GB824640A - A process for the production of anhydrous cyanoacetic acid - Google Patents
A process for the production of anhydrous cyanoacetic acidInfo
- Publication number
- GB824640A GB824640A GB23528/58A GB2352858A GB824640A GB 824640 A GB824640 A GB 824640A GB 23528/58 A GB23528/58 A GB 23528/58A GB 2352858 A GB2352858 A GB 2352858A GB 824640 A GB824640 A GB 824640A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- cyanoacetic acid
- acid
- anhydrous
- cyanoacetic
- 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
- C07C255/00—Carboxylic acid nitriles
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Anhydrous cyanoacetic acid is obtained from an aqueous solution of the acid which also contains inorganic salts by concentrating the solution in vacuo until the solution is substantially anhydrous, extracting the cyanoacetic acid from the evaporation residue by means of an aliphatic ester which boils at a temperature below 70 DEG C. in vacuo, separating the cyanoacetic acid solution which is formed, and removing the extraction agent from the solution. Suitable esters are, for example, methyl acetate, ethyl acetate and butyl acetate. The starting solution of cyanoacetic acid may be prepared by neutralizing chloroacetic acid with soda, adding the resulting solution to aqueous sodium cyanide, and adding sulphuric acid to the resulting solution to obtain cyanoacetic acid which contains sodium chloride and sodium sulphate as impurities. The cyanoacetic acid is concentrated in a vacuum which does not exceed 60 mm. Hg. at a temperature below 85 DEG C.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH824640X | 1957-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB824640A true GB824640A (en) | 1959-12-02 |
Family
ID=4539802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23528/58A Expired GB824640A (en) | 1957-10-17 | 1958-07-22 | A process for the production of anhydrous cyanoacetic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB824640A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3375268A (en) * | 1964-08-27 | 1968-03-26 | Kay Fries Chemicals Inc | Process for producing cyanoacetic acid |
| CN102336685A (en) * | 2011-09-17 | 2012-02-01 | 潍坊柏立化学有限公司 | Method for preparing cyanoacetic acid through continuous dehydration |
-
1958
- 1958-07-22 GB GB23528/58A patent/GB824640A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3375268A (en) * | 1964-08-27 | 1968-03-26 | Kay Fries Chemicals Inc | Process for producing cyanoacetic acid |
| CN102336685A (en) * | 2011-09-17 | 2012-02-01 | 潍坊柏立化学有限公司 | Method for preparing cyanoacetic acid through continuous dehydration |
| CN102336685B (en) * | 2011-09-17 | 2014-05-28 | 潍坊柏立化学有限公司 | Method for preparing cyanoacetic acid through continuous dehydration |
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