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

摘要

the invention concerns the recycling of methanol in the production process of dimethyl oxalate with synthesis gas, comprising the following steps: i) stream of raw methanol containing nitrate (iii) methyl, methyl formate and dimethyl carbonate is introduced into the first column that separates and at the top is a nitrate (iii) methyl, and its bottom is a stream of crude methanolcontaining methyl formate and dimethyl carbonate; ii) a stream containing raw methanol, methyl formate and dimethyl carbonate, is inserted in the second column that separates and on its top is methyl formate, and its bottom is a stream of crude methanol, contains for dimethyl carbonate; and (iii) a stream containing raw methanol, dimethyl carbonate,moving unit that separates the dimethyl carbonate and methanol and dimethyl carbonate is a stream and a stream of methanol for recycling, after separation. in accordance with the method according to this invention can reduce the quantity of methyl formate accumulated in the system, and therefore can reduce the corrosion of pipelines and equipment.in addition, you can improve the purity of methanol, and therefore can reduce the volume of currency, thus reducing power consumption.