Process for preparing bis(3-t-butyl-4-hydroxyphenyl-2,4-di-t-but

Details Process for preparing bis(3-t-butyl-4-hydroxyphenyl-2,4-di-t-but Process for preparing bis(3-t-butyl-4-hydroxyphenyl-2,4-di-t-but

1999-03-09

2000-09-26

Ambrose, Michael G.

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

Organic compounds

Phosphorus esters

558162, C07F 912

Patent

active

061244929

ABSTRACT:
The invention relates to a process for preparing bis(3-t-butyl-4-hydroxyphenyl-2,4-di-t-butylphenyl)resorcinol diphosphate, which has characteristics of high conversion and high selectivity, and which comprises of charging sequentially phenolic compounds, phosphoryl chloride, catalyst and organic base, heating the reaction mixture for carry out a three-stage esterification reaction and improving the purity of the product through molecular designing; dissolving the product in an organic solvent and removing residual hydrochloride salt with a small amount of ammonia gas, thereby achieving the object of purification without generation of waste water and waste product.

REFERENCES:
patent: 2520090 (1950-08-01), Barrett
patent: 5756798 (1998-05-01), Stults

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