Process for the purification of 4,4' dihydroxydiphenyl

Details Process for the purification of 4,4' dihydroxydiphenyl Process for the purification of 4,4' dihydroxydiphenyl

1980-03-06

1982-04-13

Lone, Werren B.

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

Organic compounds

Oxygen containing

568749, 568758, 568724, 568742, C07C 3782, C07C 3921

Patent

active

043249264

ABSTRACT:
A process for purifying 4,4'-dihydroxydiphenyl comprising contacting a solution of 4,4'-dihydroxydiphenyl alkali metal salt with activated carbon followed by removing the activated carbon from the solution and acidifying the solution with sufficient acid to convert essentially all of the 4,4'-dihydroxydiphenyl alkali metal salt to water insoluble 4,4'-dihydroxydiphenyl and 4,4'-dihydroxydiphenyl product containing less than 0.45 weight percent of 4-monohydroxydiphenyl impurity.

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patent: 4169211 (1979-09-01), Ligorati et al.
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