METHOD FOR THE PURIFICATION OF CRUDE 2,2-BIS-(3,5-DIMETHYL-4-HYDROXYPHENYL)-PROPANE

摘要

Crude 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)propane (=tetramethyl-bisphenol A=TMBPA) can be purified by recrystallization, if C1-C4-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 DEG to 150 DEG C.