GB490101A - Process for obtaining cellulose from vegetable raw materials - Google Patents

Process for obtaining cellulose from vegetable raw materials

Info

Publication number
GB490101A
GB490101A GB2310437A GB2310437A GB490101A GB 490101 A GB490101 A GB 490101A GB 2310437 A GB2310437 A GB 2310437A GB 2310437 A GB2310437 A GB 2310437A GB 490101 A GB490101 A GB 490101A
Authority
GB
United Kingdom
Prior art keywords
acid
per cent
hours
centrifuging
cent strength
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
GB2310437A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2310437A priority Critical patent/GB490101A/en
Publication of GB490101A publication Critical patent/GB490101A/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
    • D21C3/16—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides nitrogen oxides; nitric acid nitrates, nitrites

Landscapes

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

Abstract

For obtaining cellulose suitable for good quality paper from wood, straw, and other vegetable materials, nitric acid of 2-10 per cent strength is allowed to act upon the chopped and cleaned raw material for 4-12 hours at room temperature, the material is removed from the acid and drained and then after freeing it from about half the remaining adherent acid by centrifuging or pressing, is heated with stirring in a vessel preventing ingress of air, but at atmospheric pressure and at 60-100 DEG C. for 1-3 hours. Finally the material is washed, treated with hot alkaline liquid, e.g. 2 per cent soda solution for 2 hours and bleached. The heating with acid is performed in a closed steel vessel provided with a sensitive valve which prevents ingress of air and raising of the internal pressure above that of the atmosphere. The acid remaining in the material increases in concentration during the heat treatment, and by restricting the amount of water for the first washing, and then centrifuging, the centrifuged liquid may be re-used if desired after addition of concentrated nitric acid. The initial impregnation may be performed in two stages, first with acid of 2-4 per cent strength and then with acid of 5-10 per cent strength.
GB2310437A 1937-08-23 1937-08-23 Process for obtaining cellulose from vegetable raw materials Expired GB490101A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2310437A GB490101A (en) 1937-08-23 1937-08-23 Process for obtaining cellulose from vegetable raw materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2310437A GB490101A (en) 1937-08-23 1937-08-23 Process for obtaining cellulose from vegetable raw materials

Publications (1)

Publication Number Publication Date
GB490101A true GB490101A (en) 1938-08-09

Family

ID=10190162

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2310437A Expired GB490101A (en) 1937-08-23 1937-08-23 Process for obtaining cellulose from vegetable raw materials

Country Status (1)

Country Link
GB (1) GB490101A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539093A (en) * 1944-09-07 1951-01-23 Mainguet Henri Nitric acid digestion of straw

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539093A (en) * 1944-09-07 1951-01-23 Mainguet Henri Nitric acid digestion of straw

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