GB636347A - Improvements in and relating to the manufacture of aromatic amino carboxylic acids - Google Patents
Improvements in and relating to the manufacture of aromatic amino carboxylic acidsInfo
- Publication number
- GB636347A GB636347A GB1520547A GB1520547A GB636347A GB 636347 A GB636347 A GB 636347A GB 1520547 A GB1520547 A GB 1520547A GB 1520547 A GB1520547 A GB 1520547A GB 636347 A GB636347 A GB 636347A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- alkali metal
- bicarbonate
- amino
- relating
- 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
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Alkali metal salts of 2-hydroxy-4-amino-benzoic acid are prepared by heating m-aminophenol with carbon dioxide and alkali metal hydroxide, carbonate or bicarbonate at 105-135 DEG C. in a polyhydric alcohol. The free acid may be isolated by adding hydrochloric acid to the reaction product until just acid to litmus or by adding the reaction product to an excess of hydrochloric acid to precipitate the hydrochloride of the amino acid which is separated, dried and decomposed by the addition of an alkali metal bicarbonate and just sufficient water to dissolve the alkali metal chloride formed. In an example, m-amino-phenol is heated with potassium bicarbonate in glycerol at 130 DEG C. while a stream of carbon dioxide is passed in, the product is converted to the hydrochloride from which the free acid is liberated by the addition of the equivalent quantity of sodium bicarbonate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1520547A GB636347A (en) | 1947-06-10 | 1947-06-10 | Improvements in and relating to the manufacture of aromatic amino carboxylic acids |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1520547A GB636347A (en) | 1947-06-10 | 1947-06-10 | Improvements in and relating to the manufacture of aromatic amino carboxylic acids |
Publications (1)
Publication Number | Publication Date |
---|---|
GB636347A true GB636347A (en) | 1950-04-26 |
Family
ID=10054882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1520547A Expired GB636347A (en) | 1947-06-10 | 1947-06-10 | Improvements in and relating to the manufacture of aromatic amino carboxylic acids |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB636347A (en) |
-
1947
- 1947-06-10 GB GB1520547A patent/GB636347A/en not_active Expired
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