GB650343A - Improvements in or relating to the manufacture of methacrylic acid - Google Patents
Improvements in or relating to the manufacture of methacrylic acidInfo
- Publication number
- GB650343A GB650343A GB1971748A GB1971748A GB650343A GB 650343 A GB650343 A GB 650343A GB 1971748 A GB1971748 A GB 1971748A GB 1971748 A GB1971748 A GB 1971748A GB 650343 A GB650343 A GB 650343A
- Authority
- GB
- United Kingdom
- Prior art keywords
- methacrylic acid
- sulphuric acid
- mixture
- perchlorethylene
- trichlorethylene
- 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
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/06—Preparation of carboxylic acids or their salts, halides or anhydrides from carboxylic acid amides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Methacrylic acid is manufactured from the crude methacrylamide-sulphuric acid mixture, obtained by reacting acetone cyanhydrin with sulphuric acid, by adding the methacrylamide-sulphuric acid product to water, distilling the resulting mixture, adding to the distillate an organic solvent for methacrylic acid which is immiscible with water and separating the organic solvent layer containing dissolved methacrylic acid from the aqueous layer. Suitable solvents are aromatic hydrocarbons such as benzene and toluene, aliphatic liquid hydrocarbons such as petroleum ether and chlorinated hydrocarbons such as ethylene dichloride, perchlorethylene, trichlorethylene and carbon tetrachloride. In carrying out the reaction an anti-polymerization agent, for example, a mixture of copper sulphate and hydroquinone may be used. In the examples, the process was carried out using (a) trichlorethylene, (b) perchlorethylene, (c) carbon tetrachloride, (d) benzene, (e) petroleum ether, (f) ethylene dichloride, and (g) toluene as solvents. Specification 456,533 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1971748A GB650343A (en) | 1948-07-23 | 1948-07-23 | Improvements in or relating to the manufacture of methacrylic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1971748A GB650343A (en) | 1948-07-23 | 1948-07-23 | Improvements in or relating to the manufacture of methacrylic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB650343A true GB650343A (en) | 1951-02-21 |
Family
ID=10134045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1971748A Expired GB650343A (en) | 1948-07-23 | 1948-07-23 | Improvements in or relating to the manufacture of methacrylic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB650343A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1166183B (en) * | 1961-01-30 | 1964-03-26 | Degussa | Process for the production of methacrylic acid and ammonium bisulfate |
| US3414485A (en) * | 1967-05-17 | 1968-12-03 | Escambia Chem Corp | Process for drying methacrylic acid by extraction and azeotropic distillation |
-
1948
- 1948-07-23 GB GB1971748A patent/GB650343A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1166183B (en) * | 1961-01-30 | 1964-03-26 | Degussa | Process for the production of methacrylic acid and ammonium bisulfate |
| US3414485A (en) * | 1967-05-17 | 1968-12-03 | Escambia Chem Corp | Process for drying methacrylic acid by extraction and azeotropic distillation |
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