Process for the purification of reaction mixtures containing 4-hydroxybenzaldehyde

摘要

Sepn. of difficulty soluble byprods. from a reaction mixt. obtd. after oxidn. of p-cresol with O2 or an O2-contg. gas in methanol in the presence of alkali hydroxide and a metal catalyst comprises neutralisation of excess alkali in the mixt. to form a salt ppte. and sepg. this together with the difficulty soluble byprods..