EP2034090A1 - Verfahren und Vorrichtung zum semi-chemischen Aufschliessen - Google Patents

Verfahren und Vorrichtung zum semi-chemischen Aufschliessen Download PDF

Info

Publication number
EP2034090A1
EP2034090A1 EP08013659A EP08013659A EP2034090A1 EP 2034090 A1 EP2034090 A1 EP 2034090A1 EP 08013659 A EP08013659 A EP 08013659A EP 08013659 A EP08013659 A EP 08013659A EP 2034090 A1 EP2034090 A1 EP 2034090A1
Authority
EP
European Patent Office
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.)
Granted
Application number
EP08013659A
Other languages
English (en)
French (fr)
Other versions
EP2034090B1 (de
Inventor
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40262182&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2034090(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from US12/173,132 external-priority patent/US20090038767A1/en
Application filed by Andritz Inc filed Critical Andritz Inc
Publication of EP2034090A1 publication Critical patent/EP2034090A1/de
Application granted granted Critical
Publication of EP2034090B1 publication Critical patent/EP2034090B1/de
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • 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
    • D21C9/008—Prevention of corrosion or formation of deposits on pulp-treating equipment
    • 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
    • D21C7/14—Means for circulating the lye
    • 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
    • D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching

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. Patent No. 4,229,251 to Temler ; U.S. Patent 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. Patent 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.
  • 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 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.
  • Figure 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.
  • FIGURE 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.
  • 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 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.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP20080013659 2007-08-07 2008-07-30 Verfahren und Vorrichtung zum semi-chemischen Aufschliessen Revoked EP2034090B1 (de)

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 (2)

Publication Number Publication Date
EP2034090A1 true EP2034090A1 (de) 2009-03-11
EP2034090B1 EP2034090B1 (de) 2014-10-22

Family

ID=40262182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080013659 Revoked EP2034090B1 (de) 2007-08-07 2008-07-30 Verfahren und Vorrichtung zum semi-chemischen Aufschliessen

Country Status (2)

Country Link
EP (1) EP2034090B1 (de)
CA (1) CA2638196C (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010044732A1 (en) * 2008-10-13 2010-04-22 Metso Fiber Karlstad Ab Method for preventing clogging in a strainer construction for a continuous digester
WO2019009792A1 (en) * 2017-07-04 2019-01-10 Valmet Ab PROCESS FOR OPERATING A CONTINUOUS VERTICAL REACTOR COMPRISING A PRE-HYDROLYSIS AREA AND REACTOR DESIGN AS SUCH
DE202021004173U1 (de) 2021-07-09 2022-12-12 Essity Hygiene And Health Aktiebolag Mehrlagiges Gewebepapierprodukt aufweisend holzfreie Fasern
DE202021004174U1 (de) 2021-07-09 2022-12-13 Essity Hygiene And Health Aktiebolag Mehrlagiges Gewebepapierprodukt aufweisend holzfreie Fasern
DE202021004172U1 (de) 2021-07-09 2023-01-10 Essity Hygiene And Health Aktiebolag Mehrlagiges Gewebepapierprodukt

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2584664C2 (ru) * 2014-05-14 2016-05-20 Общество с ограниченной ответственностью "Управляющая компания "Объединенные бумажные фабрики" Способ получения полуцеллюлозы с использованием смеси гидроксида натрия и карбоната натрия для производства тарного картона
RU2584665C2 (ru) * 2014-05-14 2016-05-20 Общество с ограниченной ответственностью "Управляющая компания "Объединенные бумажные фабрики" Способ получения полуцеллюлозы с использованием гидроксида натрия для производства тарного картона

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0476230A2 (de) 1990-09-17 1992-03-25 Kamyr, Inc. Verlängertes Kraftkochen mit dem Waschkreislauf zugefügter Weisslauge
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
WO2005116328A1 (en) * 2004-05-28 2005-12-08 Metso Paper, Inc. Screen device for a digester for producing pulp

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0476230A2 (de) 1990-09-17 1992-03-25 Kamyr, Inc. Verlängertes Kraftkochen mit dem Waschkreislauf zugefügter Weisslauge
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
WO2005116328A1 (en) * 2004-05-28 2005-12-08 Metso Paper, Inc. Screen device for a digester for producing pulp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010044732A1 (en) * 2008-10-13 2010-04-22 Metso Fiber Karlstad Ab Method for preventing clogging in a strainer construction for a continuous digester
WO2019009792A1 (en) * 2017-07-04 2019-01-10 Valmet Ab PROCESS FOR OPERATING A CONTINUOUS VERTICAL REACTOR COMPRISING A PRE-HYDROLYSIS AREA AND REACTOR DESIGN AS SUCH
DE202021004173U1 (de) 2021-07-09 2022-12-12 Essity Hygiene And Health Aktiebolag Mehrlagiges Gewebepapierprodukt aufweisend holzfreie Fasern
DE202021004174U1 (de) 2021-07-09 2022-12-13 Essity Hygiene And Health Aktiebolag Mehrlagiges Gewebepapierprodukt aufweisend holzfreie Fasern
DE202021004172U1 (de) 2021-07-09 2023-01-10 Essity Hygiene And Health Aktiebolag Mehrlagiges Gewebepapierprodukt

Also Published As

Publication number Publication date
CA2638196A1 (en) 2009-02-07
CA2638196C (en) 2015-12-15
EP2034090B1 (de) 2014-10-22

Similar Documents

Publication Publication Date Title
EP2034090A1 (de) Verfahren und Vorrichtung zum semi-chemischen Aufschliessen
AU2008203206B2 (en) Method and System for Semi-Chemical Pulping
JP5101917B2 (ja) 広葉樹材からアルカリパルプを製造する方法および装置
EP2678470B1 (de) Verfahren und vorrichtung zur herstellung eines zellstoffs durch vorhydrolyse und kraftkochen
US7976675B2 (en) Continuous digester system
US7713383B2 (en) Arrangement for feeding a slurry of chips and liquid
CA1043515A (en) Method for controlling batch alkaline pulp digestion in combination with continuous alkaline oxygen delignification
US7918967B2 (en) Apparatus for decreasing scaling in digester systems
SE526202C2 (sv) Impregnering av finfördelat cellulosafibermaterial med antrakinon utan närvaro av alkali
JP3623469B2 (ja) 直立式連続細砕セルロース繊維材蒸解カンの圧力制御方法
US5824188A (en) Method of controlling the pressure of a continuous digester using an extraction-dilution
US6132556A (en) Method of controlling pulp digester pressure via liquor extraction
US6203662B1 (en) Method for the continuous cooking of pulp in a digester system having a top separator
US20120261084A1 (en) System and method for the pumped feed of chips to a continuous digester
JP4922485B2 (ja) リグノセルロース繊維材料の連続蒸煮方法
JP7554185B2 (ja) 前加水分解反応器へ木材チップを供給する方法
Råmark et al. Andritz’s new technology applied to dissolving pulp grades–a different approach
US20170022664A1 (en) Method of digesting cellulose fibrous material in a continuous digester
US20190127912A1 (en) Screen feed arrangement
EP0471154A2 (de) Modifizierter und kontinuierlicher Sulfitaufschluss
JP2004353108A (ja) 塔状ベッセル型連続蒸解釜によるパルプ連続製造方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

17P Request for examination filed

Effective date: 20090623

17Q First examination report despatched

Effective date: 20090727

AKX Designation fees paid

Designated state(s): AT DE ES FI PT SE

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20131129

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20140603

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE ES FI PT SE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 692735

Country of ref document: AT

Kind code of ref document: T

Effective date: 20141115

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602008034968

Country of ref document: DE

Effective date: 20141204

REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20141209

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2525700

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20141229

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 692735

Country of ref document: AT

Kind code of ref document: T

Effective date: 20141022

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20141022

REG Reference to a national code

Ref country code: DE

Ref legal event code: R026

Ref document number: 602008034968

Country of ref document: DE

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: VALMET AB

Effective date: 20150709

PLAX Notice of opposition and request to file observation + time limit sent

Free format text: ORIGINAL CODE: EPIDOSNOBS2

PLAF Information modified related to communication of a notice of opposition and request to file observations + time limit

Free format text: ORIGINAL CODE: EPIDOSCOBS2

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602008034968

Country of ref document: DE

PLBB Reply of patent proprietor to notice(s) of opposition received

Free format text: ORIGINAL CODE: EPIDOSNOBS3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160202

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20160713

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PT

Payment date: 20160729

Year of fee payment: 9

Ref country code: SE

Payment date: 20160720

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20160715

Year of fee payment: 9

REG Reference to a national code

Ref country code: DE

Ref legal event code: R064

Ref document number: 602008034968

Country of ref document: DE

Ref country code: DE

Ref legal event code: R103

Ref document number: 602008034968

Country of ref document: DE

RDAF Communication despatched that patent is revoked

Free format text: ORIGINAL CODE: EPIDOSNREV1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 20170517

REG Reference to a national code

Ref country code: SE

Ref legal event code: ECNC

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED