Manufacturing method for bisphenols and a manufacturing method f

Details Manufacturing method for bisphenols and a manufacturing method f Manufacturing method for bisphenols and a manufacturing method f

1998-12-10

1999-12-28

Mosley, Terressa

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528190, 528193, C08G 6300

Patent

active

060083158

ABSTRACT:
A phenol and a ketone are reacted to form bisphenol, and the liquid bisphenol obtained or a mixed solution of said solution and a phenol is filtered through a calcined metal filter to obtain bisphenol which makes it possible to efficiently obtain bisphenol which either does not contain fine particulate impurities or contains such impurities only in minute amounts, and a method for manufacturing polycarbonate using bisphenol obtained by this method. The filtration grade of the calcined metal filter should be 1.0 .mu.m or less. After filtering, the calcined metal filter can be backwashed or chemically washed and then reused. The bisphenol should preferably be bisphenol A.

REFERENCES:
patent: 4931146 (1990-06-01), Iimuro et al.
patent: 5180676 (1993-01-01), Ichikawa et al.

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