Brønsted酸性离子液体催化酯化2,6-萘二甲酸二甲酯的合成  

Synthesis of dimethyl 2,6-naphthalate via esterification catalyzed by Brønsted acidic ionic liquid

作　　者：秦春曦 陈亮 赵玲[2] QIN Chun-xi;CHEN Liang;ZHAO Ling(State Key Laboratory of Green Chemical Engineering and Industrial Catalysis,Sinopec Shanghai Research Institute of Petrochemical Technology,Shanghai 201208,China;State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]中国石化上海石油化工研究院绿色化工与工业催化国家重点实验室,上海201208 [2]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《现代化工》2020年第6期179-184,共6页Modern Chemical Industry

摘　　要：采用两步法合成了[MPSIm][HSO4]、[EPSIm][HSO4]、[BPSIm][HSO4]、[HPSIm][HSO4]、[MPSIm][H2PO4]和[MPSIm][pTS]6种Brønsted酸性离子液体,分别考察了其在酯化合成2,6-萘二甲酸二甲酯(2,6-NDC)过程中的催化性能。结果表明,[MPSIm][HSO4]的催化活性最高;当采用[MPSIm][HSO4]催化剂时,在反应温度为137℃、反应时间为4 h、醇酸质量比为7.5:1和催化剂质量为甲醇质量2%的条件下,2,6-NDA的转化率达到99.1%,2,6-NDC的收率达到92.9%,且催化剂循环使用10次,[MPSIm][HSO4]的催化活性并没有显著下降。与传统硫酸催化剂相比,[MPSIm][HSO4]显著降低了甲醇醚化的副反应。Six kinds of Brønsted acidic ionic liquids(BILs),including[MPSIm][HSO4],[EPSIm][HSO4],[BPSIm][HSO4],[HPSIm][HSO4],[MPSIm][H2PO4]and[MPSIm][pTS],are synthesized by two-step method.Their catalytic performance is evaluated in synthesis of dimethyl 2,6-naphthalate through esterification process.It is found that[MPSIm][HSO4]shows the highest catalytic activity among six BILs.The conversion rate of 2,6-naphthalene dicarboxylic acid and the yield of dimethyl 2,6-naphthalate can reach 99.1%and 92.9%,respectively,under the optimum reaction conditions that the temperature is at 137℃,reaction lasts for 4 h,the mass ratio of methanol to 2,6-naphthalene dicarboxylic acid is 7.5:1 and the dosage of[MPSIm][HSO4]catalyst is 2 wt%of the mass of methanol.The catalytic activity of[MPSIm][HSO4]has no significant drop after being reused for ten times.Moreover,comparing with traditional catalyst H2SO4,[MPSIm][HSO4]can obviously inhibit the side reaction of methanol etherification.

关 键 词：离子液体 酯化 2 6-萘二甲酸二甲酯 

分 类 号：TE9[石油与天然气工程—石油机械设备]