SE335053B - - Google Patents

Info

Publication number
SE335053B
SE335053B SE06780/69A SE678069A SE335053B SE 335053 B SE335053 B SE 335053B SE 06780/69 A SE06780/69 A SE 06780/69A SE 678069 A SE678069 A SE 678069A SE 335053 B SE335053 B SE 335053B
Authority
SE
Sweden
Prior art keywords
cellulose
hemicellulose
oxygen
magnesium
dissolution
Prior art date
Application number
SE06780/69A
Inventor
H Samuelson
S Noreus
Original Assignee
Mo Och Domsjoe 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
Application filed by Mo Och Domsjoe Ab filed Critical Mo Och Domsjoe Ab
Priority to SE06780/69A priority Critical patent/SE335053B/xx
Priority to FI700982A priority patent/FI45575C/en
Priority to FR7016642A priority patent/FR2047420A5/fr
Priority to NO01766/70A priority patent/NO128372B/no
Priority to DE2022866A priority patent/DE2022866C3/en
Priority to US36670A priority patent/US3652385A/en
Priority to AT434170A priority patent/AT295997B/en
Publication of SE335053B publication Critical patent/SE335053B/xx

Links

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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • 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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp

Abstract

Cellulosic materials from which metal ions have been removed by acids or complexing agents is delignified with alkali in the presence of oxygen, and particularly air, and in the presence of magnesium compounds such as, for instance, chelates of magnesium and aliphatic alpha- and beta-hydroxycarboxylic acids. The invention is of particular application to the reduction of lignin content in cellulose pulps without causing deleterious degradation of the cellulose, the magnesium compounds reducing or entirely preventing attack of oxygen on the hemicellulose and cellulose carbohydrates, without appreciably diminishing the oxidation of the lignin and its dissolution in the course of the process. The process is also useful to obtain a controlled dissolution of the hemicellulose.
SE06780/69A 1969-05-13 1969-05-13 SE335053B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
SE06780/69A SE335053B (en) 1969-05-13 1969-05-13
FI700982A FI45575C (en) 1969-05-13 1970-04-08 Method of handling a cellulosic material.
FR7016642A FR2047420A5 (en) 1969-05-13 1970-05-06
NO01766/70A NO128372B (en) 1969-05-13 1970-05-09
DE2022866A DE2022866C3 (en) 1969-05-13 1970-05-11 Process for bleaching cellulosic material
US36670A US3652385A (en) 1969-05-13 1970-05-12 Process for treating cellulosic materials from which metal ions have been removed with alkali and oxygen in the presence of complex magnesium salts
AT434170A AT295997B (en) 1969-05-13 1970-05-13 Process for the treatment of cellulosic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE06780/69A SE335053B (en) 1969-05-13 1969-05-13

Publications (1)

Publication Number Publication Date
SE335053B true SE335053B (en) 1971-05-10

Family

ID=20269591

Family Applications (1)

Application Number Title Priority Date Filing Date
SE06780/69A SE335053B (en) 1969-05-13 1969-05-13

Country Status (7)

Country Link
US (1) US3652385A (en)
AT (1) AT295997B (en)
DE (1) DE2022866C3 (en)
FI (1) FI45575C (en)
FR (1) FR2047420A5 (en)
NO (1) NO128372B (en)
SE (1) SE335053B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997017489A1 (en) * 1994-05-10 1997-05-15 Stora Kopparbergs Bergslags Ab Process for oxygen delignification

Families Citing this family (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE355614B (en) * 1970-05-13 1973-04-30 Mo Och Domsjoe Ab
US4182648A (en) * 1972-02-07 1980-01-08 Sterling Drug Inc. Oxygen pulping process
JPS502641B2 (en) * 1972-03-23 1975-01-28
US4004967A (en) * 1972-06-22 1977-01-25 Billeruds Aktiebolag Bleaching cellulose pulp with oxygen in the presence of formaldehyde
SE373896B (en) * 1972-07-05 1975-02-17 Mo Och Domsjoe Ab
GB1505529A (en) * 1974-06-14 1978-03-30 Mo Och Domsjoe Ab Method for the oxygen-gas delignification of lignocellulosic material and apparatus for carrying out the method
US4187141A (en) * 1975-02-24 1980-02-05 Alf Societe Anonyme Method of producing bleached mechanical pulp
US4172006A (en) * 1976-08-26 1979-10-23 Weyerhaeuser Company Method of delignifying wood chips with oxygen by adding cooking liquor under pressure
SE417114B (en) * 1977-07-25 1981-02-23 Mo Och Domsjoe Ab PROCEDURE FOR PREVENTION OF INSTRUCTIVE EDUCATION IN CELLULOS FACTORIES
US4181516A (en) * 1977-08-22 1980-01-01 Gray Kenneth R Products for correcting iron chlorosis in plants
SE420430B (en) * 1978-02-17 1981-10-05 Mo Och Domsjoe Ab PROCEDURE FOR WHEATING AND EXTRACTION OF LIGNOCELLULOSALLY MATERIALS WITH PEROXID CONTAINING BLACKS
DE2841013C2 (en) * 1978-09-21 1984-06-07 Degussa Ag, 6000 Frankfurt Process for full bleaching of pulp
US4594130A (en) * 1978-11-27 1986-06-10 Chang Pei Ching Pulping of lignocellulose with aqueous alcohol and alkaline earth metal salt catalyst
US4238282A (en) * 1979-07-23 1980-12-09 Nalco Chemical Company Chemical treatments in bleaching stages which increase pulp brightness
US6398908B1 (en) 1991-04-30 2002-06-04 Eka Nobel Ab Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound
SE470065C (en) * 1991-04-30 1995-10-12 Eka Nobel Ab Treatment of chemical pulp with an acid and then a magnesium and calcium compound in chlorine-free bleaching
CA2082557C (en) * 1992-02-24 1997-03-11 Charles W. Hankins Integrated pulping process of waste paper yielding tissue-grade paper fibers
SE502667C2 (en) * 1993-07-12 1995-12-04 Kvaerner Pulping Tech Treatment of fiber material with complexing agents before cooking
US6306334B1 (en) 1996-08-23 2001-10-23 The Weyerhaeuser Company Process for melt blowing continuous lyocell fibers
US6210801B1 (en) * 1996-08-23 2001-04-03 Weyerhaeuser Company Lyocell fibers, and compositions for making same
US6471727B2 (en) 1996-08-23 2002-10-29 Weyerhaeuser Company Lyocell fibers, and compositions for making the same
US6605350B1 (en) 1996-08-23 2003-08-12 Weyerhaeuser Company Sawdust alkaline pulp having low average degree of polymerization values and method of producing the same
US6331354B1 (en) 1996-08-23 2001-12-18 Weyerhaeuser Company Alkaline pulp having low average degree of polymerization values and method of producing the same
EP1161592B1 (en) 1999-02-15 2004-09-22 Kiram AB Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals
US6686039B2 (en) 1999-02-24 2004-02-03 Weyerhaeuser Company Use of thinnings and other low specific gravity wood for lyocell pulps
US6797113B2 (en) * 1999-02-24 2004-09-28 Weyerhaeuser Company Use of thinnings and other low specific gravity wood for lyocell pulps method
US6685856B2 (en) 1999-02-24 2004-02-03 Weyerhaeuser Company Use of thinnings and other low specific gravity wood for lyocell products method
US6686040B2 (en) 1999-02-24 2004-02-03 Weyerhaeuser Company Use of thinnings and other low specific gravity wood for lyocell products
EP1244840A4 (en) * 1999-06-08 2003-04-16 Eastern Pulp And Paper Corp Bleaching pulp with high-pressure o 2?
WO2001059204A1 (en) * 2000-02-14 2001-08-16 Kiram Ab Process for oxygen pulping of lignocellulosic material and recovery of pulping chemicals
WO2010139589A1 (en) * 2009-06-02 2010-12-09 Akzo Nobel Chemicals International B.V. Process for producing mechanical pulp
CN106968127B (en) 2012-04-18 2019-03-01 Gp纤维素股份有限公司 Needlebush kraft pulp for viscose solution
IN2014MU01296A (en) * 2014-04-07 2015-10-09 Praj Ind Ltd
EP3356596A1 (en) * 2015-09-30 2018-08-08 Imerys Minerals Limited Methods for bleaching aqueous pulps and compositions for use in these methods
CA3075264A1 (en) 2017-09-08 2019-03-14 Dte Materials Incorporated Selectively depolymerizing cellulosic materials for use as thermal and acoustic insulators

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1987195A (en) * 1934-03-03 1935-01-08 Herman B Kipper Process for the digestion of vegetable growths to produce cellulose
GB576510A (en) * 1944-03-16 1946-04-08 Henry Dreyfus Improvements in or relating to the production of cellulose
GB681994A (en) * 1949-05-31 1952-11-05 British Celanese Improvements in or relating to the production of cellulose
US2862784A (en) * 1955-03-04 1958-12-02 Virginia Smelting Company Oxidative-reductive multi-stage bleaching of ground wood pulp
US2811518A (en) * 1955-06-07 1957-10-29 Rayonier Inc Alkaline refining of wood pulp
US3023140A (en) * 1958-11-24 1962-02-27 Bauer Bros Co Pulp bleaching
US3088861A (en) * 1960-08-03 1963-05-07 Weyerhaeuser Co Method of manufacturing chemical pulp from lignocellulose material
US3069309A (en) * 1961-02-01 1962-12-18 Du Pont Pulp bleaching
US3251731A (en) * 1963-02-11 1966-05-17 Andrew J Gard Bleaching of wood pulp with a sequestering agent and hydrogen peroxide
FR1387853A (en) * 1963-09-19 1965-02-05 Air Liquide Delignification and bleaching of chemical and semi-chemical cellulose pulps
US3382149A (en) * 1964-10-29 1968-05-07 Du Pont Bleaching of hardwood sulfite pulp with hydrogen peroxide, including pretreatment with alkali

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997017489A1 (en) * 1994-05-10 1997-05-15 Stora Kopparbergs Bergslags Ab Process for oxygen delignification

Also Published As

Publication number Publication date
DE2022866B2 (en) 1974-03-28
NO128372B (en) 1973-11-05
DE2022866A1 (en) 1970-12-23
DE2022866C3 (en) 1974-11-14
FI45575C (en) 1972-07-10
AT295997B (en) 1972-01-25
US3652385A (en) 1972-03-28
FR2047420A5 (en) 1971-03-12
FI45575B (en) 1972-04-04

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