GB402462A - Improvements in the manufacture of aliphatic anhydrides - Google Patents
Improvements in the manufacture of aliphatic anhydridesInfo
- Publication number
- GB402462A GB402462A GB1578132A GB1578132A GB402462A GB 402462 A GB402462 A GB 402462A GB 1578132 A GB1578132 A GB 1578132A GB 1578132 A GB1578132 A GB 1578132A GB 402462 A GB402462 A GB 402462A
- Authority
- GB
- United Kingdom
- Prior art keywords
- methylene chloride
- water
- ethers
- benzene
- led
- 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
- C07C51/54—Preparation of carboxylic acid anhydrides
- C07C51/573—Separation; Purification; Stabilisation; Use of additives
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
Water is removed from aliphatic anhydrides as an azeotropic mixture with methylene chloride. The methylene chloride may be injected as liquid or vapour into the anhydride reaction vapours so as to carry off the water while the anhydride and remaining acid are condensed; or the reaction vapours may be led, preferably after limited cooling, below or upon the surface of a body of methylene chloride. The methylene chloride may be used alone or mixed with other liquids such as light paraffins, gasoline, kerosene, ethers, or mixtures of ethers with petroleum hydrocarbons for instance mixtures of ether with petroleum ether, benzene, or homologues of benzene. In an example, methylene chloride is sprayed into the vapour obtained by thermal decomposition of acetic acid, and the mixture is led into the lower part of a fractionating column, and methylene chloride is also added at the top of the column in quantity more than sufficient to remove all the water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1578132A GB402462A (en) | 1932-06-04 | 1932-06-04 | Improvements in the manufacture of aliphatic anhydrides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1578132A GB402462A (en) | 1932-06-04 | 1932-06-04 | Improvements in the manufacture of aliphatic anhydrides |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB402462A true GB402462A (en) | 1933-12-04 |
Family
ID=10065344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1578132A Expired GB402462A (en) | 1932-06-04 | 1932-06-04 | Improvements in the manufacture of aliphatic anhydrides |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB402462A (en) |
-
1932
- 1932-06-04 GB GB1578132A patent/GB402462A/en not_active Expired
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