酸离子液体在油酸甲酯合成中的催化活性研究

实验合成了4类不同含氮官能团及不同阴离子的Brφnsted酸离子液体,以核磁共振(NMR)、红外光谱(IR)等表征方法对其进行表征。当催化剂用量与油酸用量摩尔比为0.019,醇酸摩尔比为2,反应温度为150℃,反应5 h时,研究油酸和甲醇的酯化反应,考查离子液体种类对酯化反应的催化能力。实验结果表明:离子液体催化剂的活性与其含氮官能团结构和阴离子酸强度以及酸量有关。通过阴阳离子共同作用,得出离子液体([MPy]HSO4)为最佳活性催化剂,油酸转化率达88.21%。

CATALYTIC ACTIVITIES OF ACIDIC IONIC LIQUIDS IN SYNTHESIS OF METHYL OLEATE

Four kinds of Brnsted-acidic ionic liquids were synthesized with nitrogen-contained chemical groups and different anions,and were characterized by nuclear magnetic resonance(NMR) and infrared spectrum(IR).The esterification of oleic acid with methanol was studied and the catalytic activities of the ionic liquids for the esterification were investigated under the following conditions: the molar ratio of the catalyst quantity to oleic acid of 0.019,the molar ratio of alcohol to acid of 2,reaction temperature 150 ℃ and reaction time 5 h.The results showed that the catalytic activities were associated with the structures of nitrogen-contained chemical groups,anionic acid strength and acid volume.Under the coaction of anions and cations,ionic liquids(HSO4) had the best catalytic activity,with 88.21% conversion of oleic acid being achieved.