GB399508A - Improvements in cellulosic materials - Google Patents
Improvements in cellulosic materialsInfo
- Publication number
- GB399508A GB399508A GB980832A GB980832A GB399508A GB 399508 A GB399508 A GB 399508A GB 980832 A GB980832 A GB 980832A GB 980832 A GB980832 A GB 980832A GB 399508 A GB399508 A GB 399508A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sulphur dioxide
- cellulose
- acetic acid
- mixture
- per cent
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
Cellulosic materials are subjected to treatment with sulphur dioxide in proportions of at least 40 per cent of the weight of the cellulosic materials at ordinary temperature for a substantial period of time, i.e. of the order of an hour or more, or at increased temperatures. The starting material may be cotton or wood pulps, particularly those which have undergone a preliminary treatment with alkali. The sulphur dioxide may be employed in the gaseous or liquid form, or may be dissolved in a liquid medium, for example, a lower fatty acid. There may be present also inert diluents such as toluene and benzene, or constituents of a subsequent esterification mixture, for example, p acetic anhydride, or sulphuric acid or other catalyst. The sulphur dioxide may or may not be removed prior to esterification or etherification of the cellulose, and in the latter case, chlorine may be introduced into the mixture to form sulphuryl chloride, which acts as the catalyst in a subsequent esterification. The following examples are given:--(1) Wood pulp treated by the process of Specification 249,173, [Class 2 (ii), Cellulose &c.], is heated for 1 to 2 hours at 50 DEG -60 DEG C. with glacial acetic acid and sulphur dioxide (50 per cent of the weight of the cellulose); After cooling, acetic acid, acetic anhydride and chlorine are introduced to effect acetylation. (2) Moistened cotton linters are allowed to stand for 2-3 hours at ordinary temperatures with 60 per cent of liquid sulphur dioxide, and then introduced into a mixture of acetic acid, acetic anhydride, and sulphuric acid. (3) Cotton linters are pretreated with sulphur dioxide (100 per cent of the weight of the cellulose) and acetic acid at 30 DEG C. After 2-3 hours the sulphur dioxide is removed, and the pretreated cellulose acetylated in a mixture comprising acetic acid, benzol, acetic anhydride, and sulphuric acid. Specifications 20977/11, 20852/12, 6463/15, 14101/15, 100,009, 101,555, 164,374, 164,375, 164,377, 207,562, 277,721, 300,140, 309,201, 312,095, 312,096, 312,098, 315,278, 326,515, [all in Class 2 (ii), Cellulose &c.], and 395,707 also are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB980832A GB399508A (en) | 1932-04-05 | 1932-04-05 | Improvements in cellulosic materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB980832A GB399508A (en) | 1932-04-05 | 1932-04-05 | Improvements in cellulosic materials |
Publications (1)
Publication Number | Publication Date |
---|---|
GB399508A true GB399508A (en) | 1933-10-05 |
Family
ID=9879168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB980832A Expired GB399508A (en) | 1932-04-05 | 1932-04-05 | Improvements in cellulosic materials |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB399508A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2646429A (en) * | 1951-06-08 | 1953-07-21 | Eastman Kodak Co | Manufacture of cellulose acetate with sulfoacetic pretreatment |
US2992934A (en) * | 1956-11-26 | 1961-07-18 | Murata Kwanji | Process of esterification of cellulose |
US3424702A (en) * | 1964-04-28 | 1969-01-28 | Kunio Hata | Process of dissolving cellulosic materials and/or synthetic polymers in liquid sulfur dioxide |
-
1932
- 1932-04-05 GB GB980832A patent/GB399508A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2646429A (en) * | 1951-06-08 | 1953-07-21 | Eastman Kodak Co | Manufacture of cellulose acetate with sulfoacetic pretreatment |
US2992934A (en) * | 1956-11-26 | 1961-07-18 | Murata Kwanji | Process of esterification of cellulose |
US3424702A (en) * | 1964-04-28 | 1969-01-28 | Kunio Hata | Process of dissolving cellulosic materials and/or synthetic polymers in liquid sulfur dioxide |
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