China Petroleum & Chemical Corporation
Method for separating dimethyl carbonate from methanol

Abstract:

A method for separating dimethyl carbonate from methanol includes subjecting a raw material containing dimethyl carbonate and methanol to extractive distillation. The extractant contains an ionic liquid and a compound having a general formula of CH.sub.3O(CH.sub.2CH.sub.2O).sub.nCH.sub.3, n being an integer of 2-8. The ionic liquid is an imidazole ionic liquid, a pyridine ionic liquid, or a mixture thereof.