Water removal of trimethyl phosphate from phosphorus containing pesticides
US4512932A · kind A · utility
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4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1983 |
| Grant date | Apr 23, 1985 |
| Priority date | — |
| Expiry date | Mar 25, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/025
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A single of multi-step water extraction process is described for removing trimethyl phosphate (TMPO) from phosphorus containing pesticides having limited water solubility including 2,2-dichlorovinyl dimethyl phosphate (DDVP), dimethyl CIS-1-methyl-2(1-phenylethoxycarbonyl)vinyl phosphate, 1,2-dibromo-2,2-dichloroethyl dimethyl phosphate, and trans-2-chloro-1-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate to a concentration of less than 1000 ppm. Methanol, dimethyl methylphosphonate, and dimethyl hydrogen phosphite are also removed from DDVP.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.