一种甲醇氧化羰基化制备碳酸二甲酯的工艺是采用催化精馏塔为主要反应装置,催化精馏塔的上部为精馏段,中部为反应段、下部为提馏段,提馏段塔底设再沸器,精馏段塔顶设冷凝回流器,液相甲醇从催化精馏塔的反应段顶部进料,加压的CO和氮气从提馏段底部进料,O_2在反应段分成1-5份气体分段进料,反应段中下降的甲醇与上升的CO/O_2逆流接触,在反应段催化剂填料床层中不断反应生 A process for the oxidative carbonylation of methanol to produce dimethyl carbonate uses a catalytic distillation column as the main reaction device. The upper part of the catalytic distillation column is a rectifying section, the middle is a reaction section, the lower part is a stripping section, a stripping section column A reboiler is arranged at the bottom of the rectifying section, a condensing reflux condenser is arranged at the top of the rectifying section, liquid phase methanol is fed from the top of the reaction section of the catalytic rectifying column, pressurized CO and nitrogen are fed from the bottom of the stripping section, 1 to 5 parts of gas are fed in sections, the descending methanol in the reaction section is in countercurrent contact with the rising CO / O 2, and the reaction continuously takes place in the catalyst bed