Method of purifying acifluorfen
US5446197A · kind A · utility
4Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1993 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Jun 17, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C201/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method of purifying acifluorfen to achieve a purity of greater than about 85% by weight involves heating to dissolution a solution of an acifluorfen crude wet cake and at least one solvent from the group of 1,2-dichlorobenzene, monochlorobenzene, o-xylene and p-xylene, with the solution having from about 10 to about 30 weight percent of acifluorfen crude wet cake. The-solution is then cooled until crystals of purified acifluorfen form. The crystals are then filtered at a temperature within the range of from about 0.degree. to about 30.degree. C. The filtered crystals are then recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.