离子液体磷钨酸盐合成及在酯化反应中的应用

以酸性离子液体和磷钨酸反应制成离子液体磷钨杂多酸盐,并以它作为催化剂研究了乙醇和乙酸酯化生成乙酸乙酯的反应,考察了反应时间、反应温度、催化剂的物质的量及酸醇物质的量比等因素对此反应的影响。实验结果表明,在60℃,4h,n（催化剂）/n（乙酸）/n（乙醇）=1：30：150的条件下,乙酸的收率为94%,乙酸乙酯的选择性为100%。反应结束后,产物和催化剂分层,通过简单的过滤即可分离。催化剂经真空干燥脱水后可重复使用4次,活性变化不大。

The Synthesis of Dodecatungstophosphate and Its Catalytic Application in Esterification

Synthesis of tungstophosphate with organic cation from acidic ionic liquids and 12-tungstophosphoric acid was reported.And its catalytic application in the synthesis of ethyl acetate had also been investigated.The effect of reaction time,reaction temperature,catalyst amount and the molar ratio of acetic acid to ethanol were studied,and found that higher conversion of acetic acid(94%) and good selectivity to ethyl acetate(100%) can be obtained under the following conditions: 60 ℃,4 h,n(catalyst)/n(acetic acid)/n(ethano1)=1∶30∶150.The catalyst was immiscible in the reaction system after reaction,providing a simple separation by decantation.The catalyst can be recycled for 4 times directly after vacuum drying without obvious loss in catalytic activity.