system for semi-chemical pulping
AU2008203206A AU2008203206B2 (en) 2007-08-07 2008-07-18 Method and System for Semi-Chemical Pulping
RU2008130768/12A RU2479682C2 (ru) 2007-08-07 2008-07-24 Способ и система для варки полуцеллюлозы
EP20080013659 EP2034090B1 (en) 2007-08-07 2008-07-30 Method and apparatus for semi-chemical pulping
PT80136591T PT2034090E (pt) 2007-08-07 2008-07-30 Método e aparelho para polpação semiquímica
ES08013659.1T ES2525700T3 (es) 2007-08-07 2008-07-30 Procedimiento y aparato para producción de pasta semiquímica
JP2008199466A JP5060421B2 (ja) 2007-08-07 2008-08-01 セミ−ケミカルパルプ製造方法および装置
CL2008002309A CL2008002309A1 (es) 2007-08-07 2008-08-06 Metodo para inhibir el ensuciamiento de un tamiz de extraccion de licor negro en un recipiente de coccion para la obtencion semiquimica de pulpa, que comprende agregar licor blanco y una base al recipiente de coccion en o cerca del tamiz de extraccion, para elevar localmente el ph en dicha zona.
BRPI0803333-1A BRPI0803333A2 (pt) 2007-08-07 2008-08-06 método e sistema para polpação semiquìmica
CN2008101349531A CN101387087B (zh) 2007-08-07 2008-08-07 用于半化学浆化的方法和系统

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US95444607P 2007-08-07 2007-08-07
US12/173,132 US20090038767A1 (en) 2007-08-07 2008-07-15 Method and System for Semi-Chemical Pulping

Publications (1)

Publication Number Publication Date
US20090038767A1 true US20090038767A1 (en) 2009-02-12

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ID=40345370

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/173,132 Abandoned US20090038767A1 (en) 2007-08-07 2008-07-15 Method and System for Semi-Chemical Pulping

Country Status (10)

Country Link
US (1) US20090038767A1 (ja)
JP (1) JP5060421B2 (ja)
CN (1) CN101387087B (ja)
AU (1) AU2008203206B2 (ja)
BR (1) BRPI0803333A2 (ja)
CL (1) CL2008002309A1 (ja)
ES (1) ES2525700T3 (ja)
PT (1) PT2034090E (ja)
RU (1) RU2479682C2 (ja)
ZA (1) ZA200806264B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102704296A (zh) * 2012-07-09 2012-10-03 温志明 一种预处理秸秆类原料的工艺
WO2021232132A1 (en) * 2020-05-22 2021-11-25 Suzano S.A. Method for unplugging or cleaning a screen in a continuous process kraft cooking digester

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100263813A1 (en) * 2009-04-21 2010-10-21 Andritz Inc. Green liquor pretreatment of lignocellulosic material
EP2591165B1 (en) * 2010-07-09 2020-05-06 Valmet Aktiebolag Method and system for impregnating chips
CN102787521A (zh) * 2011-05-16 2012-11-21 张世乐 一种用于间歇蒸煮的蒸煮液补偿技术
CN105019290B (zh) * 2015-08-03 2017-01-11 海南金海浆纸业有限公司 一种制浆造纸蒸解釜筛板处理方法
CN112025906B (zh) * 2020-09-10 2021-11-16 大禾(上海)环保科技有限公司 一种秸秆联产黄腐酸的无胶无醛纤维板生产工艺

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811995A (en) * 1972-09-05 1974-05-21 Westvaco Corp Method of high yield semichemical pulp production
US5536367A (en) * 1995-01-25 1996-07-16 Salminen; Reijo K. Pulp digester cleaning system
US5565061A (en) * 1994-06-14 1996-10-15 Salminen; Reijo Method and apparatus for removing scales deposited on the strainer of a pulp digester
US6132556A (en) * 1993-05-04 2000-10-17 Andritz-Ahlstrom Inc. Method of controlling pulp digester pressure via liquor extraction
US6277240B1 (en) * 1998-10-02 2001-08-21 Andritz-Ahlstrom Inc. Method for continuously pulping cellulosic fibrous material
US20010032711A1 (en) * 1998-10-26 2001-10-25 C. Bertil Stromberg Pulp cooking with particular alkali profiles
US20030075290A1 (en) * 2001-06-06 2003-04-24 Thompson Jacob Owen Method for inhibiting calcium salt scale

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GB1432245A (en) * 1972-05-01 1976-04-14 Westvaco Corp Method of pulping wood
JPS53119302A (en) * 1977-03-19 1978-10-18 Toyo Pulp Co Ltd Production of alkali pulp
JPS569494A (en) * 1979-06-29 1981-01-30 Mitsubishi Heavy Ind Ltd Causticizing method and apparatus of green liquor
CA2037717C (en) * 1990-09-17 1996-03-05 Bertil Stromberg Extended kraft cooking with white liquor added to wash circulation
US6248208B1 (en) * 1995-06-02 2001-06-19 Andritz-Ahlstrom Inc. Pretreatment of chips before cooking
CN1201851A (zh) * 1998-05-22 1998-12-16 陈源 棉浆及其他粗浆清洁生产工艺
JP2000080580A (ja) * 1998-09-04 2000-03-21 Daishowa Paper Mfg Co Ltd 連続蒸解釜におけるスケ−ル除去方法
FI120547B (fi) * 2004-10-04 2009-11-30 Metso Paper Inc Alkalinen keittomenetelmä ja laitteisto massan valmistamiseksi
FI126694B (fi) * 2005-12-02 2017-04-13 Metsä Board Oyj Kemimekaaninen massa ja menetelmä sen valmistamiseksi

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811995A (en) * 1972-09-05 1974-05-21 Westvaco Corp Method of high yield semichemical pulp production
US6132556A (en) * 1993-05-04 2000-10-17 Andritz-Ahlstrom Inc. Method of controlling pulp digester pressure via liquor extraction
US5565061A (en) * 1994-06-14 1996-10-15 Salminen; Reijo Method and apparatus for removing scales deposited on the strainer of a pulp digester
US5536367A (en) * 1995-01-25 1996-07-16 Salminen; Reijo K. Pulp digester cleaning system
US6277240B1 (en) * 1998-10-02 2001-08-21 Andritz-Ahlstrom Inc. Method for continuously pulping cellulosic fibrous material
US20010032711A1 (en) * 1998-10-26 2001-10-25 C. Bertil Stromberg Pulp cooking with particular alkali profiles
US20030075290A1 (en) * 2001-06-06 2003-04-24 Thompson Jacob Owen Method for inhibiting calcium salt scale

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102704296A (zh) * 2012-07-09 2012-10-03 温志明 一种预处理秸秆类原料的工艺
WO2021232132A1 (en) * 2020-05-22 2021-11-25 Suzano S.A. Method for unplugging or cleaning a screen in a continuous process kraft cooking digester

Also Published As

Publication number Publication date
PT2034090E (pt) 2014-12-19
CL2008002309A1 (es) 2009-03-13
AU2008203206A1 (en) 2009-02-26
CN101387087B (zh) 2013-05-15
BRPI0803333A2 (pt) 2009-04-07
JP5060421B2 (ja) 2012-10-31
RU2479682C2 (ru) 2013-04-20
RU2008130768A (ru) 2010-01-27
JP2009041175A (ja) 2009-02-26
CN101387087A (zh) 2009-03-18
ZA200806264B (en) 2009-10-28
ES2525700T3 (es) 2014-12-29
AU2008203206B2 (en) 2011-12-15

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AS Assignment

Owner name: ANDRITZ INC., NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:STROMBERG, C. BERTIL;REEL/FRAME:021578/0459

Effective date: 20080728

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION