Process for the manufacture of aluminum monoethyl phosphite
US4272448A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1979 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | Jun 25, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/142
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Aluminum monoethyl-phosphite, useful for the protection of plants against fungal diseases, is manufactured in a continuous manner by first preparing a mixture of phosphite compounds, containing at least 70 mol % of diethyl phosphite, then saponifying and neutralizing such mixture with an inorganic base, at a temperature of 20.degree.-85.degree. C., at a pH of 4.0-8.5, and finally reacting the residual aqueous solution of alkaline metal monoethyl-phosphite, continuously withdrawn from the preceding operation, with an approximately stoichiometric amount of a water-soluble aluminum salt at 70.degree.-95.degree. C. and a pH of 3.0-4.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.