催化精馏合成乙酸乙酯

以乙酸、乙醇为原料,阳离子交换树脂为催化剂,在自制精馏塔内催化精馏酯化合成乙酸乙酯.以捆扎包作为催化剂装填方式,并考察了催化剂布包材料、乙醇进料位置、空速、回流比、进料酸醇物质的量之比对乙醇转化率和塔顶产品中乙酸乙酯含量的影响.结果表明,合适的条件为催化剂布包采用尼龙布材料,乙醇进料位置在催化段底部,空速为0.213 h-1,进料酸醇物质的量之比3:1,回流比1.0.该工艺条件下,乙醇转化率为97.16%,塔顶乙酸乙酯的质量分数为95.44%.

Synthesis of Ethyl Acetate via Catalytic Distillation

Ethyl acetate was synthesized from acetic acid and ethanol using cation exchange resin as catalyst in a catalytic reactive distillation column, and catalyst-bundles of ion exchange resin catalyst packed in the column were used as reaction zones. The appropriate process conditions were obtained through investigating the influence of feed location of ethanol, space velocity, reflux ratio, and the molar ratio of acetic acid to ethanol on the performance of the catalytic distillation. The results showed that the suitable material of packing was nylon, the feed location of ethanol was at the bottom of the reaction region, and the appropriate reaction conditions were 0.213 h-1of space velocity, 3∶1 of molar ratio of acetic acid to ethanol, 1.0 of reflux ratio. Under the appropriate conditions,conversion of ethanol and concentration of ethyl acetate reached 97.16 % and 95.44%, respectively.