GB623217A - Improvements in or relating to 2-methyl-4-chloro-phenoxyacetic acid - Google Patents
Improvements in or relating to 2-methyl-4-chloro-phenoxyacetic acidInfo
- Publication number
- GB623217A GB623217A GB3680846A GB3680846A GB623217A GB 623217 A GB623217 A GB 623217A GB 3680846 A GB3680846 A GB 3680846A GB 3680846 A GB3680846 A GB 3680846A GB 623217 A GB623217 A GB 623217A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- chloro
- per cent
- weight
- methyl
- 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
- C07C51/42—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
Solid 2-methyl-4-chloro-phenoxyacetic acid containing not more than 10 per cent by weight of water is obtained by acidifying with vigorous agitation the product from the aqueous alkaline condensation of chloro-orthocresol with monochloracetic acid at such a temperature that the precipitated acid is molten, the mixture so obtained being continuously fed to a second vessel maintained at a temperature at which the acid phase remains molten and where it is allowed to separate by gravity, being then run off and allowed to cool. Before cooling, water may be removed from the acid by heating above 100 DEG C. Preferably the alkaline condensation product contains 5-20 per cent by weight of, e.g., the sodium salt of the oxyacetic acid. The step of acidification is controlled at just acid to Congo Red, i.e. about pH 3.0 and aqueous mineral acid, such as hydrochloric and 30-50 per cent by weight sulphuric acid used. Specifications 573,510 and 573,929, [Group I], are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3680846A GB623217A (en) | 1946-12-13 | 1946-12-13 | Improvements in or relating to 2-methyl-4-chloro-phenoxyacetic acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3680846A GB623217A (en) | 1946-12-13 | 1946-12-13 | Improvements in or relating to 2-methyl-4-chloro-phenoxyacetic acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB623217A true GB623217A (en) | 1949-05-13 |
Family
ID=10391341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3680846A Expired GB623217A (en) | 1946-12-13 | 1946-12-13 | Improvements in or relating to 2-methyl-4-chloro-phenoxyacetic acid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB623217A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2651568A (en) * | 1950-12-07 | 1953-09-08 | Solvay | Process for preventing the precipitation of insoluble salts of phenoxyacetic acids |
-
1946
- 1946-12-13 GB GB3680846A patent/GB623217A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2651568A (en) * | 1950-12-07 | 1953-09-08 | Solvay | Process for preventing the precipitation of insoluble salts of phenoxyacetic acids |
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