GB771571A - Improvements in or relating to the pulping of wood chips - Google Patents

Improvements in or relating to the pulping of wood chips

Info

Publication number
GB771571A
GB771571A GB20475/54A GB2047554A GB771571A GB 771571 A GB771571 A GB 771571A GB 20475/54 A GB20475/54 A GB 20475/54A GB 2047554 A GB2047554 A GB 2047554A GB 771571 A GB771571 A GB 771571A
Authority
GB
United Kingdom
Prior art keywords
sulphur dioxide
hours
solution
chips
per cent
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
GB20475/54A
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.)
Abitibi Power and Paper Co Ltd
Original Assignee
Abitibi Power and Paper Co Ltd
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 Abitibi Power and Paper Co Ltd filed Critical Abitibi Power and Paper Co Ltd
Publication of GB771571A publication Critical patent/GB771571A/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)

Abstract

In a semi-chemical pulping process, wood chips ar cooked up to 155 DEG C. at a pH of 3-5 with a solution of sodium, potassium or ammonium bisulphite having no free sulphur dioxide, and then mechanically refining to separate the fibres. By "free sulphur dioxide" is meant sulphur dioxide other than that present as bisulphite. In an example, a digester was charged with 1 part by weight of spruce chips and 5 parts of a solution of sodium metabisulphite to give a total sulphur dioxide content of 2.5 per cent. The temperature was raised to 110 DEG C. during 2 hours, to 155 DEG C. during 2 1/2 hours and maintained at 155 DEG C. for a further 1 1/2 hours. The initial pH value was 4.7 and the final pH, 3.5. The yield was 74 per cent. The cork was blown, the softened chips washed and passed through a disc refiner. Alternatively, the cooking liquor could be prepared from a solution of soda ash and sulphur dioxide gas.
GB20475/54A 1953-07-13 1954-07-13 Improvements in or relating to the pulping of wood chips Expired GB771571A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA771571X 1953-07-13
CA2906659X 1953-07-13

Publications (1)

Publication Number Publication Date
GB771571A true GB771571A (en) 1957-04-03

Family

ID=32963120

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20475/54A Expired GB771571A (en) 1953-07-13 1954-07-13 Improvements in or relating to the pulping of wood chips

Country Status (2)

Country Link
US (1) US2906659A (en)
GB (1) GB771571A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3013934A (en) * 1958-08-12 1961-12-19 West Virginia Pulp & Paper Co High yield pulp from hardwoods
US3095265A (en) * 1958-11-03 1963-06-25 Pritchard & Co J F Ion exchange process for recovery of monovalent ions from waste sulfite pulping liquor
US3046184A (en) * 1958-12-31 1962-07-24 Kimberly Clark Co Manufacture of cellulosic products
CA1075857A (en) * 1976-02-20 1980-04-22 Price Company Limited (The) Chemical pretreatment of wood prior to making refiner groundwood
CN115874477B (en) * 2021-09-29 2024-04-09 武夷学院 Water-soluble fertilizer product prepared from pulping byproducts and application thereof

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1880042A (en) * 1929-10-26 1932-09-27 Brown Co Acid process of fiber liberation
US2454533A (en) * 1940-08-03 1948-11-23 Wood Conversion Co Manufacture of fibrous products deriving from lignocellulose
US2425024A (en) * 1942-11-21 1947-08-05 Paper And Ind Appliances Inc Apparatus for producing pulp from cellulosic material
BE496841A (en) * 1949-07-12
NL90306C (en) * 1951-02-28

Also Published As

Publication number Publication date
US2906659A (en) 1959-09-29

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