GB396309A - Improvements relating to the manufacture of cellulose esters - Google Patents
Improvements relating to the manufacture of cellulose estersInfo
- Publication number
- GB396309A GB396309A GB3738/33A GB373833A GB396309A GB 396309 A GB396309 A GB 396309A GB 3738/33 A GB3738/33 A GB 3738/33A GB 373833 A GB373833 A GB 373833A GB 396309 A GB396309 A GB 396309A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- pretreated
- acetic anhydride
- benzene
- mixture
- 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
Abstract
Cellulose is esterified in the presence of a catalyst comprising an aliphatic sulphonic acid which contains at least one further acidic group or atom derived from a inorganic acid, e.g. a nitro group, halogen atom, or another sulphonic acid group. These catalysts do not enter into union with the cellulose and are completely removed by washing, giving stable primary or secondary esters. The following examples are given:--(1) Cotton linters are pretreated in acetic acid and acetylated in a mixture of acetic anhydride, methylene chloride, and methane disulphonic acid. (2) Cotton is pretreated as in (1) and esterified with acetic anhydride in the presence of benzene and methane disulphonic acid. (3) Cotton linters are pretreated and reacted with a mixture comprising acetic anhydride, isovalerianic anhydride, benzene, ligroin, and methane disulphonic acid, the mixture having been saturated with sulphur dioxide. (4) Pretreated cotton linters are acetylated with a mixture consisting of acetic anhydride, benzene, methane disulphonic acid, and sodium perchlorate. (5) Wood pulp pretreated in acetic acid is caused to react with a mixture consisting of acetic anhydride, sulphur dioxide, benzene, and trichlormethane sulphonic acid. (6) Pretreated cotton is acetylated with a mixture of acetic anhydride, benzene, sulphur dioxide, and chlormethane disulphonic acid. (7) Cotton is pretreated and acetylated in a mixture containing acetic anhydride, benzene, sulphur dioxide, and nitromethane disulphonic acid. (8) Bleached cotton linters are pretreated and acetylated with acetic anhydride in the presence of glacial acetic acid, monochloracetic acid, and nitromethane disulphonic acid. (9) Pretreated cotton is esterified in a mixture comprising acetic anhydride, benzene, sulphur dioxide, and propane trisulphonic acid. (10) Cotton is pretreated and added to a mixture of acetic anhydride, sulphur dioxide, benzene, and bromomethane disulphonic acid. Methane trisulphonic acid is also specified as a suitable catalyst.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE396309X | 1932-02-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB396309A true GB396309A (en) | 1933-08-03 |
Family
ID=6397012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3738/33A Expired GB396309A (en) | 1932-02-08 | 1933-02-07 | Improvements relating to the manufacture of cellulose esters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB396309A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0153659A2 (en) * | 1984-03-01 | 1985-09-04 | MERCK PATENT GmbH | Process for preparing microcrystalline triacetyl cellulose |
-
1933
- 1933-02-07 GB GB3738/33A patent/GB396309A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0153659A2 (en) * | 1984-03-01 | 1985-09-04 | MERCK PATENT GmbH | Process for preparing microcrystalline triacetyl cellulose |
| EP0153659A3 (en) * | 1984-03-01 | 1986-11-05 | Merck Patent Gesellschaft Mit Beschrankter Haftung | Process for preparing microcrystalline triacetyl cellulose |
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