Selective manufacture of anhydrous modifications of methyl phosp

Details Selective manufacture of anhydrous modifications of methyl phosp Selective manufacture of anhydrous modifications of methyl phosp

1973-09-07

1978-12-12

Evans, Joseph E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2605024R, C07F 938

Patent

active

041295889

ABSTRACT:
Pyro-methyl phosphonic acid (methyl phosphonic acid monoanhydride) is obtained in a high degree of purity and a yield approaching 100% of theory by the pyrolysis of dimethyl hydrogen phosphite in liquid phase. The pyrolysis product is then converted to methyl phosphonic acid by boiling with water. If desired, the resulting aqueous acid solution may be directly converted to a salt, e.g., to monoammonium methyl phosphonate by the addition of one mole of ammonia per mole of methyl phosphonic acid, or water may be evaporated from the aqueous acid solution and crystalline methyl phosphonic acid may thus be recovered.

REFERENCES:
patent: 2304157 (1942-12-01), Englemann et al.
patent: 2951863 (1960-09-01), Dawson et al.
patent: 3400149 (1968-09-01), Quimby et al.
patent: 3600435 (1971-08-01), Randall et al.
Kosolapuff, "Organophosphorus Compounds", 1950, p. 148.

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