GB1042151A - Production of sulphate cellulose - Google Patents

Production of sulphate cellulose

Info

Publication number
GB1042151A
GB1042151A GB8372/63A GB837263A GB1042151A GB 1042151 A GB1042151 A GB 1042151A GB 8372/63 A GB8372/63 A GB 8372/63A GB 837263 A GB837263 A GB 837263A GB 1042151 A GB1042151 A GB 1042151A
Authority
GB
United Kingdom
Prior art keywords
sulphate
liquor
sulphide
pretreatment
digestion
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
GB8372/63A
Inventor
Erik Oman
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.)
Skogsagarnas Industri AB
Original Assignee
Skogsagarnas Industri 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
Priority to DES83903A priority Critical patent/DE1296503B/en
Application filed by Skogsagarnas Industri AB filed Critical Skogsagarnas Industri AB
Priority to GB8372/63A priority patent/GB1042151A/en
Priority to FR927299A priority patent/FR1450380A/en
Publication of GB1042151A publication Critical patent/GB1042151A/en
Priority to US640501A priority patent/US3397109A/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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds

Landscapes

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

Abstract

In a modification of the sulphate process for separating cellulose from wood-pulp and the like, sodium hydroxide free from sulphide is obtained from a "melt-soda" comprising sodium carbonate and sulphide. The "melt-soda" is treated with a quantity of water sufficient to dissolve all the sodium sulphide, but leave more than half the sodium carbonate undissolved. This dissolving process can be carried out continuously by the countercurrent method. The undissolved sodium carbonate can then be dissolved in and recrystallized from a further quantity of water, and then redissolved and causticized.ALSO:In the treatment of cellulosic fibrous material by the sulphate process, the formation of malodourous substances such as methyl mercaptan, methyl sulphide and methyl disulphide is prevented by a pretreatment of the material with an alkaline liquor before the digestion with the sulphate liquor. The alkali used may be sodium hydroxide or a black liquor from a previous sulphate digestion. The pretreatment liquor may be wholly or partially separated from the fibrous material before the sulphate liquor is added. The pretreatment may be carried out in the digestion vessel or in a separate vessel.
GB8372/63A 1963-03-01 1963-03-01 Production of sulphate cellulose Expired GB1042151A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DES83903A DE1296503B (en) 1963-03-01 1963-02-26 Process to avoid the formation of volatile, malodorous substances in the manufacture of sulphate pulp
GB8372/63A GB1042151A (en) 1963-03-01 1963-03-01 Production of sulphate cellulose
FR927299A FR1450380A (en) 1963-03-01 1963-03-08 Process for preparing sulphate cellulose
US640501A US3397109A (en) 1963-03-01 1967-05-23 Alkali pretreatment in sulfate process to prevent malodors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8372/63A GB1042151A (en) 1963-03-01 1963-03-01 Production of sulphate cellulose

Publications (1)

Publication Number Publication Date
GB1042151A true GB1042151A (en) 1966-09-14

Family

ID=9851271

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8372/63A Expired GB1042151A (en) 1963-03-01 1963-03-01 Production of sulphate cellulose

Country Status (4)

Country Link
US (1) US3397109A (en)
DE (1) DE1296503B (en)
FR (1) FR1450380A (en)
GB (1) GB1042151A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5489363A (en) * 1993-05-04 1996-02-06 Kamyr, Inc. Pulping with low dissolved solids for improved pulp strength

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1880044A (en) * 1930-02-28 1932-09-27 Brown Co Process of alkaline fiber liberation
US3035963A (en) * 1958-02-19 1962-05-22 Lummus Co Process for the continuous digestion of cellulosic materials

Also Published As

Publication number Publication date
DE1296503B (en) 1969-05-29
FR1450380A (en) 1966-06-24
US3397109A (en) 1968-08-13

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