Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1989-12-27
1991-02-05
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568722, 568727, C07C 3784
Patent
active
049906860
ABSTRACT:
Crude 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)propane (=tetramethyl-bisphenol A=TMBPA) can be purified by recrystallization, if C.sub.1 -C.sub.4 -monoalcohols with a water content of 2 to 40% by weight relative to the total weight of alcohol and water are used in an amount of 70 to 250% by weight, relative to the amount of TMBPA and the recrystallization is carried out at a temperature of 65.degree. to 150.degree. C.
REFERENCES:
patent: 4242527 (1980-12-01), Mark et al.
patent: 4320234 (1982-03-01), Mark et al.
patent: 4414422 (1983-11-01), Ash et al.
Blank Heinz-Ulrich
Handschuh Volkmar
Rauchschwalbe Gunter
Bayer Aktiengesellschaft
Lone Werren B.
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