GB252344A - Improvements in the production of cellulose pulp - Google Patents

Improvements in the production of cellulose pulp

Info

Publication number
GB252344A
GB252344A GB10972/26A GB1097226A GB252344A GB 252344 A GB252344 A GB 252344A GB 10972/26 A GB10972/26 A GB 10972/26A GB 1097226 A GB1097226 A GB 1097226A GB 252344 A GB252344 A GB 252344A
Authority
GB
United Kingdom
Prior art keywords
wood
preparation
sulphur dioxide
production
cellulose pulp
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
GB10972/26A
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.)
Raoul Pictet & F Tharaldsen As
Original Assignee
Raoul Pictet & F Tharaldsen As
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 Raoul Pictet & F Tharaldsen As filed Critical Raoul Pictet & F Tharaldsen As
Publication of GB252344A publication Critical patent/GB252344A/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
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites

Landscapes

  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

252,344. Aktieselskabet R. Pictet & F. Tharaldsen. May 20, 1925, [Convention date]. Pulp, preparation of.-In the preparation of wood cellulose, the duration of the process is reduced, the colour of the product improved, and the yield increased by treating the raw material at 8 atmospheres pressure and at a temperature not exceeding 110‹ C. with a highly concentrated aqueous solution of sulphurous acid containing more than 100 grams of sulphur dioxide per litre. Under these conditions the process is completed in 8-16 hours. The digester is preferably first exhausted to remove air from the pores of the wood. The sulphur dioxide uncombined with the wood can be recovered, and, after purification, may be reabsorbed in water for subsequent treatments.
GB10972/26A 1925-05-20 1926-04-26 Improvements in the production of cellulose pulp Expired GB252344A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO252344X 1925-05-20

Publications (1)

Publication Number Publication Date
GB252344A true GB252344A (en) 1926-12-09

Family

ID=19905010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10972/26A Expired GB252344A (en) 1925-05-20 1926-04-26 Improvements in the production of cellulose pulp

Country Status (3)

Country Link
DE (1) DE504667C (en)
FR (1) FR616229A (en)
GB (1) GB252344A (en)

Also Published As

Publication number Publication date
FR616229A (en) 1927-01-29
DE504667C (en) 1930-08-08

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