GB490101A - Process for obtaining cellulose from vegetable raw materials - Google Patents
Process for obtaining cellulose from vegetable raw materialsInfo
- 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
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2539093A (en) * | 1944-09-07 | 1951-01-23 | Mainguet Henri | Nitric acid digestion of straw |
-
1937
- 1937-08-23 GB GB2310437A patent/GB490101A/en not_active Expired
Cited By (1)
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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