Production of O,O-dialkyl-phosphorochloridothionates
US4075292A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1976 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | Jun 1, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An O,O-dialkyl-dithiophosphoric acid ester is reacted in two steps with approximately an equimolar amount of chlorine, the first step at about 0.degree. to 80.degree. C with all the reactants supplied, and the second step at about 0.degree. to 100.degree. C with precipitation of sulfur from the disulfur dichloride which is produced as a by-product in the first step and which serves as the chlorinating agent in the second step. Advantageously the first step is carried out continuously in two stages about one-third to two-thirds of the chlorine being supplied continuously to each stage. The first stage is at about 30.degree. to 60.degree. C and the second stage at about 10.degree. to 25.degree. C. The second step is thereafter performed batchwise and the desired product is distilled off from the residual sulfur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.