GB438433A - Improvements in the manufacture of cellulose - Google Patents
Improvements in the manufacture of celluloseInfo
- Publication number
- GB438433A GB438433A GB1477734A GB1477734A GB438433A GB 438433 A GB438433 A GB 438433A GB 1477734 A GB1477734 A GB 1477734A GB 1477734 A GB1477734 A GB 1477734A GB 438433 A GB438433 A GB 438433A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alkali
- acid
- treatment
- wood
- nitric acid
- 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
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
To prevent deterioration of the cellulose during the extraction of wood, wood pulps &c. with nitric acid, the latter contains a substance resulting from the treatment of a lignocellulose material with nitric acid. The acid may be obtained by heating a nitric acid solution with wood substance, and then bringing the acid to the desired concentration by the addition of water or acid; and the acid employed for the extraction may be used repeatedly after suitable adjustment of its concentration. In a p modification, there is added to chemical wood pulp to be refined, finely divided raw wood or mechanical pulp, and the whole treated with nitric acid solution. The acid treatment may be followed by a treatment with alkali, in particular with dilute alkali at an elevated temperature, and such alkali solution may also contain a substance resulting from the treatment of a lignocellulosic material with alkali as described in Specification 438,434. The alkali treatment may be in two stages, preferably first with dilute alkali at elevated temperatures and optionally under pressure, and then with cold, stronger alkali. The products are suitable for the preparation of cellulose esters and ethers and for the manufacture of paper. Specifications 263,938, 312,098, [both in Class 2 (ii)], and 438,435, also are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1477734A GB438433A (en) | 1934-05-16 | 1934-05-16 | Improvements in the manufacture of cellulose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1477734A GB438433A (en) | 1934-05-16 | 1934-05-16 | Improvements in the manufacture of cellulose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB438433A true GB438433A (en) | 1935-11-18 |
Family
ID=10047297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1477734A Expired GB438433A (en) | 1934-05-16 | 1934-05-16 | Improvements in the manufacture of cellulose |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB438433A (en) |
-
1934
- 1934-05-16 GB GB1477734A patent/GB438433A/en not_active Expired
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