Conversion of organophosphonic acids into their salts using inte

Details Conversion of organophosphonic acids into their salts using inte Conversion of organophosphonic acids into their salts using inte

1987-08-12

1989-07-25

Berch, Mark L.

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

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

546 21, 548412, C07F 956, C07F 965, C07B 4102

Patent

active

048515256

ABSTRACT:
Process for the conversion of an organophosphonic acid of the formula ##STR1## in which n=3-5 and R=H or C.sub.1 -C.sub.3 alkyl, into an alkali metal or ammonium salt comprising reacting the moist filter cake which accumulates during the production of organophosphonic acids by known processes (water content 10 to 40% by weight) with anhydrous or concentrated aqueous alkali metal hydroxide or ammonia and exposing the paste formed, which has a water content of from 20 to 80% by weight, to intense shear forces in mixing, dispersing, or kneading units, water being removed from the paste under reduced pressure and with application of heat until the paste changes into a free-flowing powder.

REFERENCES:
patent: 3941772 (1976-03-01), Ploger et al.
patent: 3969295 (1976-07-01), Sunden
patent: 3988443 (1976-10-01), Ploger et al.
Chemical Engineer's Handbook, Robert H. Perry, Cecil H. Chilton, Fifth Edition, pp. 8-37-8-38, 8-55-8-56, 19-14-91-17, 19-21-19-23.
Chemical Engineer's Handbook, John H. Perry, Ph.D., Second Edition, pp. 1572-1574, 1941.

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