GB786917A - Para-aminosalicylic acids - Google Patents
Para-aminosalicylic acidsInfo
- Publication number
- GB786917A GB786917A GB23488/55A GB2348855A GB786917A GB 786917 A GB786917 A GB 786917A GB 23488/55 A GB23488/55 A GB 23488/55A GB 2348855 A GB2348855 A GB 2348855A GB 786917 A GB786917 A GB 786917A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- isopropanol
- water
- acid
- salt
- 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
- Carbon And Carbon Compounds (AREA)
Abstract
A pure, dense form of p-aminosalicylic acid is prepared by forming a solution of an alkali metal salt of the acid in a water-isopropanol medium and acidifying the solution to precipitate p-aminosalicylic acid. The salt can be dissolved in aqueous isopropanol, or, alternatively, can be dissolved in water and isopropanol added to the solution so formed, either before or as the solution is acidified. A surface-active agent may be added to the water-isopropanol medium. Any acid capable of precipitating p-aminosalicylic acid from a solution of an alkali metal salt thereof may be used, hydrochloric, sulphuric and formic acids being specified. The process of the invention is illustrated in examples, the following additional features being described (a) sodium bisulphite or hydrosulphite present in the water-isopropanol medium and (b) preliminary treatment of the aqueous salt solution with activated carbon.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US786917XA | 1954-09-13 | 1954-09-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB786917A true GB786917A (en) | 1957-11-27 |
Family
ID=22145637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23488/55A Expired GB786917A (en) | 1954-09-13 | 1955-08-15 | Para-aminosalicylic acids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB786917A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111848432A (en) * | 2020-07-15 | 2020-10-30 | 广药白云山化学制药(珠海)有限公司 | Preparation method of p-aminosalicylic acid |
-
1955
- 1955-08-15 GB GB23488/55A patent/GB786917A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111848432A (en) * | 2020-07-15 | 2020-10-30 | 广药白云山化学制药(珠海)有限公司 | Preparation method of p-aminosalicylic acid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB937547A (en) | Catalyst recovery process | |
| GB786917A (en) | Para-aminosalicylic acids | |
| GB934292A (en) | Process for the preparation of heterocyclic compounds | |
| GB905699A (en) | Improvements relating to heat-sensitive compositions | |
| GB416892A (en) | Process for the manufacture of dihydroresorcinol | |
| GB939920A (en) | Process for the production of 1, 1, 1, -trifluoro-2-chloro-2-bromoethane | |
| GB613080A (en) | Improvements in the preparation of stable medicinal salts of acetylsalicylic acid | |
| GB698022A (en) | Process for the purification of phenoxy-aliphatic-mono-carboxylic acids | |
| GB915486A (en) | Recovery of demethylchlortetracycline | |
| GB765514A (en) | Process for the purification of diphenylol propane | |
| GB887012A (en) | Process for the preparation of 18ª--glycyrrhetinic acid | |
| GB973829A (en) | Improvements in or relating to silicate grouts | |
| GB729625A (en) | Improvements in or relating to the preparation of non-odorous 2-methyl-4-chlorophenoxyacetic acid and its application as a selective weed-killer | |
| GB771484A (en) | Preparation of -ß-aminomethyltropolone | |
| GB586133A (en) | Improvements in or relating to the recovery of crotonic acid | |
| GB763165A (en) | Production of active carbon carrying acid surface groups capable of cation exchange | |
| GB950900A (en) | Process for the preparation of thiophene-2,5-dicarboxylic acid | |
| GB982532A (en) | Improved process for preparing and for purifying octachlorodihydroxydiphenyl | |
| GB781212A (en) | Improvements in the preparation of new formaldehyde derivatives | |
| GB753222A (en) | Production of pentadecanedioic acid | |
| GB977692A (en) | Preparation of degraded carrageenin | |
| GB789666A (en) | Producing oximes by the reduction of nitro-cyclo paraffins | |
| GB573648A (en) | Manufacture of hydracrylic acid | |
| GB1090559A (en) | Process for the production of alkali salts of carboxylic acids | |
| GB1144969A (en) | Improvements in or relating to the preparation of cyclohexylsulfamic acid |