Method for producing high purity...

Details Method for producing high purity... Method for producing high purity...

2005-04-05

2005-04-05

Shippen, Michael L. (Department: 1621)

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

Organic compounds

Oxygen containing

Reexamination Certificate

active

06875896

ABSTRACT:
A method for producing a high purity 1,1-bis(4-hydroxyphenyl)cyclohexane represented by the general formula (II),wherein R is a hydrogen atom or alkyl group, comprising the steps of: reacting cyclohexanone and a phenol represented by the general formula (I) in the presence of an acid catalyst;wherein R is the same as defined above,neutralizing the resultant reaction mixture with an alkali; primarily crystallizing and filtering a 1,1-bis(4-hydroxyphenyl)cyclohexane produced to obtain a primary crystallization filtrate; dissolving 100 parts by weight of the primary crystallization filtrate in a mixed solvent, which comprises 5 to 10 parts by weight of water and 100 to 200 parts by weight of a lower aliphatic ketone solvent, or 200 to 400 parts by weight of a lower aliphatic alcohol solvent; filtering the resulting solution through a zeta potential filter; and secondarily crystallizing and filtering the 1,1-bis(4-hydroxyphenyl)cyclohexane from the resulting filtrate in the presence of water.

REFERENCES:
patent: 3673262 (1972-06-01), Prahl et al.
patent: 4113974 (1978-09-01), Mark et al.
patent: 4535190 (1985-08-01), Arai et al.
patent: 4982014 (1991-01-01), Freitag et al.

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