GB521884A - Improvements in or relating to the manufacture of cellulose esters - Google Patents
Improvements in or relating to the manufacture of cellulose estersInfo
- Publication number
- GB521884A GB521884A GB34943/38A GB3494338A GB521884A GB 521884 A GB521884 A GB 521884A GB 34943/38 A GB34943/38 A GB 34943/38A GB 3494338 A GB3494338 A GB 3494338A GB 521884 A GB521884 A GB 521884A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- esterification
- perchloric acid
- complete
- hydrolysis
- 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
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/02—Catalysts used for the esterification
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
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
521,884. Cellulose esters. I.G. FARBENINDUSTRIE AKT.-GES. Nov. 30, 1938, No. 34943. Convention date, Dec. 1, 1937. [Class 2 (ii)] Cellulose esters of high clarity are prepared by incorporating perchloric acid with cellulose ester solutions, prepared in the presence of sulphuric acid, shortly before esterification is complete ; alternatively, after esterification is complete, hydrolysis of such esters is carried out in the presence of perchloric acid. The two methods may be combined, for example, by adding a portion of the perchloric acid to the esterification solution shortly before esterification is complete, and a further portion before hydrolysis begins. In an example, cellulose is acetylated with a reaction mixture containing acetic anhydride, methylene chloride and sulphuric acid. After adding water to destroy excess of acetic anhydride, hydrolysis is effected by adding aqueous perchloric acid. In another example, cotton linters, pretreated with acetic acid, are acetylated in a mixture comprising acetic anhydride, methylene chloride and sulphuric acid, and shortly before esterification is complete, perchloric acid is added. The solution may be worked up, if desired after hydrolysis. In a further example, cotton linters, pretreated with acetic acid, are esterified with a mixture consisting of ethylene chloride, acetic anhydride, butyric acid and sulphuric acid. During the reaction perchloric acid is added and the esterification completed. The product may be worked up directly or hydrolyzed after addition of more perchloric acid. Specifications 337,366, [Class 2 (ii)], and 403,554 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE521884X | 1937-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB521884A true GB521884A (en) | 1940-06-03 |
Family
ID=6551507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB34943/38A Expired GB521884A (en) | 1937-12-01 | 1938-11-30 | Improvements in or relating to the manufacture of cellulose esters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB521884A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010104371A1 (en) * | 2009-03-12 | 2010-09-16 | Universiti Malaya | A conversion of cellulosic materials into glucose for use in bioethanol production |
-
1938
- 1938-11-30 GB GB34943/38A patent/GB521884A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010104371A1 (en) * | 2009-03-12 | 2010-09-16 | Universiti Malaya | A conversion of cellulosic materials into glucose for use in bioethanol production |
CN102348812A (en) * | 2009-03-12 | 2012-02-08 | 马来西亚大学 | Conversion of cellulosic materials into glucose for use in bioethanol production |
CN102348812B (en) * | 2009-03-12 | 2013-02-27 | 马来西亚大学 | Conversion of cellulosic materials into glucose for use in bioethanol production |
US8895275B2 (en) | 2009-03-12 | 2014-11-25 | Universiti Malaya | Conversion of cellulosic materials into glucose for use in bioethanol production |
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