以低温甲醇洗装置尾气为原料,利用LNG冷能在低温、低压条件下精馏制备高纯二氧化碳。分析低温、低压下二氧化碳中杂质分离的可行性以及LNG冷能在二氧化碳提纯中的利用方式,实现了LNG冷能耦合高纯二氧化碳的制备。低温、低压精馏法制备高纯二氧化碳工艺电力消耗仅为传统中压精馏法的30.7%。

Taking the tail gas from the low-temperature methanol washing unit as feedstock,high-purity electronic grade carbon dioxide is prepared through distillation under low temperature and low pressure by utilizing LNG cold energy.The feasibility for separating impurities from carbon dioxide under low temperature and low pressure is analyzed,and the utilization mode of LNG cold energy in carbon dioxide purification are explored.The preparation of high-purity carbon dioxide coupled with LNG cold energy has been achieved,with a power consumption being only 30.7% that of the traditional medium pressure distillation process.