乙酸甲酯催化精馏水解工艺研究

Catalytic Distillation Process of Methyl Acetate Hydrolysis

采用阳离子交换树脂为催化剂 ,研究了乙酸甲酯催化精馏水解工艺。反应区充填离子交换树脂催化剂捆束包 ,提馏段充填Mo Ti金属板波纹丝网填料。在小试、中试 (塔径为 2 0 0mm)和工业化 (塔径为1 0 0 0mm)实验中 ,系统地研究了水酯摩尔比、回流进料比和空速对酯分解率和分解液中酸水质量比的影响 ,获得不改变现有聚乙烯醇生产中乙酸甲酯分解回收工艺流程的最佳分解率为 50 %— 60 % ,由此导致比原工艺节能约 30

Cation exchange resins were used as catalysts in methyl acetate hydrolysis on catalytic distillation. Catalyst bundle of ion exchange resin was packed in a column as a reaction zone and Mo Ti metal plate gauze structured packing was packed in a column as the recovery zone. The influence of the factors, such as the feed mole ratio of water to methyl acetate, the volume ratio of tap reflux to feed methyl acetate and the feed space velocity of methyl acetate, on the conversion of methyl acetate and mass ratio of acetate acid to water in the hydrolysis mixture were researched systematically on the experiments in the laboratory, a pilot plant test in column of 200 mm diameter and industrial test in column of 1000 mm diameter on production field. The results of experiments show that higher conversion of methyl acetate (50%-60%) can be achieved even at a lower ratio of reflux to feed (less than 2 ) and a higher space velocity (higher than that of the conventional process).The advantages of the new process are reduction of the heat requirement of the total process. The decrease in heat requirement is estimated to be 30% of conventional process.