质子酸离子液体催化合成乙酸乙酯的研究

Synthesis of ethyl acetate catalyzed by Brnsted acidic ionic liquids

以质子酸离子液体为催化剂研究了乙醇和乙酸酯化反应生成乙酸乙酯。结果表明,离子液体的用量为催化剂量,在60℃4、h、n(乙醇)∶n(乙酸)=1∶1的条件下,乙醇转化率92.3%,乙酸乙酯的选择性为100%。反应结束后,产物和离子液体分层,通过简单的倾倒即可分离产物。分离后的离子液体经真空干燥脱水后重复使用5次,催化活性不变。

Synthesis of ethyl acetate catalyzed by Bronsted acidic ionic liquids （IL） was studied. Ethanol conversion of 92.3 % and selectivity to ethyl acetate of 100 % was attained under the following condition： n（ethanol）： n （acetic acid）=1, quantity of ionic liquid equivalent to that of the catalyst 60 ℃. Ethyl acetate could be conveniently decanted out from the ionic liquid, because those ionic liquids were entirely miscible with water while the ester was immiscible with those ionic liquids. The ionic liquid can be repeatedly used for over 5 times after separation with the product, vacuum drying and dehydration, without remarkable loss in the conversion and selectivity.