氯化1-氨基聚醚-3-甲基咪唑离子液体的制备与催化性能

发布时间：2018-04-23 23:33

  本文选题：离子液体 + 催化剂　； 参考：《化工进展》2017年02期

【摘要】：首先以环氧氯丙烷为原料,通过开环聚合得聚环氧氯丙烷(PECH),再通过溴化和氨化等方法得到端氨基的聚环氧氯丙烷,再将其与N-甲基咪唑反应,制备氯化1-氨基聚醚-3-甲基咪唑离子液体([H_2N-PECH-MIM]Cl)催化剂,并利用红外(IR)和核磁(NMR)对其化学结构进行表征,利用热重分析仪(TGA)和凝胶渗透色谱仪(GPC)对其热性能和分子量进行了测试。然后用制备的高分子离子液体[H_2N-PECH-MIM]Cl催化环氧丙烷与二氧化碳合成碳酸丙烯酯,以纯度、转化率、选择性和转化频率为考察指标,研究催化温度、压力、循环使用次数对催化性能的影响,并比较了其与溴化1-乙胺基-3-甲基咪唑离子液体[Ae MIM]Br的催化性能。结果表明,制备的高分子催化剂[H_2N-PECH-MIM]Cl结构正确,产率为71%,其催化性能远远优于小分子离子液体[Ae MIM]Br,可在不用助催化剂的温和条件下即可高效完成催化过程,且循环使用10次基本不影响其催化活性。当催化温度为90℃,压力为1.8MPa,用量为1.0%时,纯度为99.0%,转化率为100%,选择性高达96.9%,转化频率TOF为3848h~(-1)。
[Abstract]:Poly (epichlorohydrin) was synthesized by ring-opening polymerization of epichlorohydrin, then amino terminated polyepichlorohydrin was synthesized by bromination and ammoniation, and then reacted with N-methylimidazole. 1-aminopolyether 3-methyl imidazole chloride ionic liquid ([H_2N-PECH-MIM] Cl) catalyst was prepared. Its chemical structure was characterized by IR and NMR. The thermal properties and molecular weight of the catalyst were measured by thermogravimetric analyzer (TGA) and gel permeation chromatography (GPC). Propylene carbonate was synthesized from propylene oxide and carbon dioxide by using the prepared polymer ionic liquid [H_2N-PECH-MIM] Cl as catalyst. The catalytic temperature and pressure were studied with purity, conversion, selectivity and conversion frequency as the indexes. The effect of recycling times on the catalytic performance was compared with that of 1-ethylamino-3-methyl imidazole bromide ionic liquid [Ae MIM] Br. The results show that the structure of [H_2N-PECH-MIM] Cl is correct and the yield is 71%. The catalytic performance of the prepared polymer catalyst [H_2N-PECH-MIM] Cl is much better than that of small molecular ionic liquid [Ae MIM] Br. the catalytic process can be completed efficiently under mild conditions without co-catalyst. The catalytic activity was not affected by 10 cycles of recycling. When the catalytic temperature is 90 鈩，

本文编号：1794159