Process for producing 1,...

Details Process for producing 1,... Process for producing 1,...

2006-01-31

2006-01-31

Tsang, Cecilia J. (Department: 1625)

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

Organic compounds

Oxygen containing

Reexamination Certificate

active

06992227

ABSTRACT:
A process for production of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane which comprises reacting phenol with 3,3,5-trimethylcyclohexanone in the presence of an acid catalyst, separating the resulting phenol adduct crystals of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane from the resulting reaction mixture, and removing the phenol from the phenol adduct crystals, wherein the phenol adduct crystals are dissolved in a crystallization solvent comprising an aromatic hydrocarbon solvent and water, crystallizing the crystals of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane out of the crystallization solvent, and collecting the crystals by filtration at a temperature of 40–60° C.

REFERENCES:
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patent: 2000-159710 (2000-06-01), None

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