Process for the manufacture of aluminum monoethyl phosphite

Details Process for the manufacture of aluminum monoethyl phosphite Process for the manufacture of aluminum monoethyl phosphite

1979-06-25

1981-06-09

Sneed, Helen M. S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07F 506

Patent

active

042724481

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a pH of 4.0-8.5, and finally reacting the residual aqueous solution of alkaline metal monoethyl-phosphite, continuously withdrawn from the preceding operation, with an approximately stoichiometric amount of a water-soluble aluminum salt at 70.degree.-95.degree.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.

REFERENCES:
patent: 4139616 (1979-02-01), Ducret et al.
patent: 4143059 (1979-03-01), Abblard et al.

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