Process for purifying phosphoric esters

Details Process for purifying phosphoric esters Process for purifying phosphoric esters

1995-06-19

1997-04-01

Richter, Johann

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

Organic compounds

Phosphorus esters

558147, C07F 902

Patent

active

056167687

ABSTRACT:
A process for purifying a phosphoric ester, which comprises treating a crude phosphoric ester with an epoxy compound, heating the resultant in the presence of water, washing the resultant with water, and removing the residual water. The obtained phosphoric esters have low acid value and are excellent in physical properties such as heat resistance, resistance to hydrolysis and storage stability, and are useful as plasticizers and/or flame-retardants.

REFERENCES:
patent: 3959414 (1976-05-01), Shim et al.
Gustav Jacobsen, Ber. 8, 1519 (1875).
M. Rapp, Ann. 224, 156 (1875).
English Language Abstract of Japanese Application No. 1-52379 of Feb. 28, 1989.
English Language Abstract of Japanese Application No. 63-227632 of Sep. 21, 1988.
Database WPI, Section Ch, Week 8650, Derwent Publications Ltd., London, abstract of JP 61246147, 1986.
Chemical Abstracts, vol. 083, No. 19, Nov. 10, 1975, Columbus, Ohio, US; Abstract No. 163759, Dul M et al.

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