Process for manufacturing 1-hydroxyalkylidene-1,1-diphosphonic a

Details Process for manufacturing 1-hydroxyalkylidene-1,1-diphosphonic a Process for manufacturing 1-hydroxyalkylidene-1,1-diphosphonic a

1996-10-02

2000-11-07

Shippen, Michael L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus acids or salts thereof

C07F 922

Patent

active

061439231

ABSTRACT:
A process for manufacturing 1-hydroxyalkylidene-1,1-diphosphonic Acid (HADP) by introducing phosphorus trihalide (PX.sub.3) into a reactor containing aqueous acid of the formula RCOOH at a temperature of 60-200.degree. C. and a pressure of 15-150 psig. Water is added to hydrolyze the intermediate formed to obtain HADP.

REFERENCES:
patent: 3366677 (1968-01-01), Quimby
patent: 3959360 (1976-05-01), Vazopolos
patent: 4332736 (1982-06-01), Starner

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