新型Br(o)nsted-Lewis酸性离子液体的合成及其在松香二聚反应中的应用

合成、表征了新型Bronsted-Lewis酸性离子液体1-(3-磺酸)-丙基-3-甲基咪唑氯锌酸盐([HO3S-(CH2)3-mim]Cl-ZnCl2),并将其用于催化松香二聚反应.结果表明,[HO3S-(CH2)3-mim]Cl-ZnCl2(ZnCl2摩尔分数x＞0.5)为Bronsted和Lewis双酸性,且以[HO3S-(CH2)3-mim]Cl-ZnCl2 (x=0.64)的催化性能较佳.在松香5.0 g,甲苯15 g,离子液体质量分数5%,反应温度110℃和反应时间4 h的较佳实验条件下,所得产物聚合松香的软化点为118 ℃.此外,该催化剂的使用有利于产物的分离且分离的离子液体催化剂具有良好的重复使用性能.

A Br(o)nsted-Lewis Acidic Ionic Liquid:Its Synthesis and Use as the Catalyst in Rosin Dimerization

Bronsted-Lewis acidic ionic liquids 1-(3-sulfonic acid)-propyl-3-methylimidazole chlorozincinates([HO3S-(CH2)3-mim]Cl-ZnCl2)were synthesized and characterized.The characterization results indicated that [HO3S-(CH2)3-mim]Cl-ZnCl2 (molar fraction of ZnCl2 x＞0.5) had both Bronsted and Lewis acid properties.The catalytic properties of these ionic liquids were investigated using the dimerization of rosin,and it was shown that ionic liquid[HO3S-(CH2)3-mim]Cl-ZnCl2(x=0.64) was a good catalyst.Under the optimum conditions for polymerization,i.e.,rosin 5.0 g,toluene 15 g,the mass fraction of ionic liquid 5%,reaction temperature 110 ℃,and reaction time 4 h,a product with the softening point of 118 ℃ was obtained.It was also found that the product Was easily separated from the reaction mixture and the ionic liquid catalyst had good reusability.