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GB987612A - Sulphite pulping process - Google Patents

Sulphite pulping process

Info

Publication number
GB987612A
GB987612A GB13458/61A GB1345861A GB987612A GB 987612 A GB987612 A GB 987612A GB 13458/61 A GB13458/61 A GB 13458/61A GB 1345861 A GB1345861 A GB 1345861A GB 987612 A GB987612 A GB 987612A
Authority
GB
United Kingdom
Prior art keywords
digestion
magnesium
temperature
digesting
pulping process
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
GB13458/61A
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.)
SMITH PAPER MILLS Ltd HOWARD
Original Assignee
SMITH PAPER MILLS Ltd HOWARD
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 SMITH PAPER MILLS Ltd HOWARD filed Critical SMITH PAPER MILLS Ltd HOWARD
Publication of GB987612A publication Critical patent/GB987612A/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
    • D21C3/266—Multistage processes the same pulping agent being used in all stages

Landscapes

  • Paper (AREA)

Abstract

Pulp is produced from cellulosic raw material by digesting with aqueous magnesium bisulphite solution initially having a pH of 2.5-5.0, the major portion of the digestion being carried out at a temperature of 150-200 DEG C. and a pH of 3-4, the digestion being completed by raising the pH to a value in the range 4. 75-6.5 by the addition of an aqueous suspension of magnesium hydroxide to the digesting liquor. The pressure and temperature are preferably increased during completion of the digestion. The residual liquor may be concentrated by evaporation and burnt to form sulphur dioxide and magnesium oxide from which magnesium bisulphate is reconstituted and recycled to the process (Fig. 1, not shown).
GB13458/61A 1960-04-27 1961-04-14 Sulphite pulping process Expired GB987612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24927A US3092535A (en) 1960-04-27 1960-04-27 Sulphite pulping process

Publications (1)

Publication Number Publication Date
GB987612A true GB987612A (en) 1965-03-31

Family

ID=21823076

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13458/61A Expired GB987612A (en) 1960-04-27 1961-04-14 Sulphite pulping process

Country Status (6)

Country Link
US (1) US3092535A (en)
AT (1) AT249496B (en)
DE (1) DE1300822C2 (en)
FI (1) FI40850B (en)
FR (1) FR1287891A (en)
GB (1) GB987612A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844879A (en) * 1972-10-30 1974-10-29 Babcock & Wilcox Co System for removing sodium chloride contaminants from a magnesium base pulping process
FI75615C (en) * 1985-11-29 1991-08-26 Ahlstroem Oy FOERFARANDE FOER SAENKNING AV SVARTLUTENS VISKOSITET.
US4963231A (en) * 1988-06-13 1990-10-16 Ahlstromforetagen Svenska Ab Method for evaporation of liquids
CN114851332B (en) * 2022-05-31 2023-02-17 东北林业大学 Preparation method of wood robot with magnetic anisotropy

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1864620A (en) * 1931-02-18 1932-06-28 Brown Co Process of liberating pulp from raw cellulosic materials
GB400974A (en) * 1932-03-04 1933-11-06 Henry Dreyfus Improvements in or relating to the production of cellulosic materials or cellulose
GB459531A (en) * 1935-07-10 1937-01-11 Henry Dreyfus Improvements in or relating to the manufacture of cellulose
US2385955A (en) * 1941-04-08 1945-10-02 George H Tomlinson Manufacture of sulphite pulp
BE496841A (en) * 1949-07-12
US2730445A (en) * 1952-03-21 1956-01-10 Sivola George Integrated lignocellulose digestion and recovery process
US3046182A (en) * 1956-01-13 1962-07-24 Smith Paper Mills Ltd Howard Sulphite pulping process

Also Published As

Publication number Publication date
DE1300822C2 (en) 1975-01-09
DE1300822B (en) 1975-01-09
FR1287891A (en) 1962-03-16
US3092535A (en) 1963-06-04
AT249496B (en) 1966-09-26
FI40850B (en) 1969-02-28

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