酸功能化离子液体催化合成马来酸二异辛酯

合成了4种酸功能化离子液体,由IR、1HNMR对其结构进行了确证,并将其用于催化合成马来酸二异辛酯。结果表明,以离子液体[HSO3-pMIM]HSO4为催化剂,n(马来酸酐)∶n(异辛醇)=1∶2.2,马来酸酐0.1 mol,催化剂用量2.3 g,回流反应2.0 h条件下,马来酸酐酯化率达98.5%。且该离子液体与反应产物易于分离。反应后的离子液体[HSO3-pMIM]HSO4未经处理可重复使用7次,酯化率仍高于97.5%,第7次使用后用水萃取,其回收率为68.5%,补加至第一次用量再次进行实验,得酯化率为98.5%。

Synthesis of Diisooctyl Maleate Catalyzed by Acidic Functionalized Ionic Liquids

Four acidic functionalized ionic liquids were synthesized and their structure were confirmed by IR and 1HNMR.In the presence of these ionic liquids as catalyst,the reaction of synthesizing diisooctyl maleate was studied.The results showed that using [HSO3-PMIM]HSO4 as catalyst,with n(maleic anhydride)∶n(isooctyl alcolol)=1∶2.2,maleic anhydride 0.1 mol and ionic liquid 2.3 g,and reacting for 2.0 h,the conversion of maleic anhydride reached 98.5%.Furthermore,[HSO3-PMIM]HSO4 were immiscible with the product and could be reused 7 times without any disposal and the conversion was still over 97.5%.After seventh time,we extracted [HSO3-PMIM]HSO4 with distilled water and the recovery was 68.5%.When we replenished [HSO3-PMIM]HSO4 to the original amount and carried out the experiment again,the conversion of maleic anhydride reached 98.5%.