离子液体的酸性测定及其催化的异丁烷/丁烯烷基化反应  

Determination of Acidity of Ionic Liquids and Alkylation of Isobutane with Butene by Chloroaluminate Ionic Liquids

作　　者：杨雅立[1] 王晓化[1] 寇元[1] 

机构地区：[1]北京大学化学与分子工程学院,北京100871

出　　处：《催化学报》2004年第1期60-64,共5页

基　　金：国家重点基础研究发展规划(973计划)资助项目(G2 0 0 0 0 480 0 2 )

摘　　要：初次采用吡啶红外光谱探针法测定了离子液体的酸性 .该方法能鉴别离子液体的Br¨onsted/Lewis酸类型 ,并可以粗略指示离子液体的Lewis酸强度 .将 [bmim]Cl/AlCl3 类离子液体用于催化异丁烷与丁烯的烷基化反应 ,考察了酸强度、反应温度、压力和时间对产物分布的影响 ,并在最优操作条件下与传统的H2 SO4催化剂进行了比较 .结果表明 ,离子液体对烷基化反应的催化活性和选择性与H2 SO4可比 ,而且它更容易与产物分离 ,不经任何处理可循环利用 10次 .A novel method was established to determine the acidity of ionic liquids by using pyridine as IR spectroscopic probe. This method can be used to identify the Brnsted/Lewis acidity of ionic liquids, and meanwhile roughly delineate the strength of the Lewis acidity. Cl/AlCl 3 was used as a catalyst in the alkylation of isobutane with butene. The effects of operating variables were investigated and optimized. Under the optimized operation conditions, the catalytic performance of the ionic liquid is comparable with that of H 2SO 4. In addition, the ionic liquid can be easily separated from the products and reused directly without any treatment for about 10 times.

关 键 词：离子液体 酸性 吡啶探针 红外光谱法 异丁烷 丁烯 烷基化反应 

分 类 号：O643.3[理学—物理化学]