微波加热和常规加热下功能化离子液体催化合成丁二酸二辛酯

分别在微波辐射和常规加热下,以具有丙烷磺酸基功能基团的离子液体为催化剂催化丁二酸和正辛醇 合成丁二酸二辛酯,考察了其阴、阳离子对催化剂活性的影响.相比常规加热,微波加热提高了反应效率,缩短了反应时间.以 PyPS]HSO4为催化剂,研究了催化剂用量、醇酸比和反应时间对酯化率的影响.结果表明:当催化剂用量为丁二酸的3wt％,酸醇比(丁二酸∶正辛醇)1∶4,反应温度150℃,反应时间15 min,功率400W时,酯化率达到95.74％.此外,微波辐射下PyPS]HSO4催化剂重复使用6次后活性没有明显降低,酯化率仍有93.58％.

Synthesis of dioctyl succinate catalyzed by task-specific ionic liquids under microwave irradiation and electrical heating

A series of task-specific ionic liquids(TSILs) that bear an alkane sulfonic acid group were synthesized.Esterification of succinic acid with octanol was investigated using these TSILs as catatlystys in both microwave irradiation and traditional heating ways.Effect of the anion and cation of the TSILs on catalytic performance was also investigated.Compared with electrical heating way,TSILs exhibited a enhanced reaction efficiency and short reaction time under microwave irradiation.Effect of catalyst amount,reaction time and the acid-to-alcohol ratio on conversion of succinic acid was systematically investigated.The results showed that the conversion of succinic acid reached 95.74% by usingPSPy]HSO 4 as the catalyst under the conditions of n succinic acid ∶n octanol = 1 ∶4,3 wt% of succinic acid for TSILs,150℃,15 min and 400 W.In addition,thePSPy]HSO 4 exhibited excellent stability and catalytic activity.It could be reused six times without considerable loss of activity and still had a conversion of 93.58%.