SE503455C2 - Beredning av sulfitinnehållande kokvätska och användning av kokvätskan för förimpregnering - Google Patents

Beredning av sulfitinnehållande kokvätska och användning av kokvätskan för förimpregnering

Info

Publication number: SE503455C2
Authority: SE; Sweden
Prior art keywords: liquid; gas; sulphite; impregnation; cooking
Prior art date: 1993-09-27

Application number

SE9303137A

Other languages

English (en)

Swedish (sv)

Other versions

SE9303137L (sv

SE9303137D0 (sv

Inventor

Lars Stigsson

Jan-Erik Kignell

Original Assignee

Kvaerner Pulping Tech

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.)

1993-09-27

Filing date

1993-09-27

Publication date

1996-06-17

1993-09-27 Application filed by Kvaerner Pulping Tech filed Critical Kvaerner Pulping Tech

1993-09-27 Priority to SE9303137A priority Critical patent/SE503455C2/sv

1993-09-27 Publication of SE9303137D0 publication Critical patent/SE9303137D0/xx

1994-09-05 Priority to DE69419024T priority patent/DE69419024T2/de

1994-09-05 Priority to PCT/SE1994/000816 priority patent/WO1995009269A1/en

1994-09-05 Priority to AT94928525T priority patent/ATE181119T1/de

1994-09-05 Priority to CA002171748A priority patent/CA2171748C/en

1994-09-05 Priority to EP94928525A priority patent/EP0721527B1/de

1994-09-05 Priority to AU77927/94A priority patent/AU7792794A/en

1995-03-28 Publication of SE9303137L publication Critical patent/SE9303137L/

1996-06-17 Publication of SE503455C2 publication Critical patent/SE503455C2/sv

Links

239000007788 liquid Substances 0.000 title claims abstract description 78
238000010411 cooking Methods 0.000 title claims abstract description 40
LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 title claims abstract description 32
238000005470 impregnation Methods 0.000 title claims description 20
238000002360 preparation method Methods 0.000 title claims description 19
239000007789 gas Substances 0.000 claims abstract description 65
RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims abstract description 36
239000003513 alkali Substances 0.000 claims abstract description 24
CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 22
229920002678 cellulose Polymers 0.000 claims abstract description 17
239000001913 cellulose Substances 0.000 claims abstract description 17
BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 14
229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 12
239000001569 carbon dioxide Substances 0.000 claims abstract description 11
230000003647 oxidation Effects 0.000 claims abstract description 6
238000007254 oxidation reaction Methods 0.000 claims abstract description 6
UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 3
239000000463 material Substances 0.000 claims abstract description 3
UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract 2
229910002091 carbon monoxide Inorganic materials 0.000 claims abstract 2
238000000034 method Methods 0.000 claims description 32
RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 24
238000002309 gasification Methods 0.000 claims description 13
239000000126 substance Substances 0.000 claims description 13
239000004744 fabric Substances 0.000 claims description 10
238000001704 evaporation Methods 0.000 claims description 9
238000009835 boiling Methods 0.000 claims description 7
BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 6
239000002826 coolant Substances 0.000 claims description 6
229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 6
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
229910052760 oxygen Inorganic materials 0.000 claims description 5
239000001301 oxygen Substances 0.000 claims description 5
239000002655 kraft paper Substances 0.000 claims description 4
239000000155 melt Substances 0.000 claims description 4
229910001854 alkali hydroxide Inorganic materials 0.000 claims description 3
150000008044 alkali metal hydroxides Chemical class 0.000 claims description 3
239000008139 complexing agent Substances 0.000 claims description 3
230000029087 digestion Effects 0.000 claims description 3
239000002002 slurry Substances 0.000 claims description 3
239000002250 absorbent Substances 0.000 claims 1
230000002745 absorbent Effects 0.000 claims 1
239000000654 additive Substances 0.000 claims 1
239000013078 crystal Substances 0.000 claims 1
239000002657 fibrous material Substances 0.000 claims 1
238000010521 absorption reaction Methods 0.000 abstract description 36
238000004519 manufacturing process Methods 0.000 abstract description 7
229910052739 hydrogen Inorganic materials 0.000 abstract description 2
239000001257 hydrogen Substances 0.000 abstract description 2
241001062472 Stokellia anisodon Species 0.000 abstract 2
238000000926 separation method Methods 0.000 abstract 1
238000011084 recovery Methods 0.000 description 11
OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 8
UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 7
230000008929 regeneration Effects 0.000 description 7
238000011069 regeneration method Methods 0.000 description 7
238000005406 washing Methods 0.000 description 7
HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
230000008020 evaporation Effects 0.000 description 6
238000004064 recycling Methods 0.000 description 6
229910052717 sulfur Inorganic materials 0.000 description 6
239000011593 sulfur Substances 0.000 description 6
150000003464 sulfur compounds Chemical class 0.000 description 6
CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 5
150000003568 thioethers Chemical class 0.000 description 5
102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 4
235000008733 Citrus aurantifolia Nutrition 0.000 description 4
101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 4
235000011941 Tilia x europaea Nutrition 0.000 description 4
239000006096 absorbing agent Substances 0.000 description 4
150000001412 amines Chemical class 0.000 description 4
PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 4
150000004056 anthraquinones Chemical class 0.000 description 4
239000004571 lime Substances 0.000 description 4
GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 4
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
239000002023 wood Substances 0.000 description 4
QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
238000004061 bleaching Methods 0.000 description 3
239000000571 coke Substances 0.000 description 3
230000007935 neutral effect Effects 0.000 description 3
230000001172 regenerating effect Effects 0.000 description 3
238000005201 scrubbing Methods 0.000 description 3
229910021653 sulphate ion Inorganic materials 0.000 description 3
KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
QPCDCPDFJACHGM-UHFFFAOYSA-N N,N-bis{2-[bis(carboxymethyl)amino]ethyl}glycine Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(=O)O)CCN(CC(O)=O)CC(O)=O QPCDCPDFJACHGM-UHFFFAOYSA-N 0.000 description 2
229920001131 Pulp (paper) Polymers 0.000 description 2
UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 2
230000000740 bleeding effect Effects 0.000 description 2
238000002485 combustion reaction Methods 0.000 description 2
238000001816 cooling Methods 0.000 description 2
238000010438 heat treatment Methods 0.000 description 2
229910000029 sodium carbonate Inorganic materials 0.000 description 2
235000010265 sodium sulphite Nutrition 0.000 description 2
PVXVWWANJIWJOO-UHFFFAOYSA-N 1-(1,3-benzodioxol-5-yl)-N-ethylpropan-2-amine Chemical compound CCNC(C)CC1=CC=C2OCOC2=C1 PVXVWWANJIWJOO-UHFFFAOYSA-N 0.000 description 1
XXQGYGJZNMSSFD-UHFFFAOYSA-N 2-[2-(dimethylcarbamoyl)phenoxy]acetic acid Chemical compound CN(C)C(=O)C1=CC=CC=C1OCC(O)=O XXQGYGJZNMSSFD-UHFFFAOYSA-N 0.000 description 1
102100022443 CXADR-like membrane protein Human genes 0.000 description 1
VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
QMMZSJPSPRTHGB-UHFFFAOYSA-N MDEA Natural products CC(C)CCCCC=CCC=CC(O)=O QMMZSJPSPRTHGB-UHFFFAOYSA-N 0.000 description 1
ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
229910052783 alkali metal Inorganic materials 0.000 description 1
150000001340 alkali metals Chemical class 0.000 description 1
SSQRVOQKVAXHJE-UHFFFAOYSA-N anthracene-9,10-dione;methanol;sulfurous acid Chemical compound OC.OS(O)=O.C1=CC=C2C(=O)C3=CC=CC=C3C(=O)C2=C1 SSQRVOQKVAXHJE-UHFFFAOYSA-N 0.000 description 1
239000007844 bleaching agent Substances 0.000 description 1
150000001720 carbohydrates Chemical class 0.000 description 1
HFNQLYDPNAZRCH-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O.OC(O)=O HFNQLYDPNAZRCH-UHFFFAOYSA-N 0.000 description 1
239000003054 catalyst Substances 0.000 description 1
230000003197 catalytic effect Effects 0.000 description 1
238000009993 causticizing Methods 0.000 description 1
238000006243 chemical reaction Methods 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
230000001419 dependent effect Effects 0.000 description 1
238000003795 desorption Methods 0.000 description 1
230000000694 effects Effects 0.000 description 1
230000007613 environmental effect Effects 0.000 description 1
238000002386 leaching Methods 0.000 description 1
229920005610 lignin Polymers 0.000 description 1
239000007791 liquid phase Substances 0.000 description 1
238000010979 pH adjustment Methods 0.000 description 1
239000000123 paper Substances 0.000 description 1
150000002978 peroxides Chemical class 0.000 description 1
229920001021 polysulfide Polymers 0.000 description 1
229910052700 potassium Inorganic materials 0.000 description 1
239000011591 potassium Substances 0.000 description 1
238000000197 pyrolysis Methods 0.000 description 1
238000010791 quenching Methods 0.000 description 1
238000012958 reprocessing Methods 0.000 description 1
229920006395 saturated elastomer Polymers 0.000 description 1
229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
235000017557 sodium bicarbonate Nutrition 0.000 description 1
UNHKSXOTUHOTAB-UHFFFAOYSA-N sodium;sulfane Chemical compound [Na].S UNHKSXOTUHOTAB-UHFFFAOYSA-N 0.000 description 1
239000002904 solvent Substances 0.000 description 1
230000006641 stabilisation Effects 0.000 description 1
238000011105 stabilization Methods 0.000 description 1
229910052723 transition metal Inorganic materials 0.000 description 1
150000003624 transition metals Chemical class 0.000 description 1

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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/06—Treatment of pulp gases; Recovery of the heat content of the gases; Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO2, e.g. arising from liquors containing sulfur compounds
- D21C11/08—Deodorisation ; Elimination of malodorous compounds, e.g. sulfur compounds such as hydrogen sulfide or mercaptans, from gas streams
- 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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
- D21C11/0071—Treatment of green or white liquors with gases, e.g. with carbon dioxide for carbonation; Expulsion of gaseous compounds, e.g. hydrogen sulfide, from these liquors by this treatment (stripping); Optional separation of solid compounds formed in the liquors by this treatment
- 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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/12—Combustion of pulp liquors
- D21C11/125—Decomposition of the pulp liquors in reducing atmosphere or in the absence of oxidants, i.e. gasification or pyrolysis
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills

Landscapes

Paper (AREA)
Cookers (AREA)
Compounds Of Unknown Constitution (AREA)
Treating Waste Gases (AREA)

SE9303137A 1993-09-27 1993-09-27 Beredning av sulfitinnehållande kokvätska och användning av kokvätskan för förimpregnering SE503455C2 (sv)

Priority Applications (7)

Application Number	Priority Date	Filing Date	Title
SE9303137A SE503455C2 (sv)	1993-09-27	1993-09-27	Beredning av sulfitinnehållande kokvätska och användning av kokvätskan för förimpregnering
DE69419024T DE69419024T2 (de)	1993-09-27	1994-09-05	Herstellung einer sulfit-enthaltenden kochlauge
PCT/SE1994/000816 WO1995009269A1 (en)	1993-09-27	1994-09-05	Preparation of cooking liquor containing sulphite
AT94928525T ATE181119T1 (de)	1993-09-27	1994-09-05	Herstellung einer sulfit-enthaltenden kochlauge
CA002171748A CA2171748C (en)	1993-09-27	1994-09-05	Preparation of cooking liquor containing sulphite
EP94928525A EP0721527B1 (de)	1993-09-27	1994-09-05	Herstellung einer sulfit-enthaltenden kochlauge
AU77927/94A AU7792794A (en)	1993-09-27	1994-09-05	Preparation of cooking liquor containing sulphite

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
SE9303137A SE503455C2 (sv)	1993-09-27	1993-09-27	Beredning av sulfitinnehållande kokvätska och användning av kokvätskan för förimpregnering

Publications (3)

Publication Number	Publication Date
SE9303137D0 SE9303137D0 (sv)	1993-09-27
SE9303137L SE9303137L (sv)	1995-03-28
SE503455C2 true SE503455C2 (sv)	1996-06-17

Family

ID=20391220

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
SE9303137A SE503455C2 (sv)	1993-09-27	1993-09-27	Beredning av sulfitinnehållande kokvätska och användning av kokvätskan för förimpregnering

Country Status (7)

Country	Link
EP (1)	EP0721527B1 (de)
AT (1)	ATE181119T1 (de)
AU (1)	AU7792794A (de)
CA (1)	CA2171748C (de)
DE (1)	DE69419024T2 (de)
SE (1)	SE503455C2 (de)
WO (1)	WO1995009269A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
SE9703365D0 (sv) *	1997-09-18	1997-09-18	Kvaerner Pulping Tech	Method in connection with impregnation and digestion of lignocelulosic material
SE0103241D0 (sv) *	2001-09-28	2001-09-28	Skogsind Tekn Foskningsinst	Method for recovery of pulping chemicals in an alkaline sulphite pulping process and for production of steam
CN116064167B (zh) *	2021-10-30	2025-05-02	中国石油化工股份有限公司	一种生物质制合成气的方法和系统

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3353906A (en) *	1964-08-25	1967-11-21	Lummus Co	Method of recovering chemicals from spent pulping liquors
FI63790C (fi) *	1982-02-11	1983-08-10	Ahlstroem Oy	Saett att reglera matningscirkulationens alkalitet vid foerhydrolysering av traeflis
SE500263C2 (sv) *	1993-03-11	1994-05-24	Chemrec Ab	Process för separation av svavelföreningar ur en koldioxid- och vätesulfidinnehållande gasström

1993
- 1993-09-27 SE SE9303137A patent/SE503455C2/sv not_active IP Right Cessation
1994
- 1994-09-05 AU AU77927/94A patent/AU7792794A/en not_active Abandoned
- 1994-09-05 EP EP94928525A patent/EP0721527B1/de not_active Expired - Lifetime
- 1994-09-05 AT AT94928525T patent/ATE181119T1/de not_active IP Right Cessation
- 1994-09-05 CA CA002171748A patent/CA2171748C/en not_active Expired - Fee Related
- 1994-09-05 WO PCT/SE1994/000816 patent/WO1995009269A1/en not_active Ceased
- 1994-09-05 DE DE69419024T patent/DE69419024T2/de not_active Expired - Lifetime

Also Published As

Publication number	Publication date
CA2171748C (en)	2005-03-22
AU7792794A (en)	1995-04-18
SE9303137L (sv)	1995-03-28
EP0721527A1 (de)	1996-07-17
WO1995009269A1 (en)	1995-04-06
DE69419024T2 (de)	2000-02-03
DE69419024D1 (de)	1999-07-15
EP0721527B1 (de)	1999-06-09
ATE181119T1 (de)	1999-06-15
CA2171748A1 (en)	1995-04-06
SE9303137D0 (sv)	1993-09-27

Legal Events

Date	Code	Title	Description
2013-10-29	NUG	Patent has lapsed

Publication	Publication Date	Title
US4053352A (en)	1977-10-11	Method for producing oxidized white liquor
RU2126863C1 (ru)	1999-02-27	Способ отделения серных соединений (варианты)
US6027609A (en)	2000-02-22	Pulp-mill recovery installation for recovering chemicals and energy from cellulose spent liquor using multiple gasifiers
SE461534B (sv)	1990-02-26	Foerfarande foer framstaellning av kokvaetska samt kokvaetska foer kraftmassakokning
US6143130A (en)	2000-11-07	Polysulfide pulping process
US3650888A (en)	1972-03-21	Pollution controlled polysulfide recovery process
US1689534A (en)	1928-10-30	Cyclic process for the manufacture of kraft pulp
FI130066B (en)	2023-01-31	A method for replacing sodium losses in a pulp mill and a method for producing bleached cellulose pulp
US3617434A (en)	1971-11-02	Regeneration of cooking chemicals from spent alkaline cooking liquor
JPH07122226B2 (ja)	1995-12-25	セルロースの製造
CA1107009A (en)	1981-08-18	Device for recovering sodium chemicals from green liquor and flue gases
SE503455C2 (sv)	1996-06-17	Beredning av sulfitinnehållande kokvätska och användning av kokvätskan för förimpregnering
US5326433A (en)	1994-07-05	Multi-level sulfide content white liquor production and utilization in cellulose pulping
SE506702C2 (sv)	1998-02-02	Förbehandling av fibermaterial med in situ bildad vätesulfid
US3650889A (en)	1972-03-21	Pollution controlled polysulfide recovery process
CA2103664C (en)	1997-08-19	Method of recovering energy and chemicals from black liquor
US3525666A (en)	1970-08-25	Process for preparing kraft pulping liquor from black liquor including separate carbonation with combustion gases and evaporation steps
US5507912A (en)	1996-04-16	Kraft pulping process wherein sulphide-rich and sulphide-lean white liquors are generated
WO1996014468A1 (en)	1996-05-17	Selective recovery of chemicals from cellulose spent liquor by liquor gasifying
WO1999014423A1 (en)	1999-03-25	Polysulfide pulping process
CA1041708A (en)	1978-11-07	Separating sulphur in the form of hydrogen sulphide from clarified green liquor
US20040194900A1 (en)	2004-10-07	Method for recovery of pulping chemicals in an alkaline sulphite pulping process and for production of steam
US1795754A (en)	1931-03-10	Production of chemical pulp, etc.
US3248169A (en)	1966-04-26	Method of regenerating sodium sulfite waste liquors
PATT et al.	1997	3 The ASAM Process