杂多酸离子液体催化剂的制备及其合成可降解聚酯PES的催化性能

Preparation of heteropolyacid ionic liquid catalyst and its catalytic performances for synthesizing degradable polyester PES

为了分析杂多酸离子液体催化剂的催化性能,以Fe为中心杂原子、Mo为配位原子,制备了杂多酸阴离子,并将其与1-羟丙基-3-甲基咪唑溴盐通过离子交换反应制备功能化杂多酸离子液体催化剂([HO-(CH_(2))_(2)-mim]_(5)[Ti(H_(2)O)FeMo_(11)O_(39)])。利用FT-IR、UV、XRD和TGA对所制催化剂进行结构表征与性能测试,通过正交试验优化工艺参数,探讨投料比、催化剂用量、酯交换反应温度和时间对其催化性能的影响。结果表明:所制催化剂结构正确,热性能良好,并具有较好催化效果。最佳工艺条件为:投料比2,催化剂质量分数1.0%,反应温度220℃,反应时间5 h,该条件下PES收率为75.32%。

In order to analyze the catalytic performances of heteropolyacid ionic liquid catalyst,a functionalized heteropolyacid ionic liquid catalyst([HO-(CH_(2))_(2)-mim]5[Ti(H_(2)O)FeMo_(11)O_(39)])was prepared by ion exchange between the heteropolyacid anion prepared with Fe as the central heteroatom and Mo as the coordination atom and 1-hydroxypropyl-3-methylimidazole salt cation.The FT-IR,UV,XRD and TGA were used to characterize the structure of the catalyst,the process parameters were optimized by orthogonal tests,and the effects of feed ratio,catalyst dosage,temperature and time of transesterification reaction on the catalytic performances of heteropolyacid ionic liquid catalyst were discussed.The experimental results show that the as-proposed catalyst has correct structure,well thermal performance and good catalytic effect.In the optimum process conditions,feed ratio is 2,mass fraction of catalyst is 1.0%,reaction temperature is 220℃and reaction time is 5 h.The PES yield prepared under the optimum condition is 75.32%.