Dehydration of acetic acid in adipic acid mfr. without cobalt salt pptn.

摘要

Dehydration of process acetic acid from liq. phase oxidn. of cyclohexane with air in the presence of Co salts as catalyst is carried out in a dehydration colum, without pptn. of Co salts, after sepn. of the adipic acid by filtration and of the cyclohexane phase by phase sepn.. Dehydration is carried out by azeotropic distn. of the acetic acid phase to be recycled, with addn. of cyclohexane, until the residual water content is less than 0.3 up to 0.7 wt.%.