微波作用下苄苯醚催化转移氢解反应动力学  

A kinetics study on microwave-assisted catalytic hydrogenolysis of benzyl phenyl ether

作　　者：熊俊[1] 潘晶莹[1] 吕秀阳[1] 

机构地区：[1]浙江大学高压过程装备与安全教育部工程研究中心,浙江杭州310027

出　　处：《化工学报》2012年第5期1437-1442,共6页CIESC Journal

基　　金：国家自然科学基金项目(20976160);中央高校基本科研业务费专项资金~~

摘　　要：引言 木质素是由含氧苯丙烷单元构成的一种复杂三维网状聚合物,是构成植物骨架的主要成分之一。在自然界中,木质素的储量仅次于纤维素,估计每年全世界由植物生长可产生1500亿吨木质素[1]。With benzyl phenyl ether（BPE） as a model compound of lignin,catalytic hydrogenolysis kinetics of benzyl phenyl ether via hydrogen-transfer was studied at the temperature of 413.15—443.15 K,using toluene-4-sulfonic acid（PTSA）as catalyst and 1,2,3,4-tetrahydronaphthalene as hydrogen-donor solvent.Batch reactors with and without microwave-assisted were employed.The first order kinetic model was used to fit the kinetics data.The results indicated that for microwave-assisted reactor,conversion of BPE was greatly improved with increase of PTSA and 1,2,3,4-tetrahydronaphthalene concentration.When both concentrations are 0.1 g·ml-1,apparent activation energies of BPE hydrogenolysis reaction estimated were 52.45 kJ·mol-1 for microwave-assisted reactor and 87.82 kJ·mol-1 for batch one,which means that microwave can make activation energy of hydrogenolysis reaction greatly decrease.This work may provide an alternative way for large-scale utilization of lignin.

关 键 词：木质素 苄苯醚 供氢剂 微波 催化转移氢解反应 反应动力学 

分 类 号：TQ032[化学工程] O643.32[理学—物理化学]