Method for recycling methanol in the dimethyl oxalate production process from synthesized gas

摘要

The invention relates to a method for recovering methanol in a coal-based synthetic gas-to-glycol process. The method comprises the following steps: a crude methanol flow containing methyl nitrite, methyl formate and dimethyl carbonate enters a nitrite recovery tower, methyl nitrite is recovered from the top of the recovery tower, methyl nitrite removed crude methanol enters a light component removal tower, methyl formate is removed from the top of the light component removal tower, methyl formate removed crude methanol contains a small amount of dimethyl carbonate, methanol and dimethyl carbonate are separated to obtain methanol for cycle use, and dimethyl carbonate is extracted as a product to be used in industrial production of glycol.