GB370011A - Improvements in or relating to the production of cellulose - Google Patents
Improvements in or relating to the production of celluloseInfo
- Publication number
- GB370011A GB370011A GB94/31A GB9431A GB370011A GB 370011 A GB370011 A GB 370011A GB 94/31 A GB94/31 A GB 94/31A GB 9431 A GB9431 A GB 9431A GB 370011 A GB370011 A GB 370011A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cellulose
- alkali
- per cent
- pulp
- sodium sulphite
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/05—Alpha cellulose
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
Cellulose solutions and cellulose esters and ethers having little or no colour are prepared from pulp which has been given an additional simultaneous treatment with an alkali and an alkali-stable reducing agent, for example, sodium sulphite or other sulphites, hydrosulphites, sulpho-hydrates, resorcine, or pyrogallol. In an example, unbleached pulp is boiled in a dilute lye containing 0,8 per cent each of sodium hydroxide and sodium sulphite, either with or without increased pressure, washed and bleached. The product has an alpha-cellulose content of about 97 per cent. Specification 10604/09, [Class 2 (ii), Cellulose &c.], is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE370011X | 1930-02-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB370011A true GB370011A (en) | 1932-04-01 |
Family
ID=6318433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB94/31A Expired GB370011A (en) | 1930-02-01 | 1931-01-01 | Improvements in or relating to the production of cellulose |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1991786A (en) |
| FR (1) | FR709817A (en) |
| GB (1) | GB370011A (en) |
-
1931
- 1931-01-01 GB GB94/31A patent/GB370011A/en not_active Expired
- 1931-01-13 FR FR709817D patent/FR709817A/en not_active Expired
- 1931-01-29 US US512216A patent/US1991786A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR709817A (en) | 1931-08-13 |
| US1991786A (en) | 1935-02-19 |
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