GB384455A - An improved process of producing sulphite cellulose - Google Patents

An improved process of producing sulphite cellulose

Info

Publication number
GB384455A
GB384455A GB36000/31A GB3600031A GB384455A GB 384455 A GB384455 A GB 384455A GB 36000/31 A GB36000/31 A GB 36000/31A GB 3600031 A GB3600031 A GB 3600031A GB 384455 A GB384455 A GB 384455A
Authority
GB
United Kingdom
Prior art keywords
solution
hours
digestion
liquor
digester
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.)
Expired
Application number
GB36000/31A
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.)
PATENTAKTIEBOLAGET GRONDAL RAM
Original Assignee
PATENTAKTIEBOLAGET GRONDAL RAM
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 PATENTAKTIEBOLAGET GRONDAL RAM filed Critical PATENTAKTIEBOLAGET GRONDAL RAM
Publication of GB384455A publication Critical patent/GB384455A/en
Expired legal-status Critical Current

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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/26—Multistage processes

Landscapes

  • Paper (AREA)

Abstract

384,455. Sulphite pulp digestion. PATENTAKTIEBOLAGET GRONDALRAMEN, 28, Jakobsbergsgatan, Stockholm. Dec. 30, 1931, No. 36000. Convention date, Jan. 9. [Class 96.] Wood chips &c. are partially digested with a solution of an alkali metal bisulphate or with a nearly neutral solution thereof and an alkali metal monosulphite without added sulphurous acid and digestion completed with the chips &c. submerged in liquor containing sufficient free SO2. The first solution may be preheated and circulated for one or more hours with indirect heating to 120‹ C. The liquor may be drawnoff until the digester is “-full and the second solution introduced cold under pressure due to liberation of SO2 therefrom. Circulation and heat are again applied for 5-10 hours. The process is stated to save time and avoid the formation of thio-sulphates, sulphates, sulphuric acid, and sulphur, with reduced risk of " black digestion." In an example a 100 cu. metre digester is charged with 25 tons of wood chips and 3350 kgm. of NaHSO3 in 25 cu. metres of water circulated at 135‹ C. and 2À5 atmospheres for 5 hours, and then partly replaced by 60-65 cu. metres of liquor containing waste liquor and/or washing water.
GB36000/31A 1931-01-09 1931-12-30 An improved process of producing sulphite cellulose Expired GB384455A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE384455X 1931-01-09

Publications (1)

Publication Number Publication Date
GB384455A true GB384455A (en) 1932-12-08

Family

ID=20309224

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36000/31A Expired GB384455A (en) 1931-01-09 1931-12-30 An improved process of producing sulphite cellulose

Country Status (4)

Country Link
US (1) US1940136A (en)
DE (1) DE564738C (en)
FR (1) FR713809A (en)
GB (1) GB384455A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851355A (en) * 1951-02-28 1958-09-09 Waldhof Zellstoff Fab Process for the preparation of semi-cellulose

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885317A (en) * 1954-03-30 1959-05-05 Stora Kopparbergs Bergslags Ab Method in manufacturing chemical or semi-chemical pulp from heavily resinous wood
US3046184A (en) * 1958-12-31 1962-07-24 Kimberly Clark Co Manufacture of cellulosic products
DE2445523A1 (en) * 1974-09-24 1976-04-01 Waldhof Aschaffenburg Papier METHOD FOR MANUFACTURING PULP

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851355A (en) * 1951-02-28 1958-09-09 Waldhof Zellstoff Fab Process for the preparation of semi-cellulose

Also Published As

Publication number Publication date
US1940136A (en) 1933-12-19
FR713809A (en) 1931-11-03
DE564738C (en) 1932-11-23

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