Process for preparing 1-hydroxy, ethylidene-1,1-diphosphonic aci

Details Process for preparing 1-hydroxy, ethylidene-1,1-diphosphonic aci Process for preparing 1-hydroxy, ethylidene-1,1-diphosphonic aci

1975-07-31

1976-05-25

Evans, Joseph E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260541, 260544Y, 423488, C07F 938

Patent

active

039593606

ABSTRACT:
A process for preparing 1-hydroxy, ethylidene-1,1-diphosphonic acid, which comprises contacting a phosphorus trihalide such as phosphorus trichloride with glacial acetic acid in a reaction zone maintained at a temperature of from about 50.degree.C. to about 80.degree.C. while continuously removing by-product acetyl halide as formed from the said reaction zone to form a single-phase liquid reaction product, heating said reaction product to a temperature of from 90.degree.C. to 140.degree.C. and reacting therewith acetic anhydride to form a normally solid anhydrous reaction product, and hydrolyzing said product by steam treatment to recover the desired 1-hydroxy, ethylidene-1,1-diphosphonic acid and remove by-product acetic acid. The acetyl halide by-product is recovered by absorbing same in the aqueous by-product acetic acid recovered from the hydrolysis step and thereby recovering glacial acetic acid for storage and recycle to the process. The process is adapted for continuous operation.

REFERENCES:
patent: 3202579 (1965-08-01), Berth et al.
patent: 3270064 (1966-08-01), Inaba et al.
patent: 3366677 (1968-01-01), Quimby
patent: 3409510 (1968-11-01), Master et al.
patent: 3449409 (1969-06-01), Irani et al.

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