超临界流体吸附法制备负载化离子液体[Bmim][BF_4]@SBA-15  

Preparation of supported ionic liquids [Bmim][BF_4]@SBA-15 using supercritical fluid adsorption method

作　　者：甄梦媛 李卓剑 徐琴琴[1] 詹华书 银建中[1] ZHEN Mengyuan;LI Zhuojian;XU Qinqin;ZHAN Huashu;YIN Jianzhong(School of Chemical Engineering and Safety, Dalian University of Technology, Dalian 116024, China;National Joint Engineering Center of Supercritical Fluid Technology and Equipment, Zunyi 563003, China)

机构地区：[1]大连理工大学化工机械与安全学院,辽宁大连116024 [2]超临界流体技术与装备国家地方联合工程中心,贵州遵义563003

出　　处：《应用科技》2019年第2期98-103,共6页Applied Science and Technology

基　　金：国家自然科学基金项目(U1662130)

摘　　要：离子液体是一种优良的绿色溶剂,可用作分离或反应介质。将离子液体负载于多孔材料制备得到负载化离子液体,可以在吸附或反应中增加离子液体的表面积,减少离子液体用量,且因呈固态较易分离。采用超临界流体吸附法制备负载化离子液体,在乙醇作为共溶剂的条件下考察不同参数对负载量的影响,并对制备样品进行TG与N2吸附表征。结果表明,离子液体浓度、时间与气液流量为实验中影响较为关键的因素。在负载量相当时,超临界流体吸附法制备样品相较于浸渍法以及超临界二氧化碳辅助法具有更优良的孔道性能,更有利于作为吸附剂或催化剂使用。Ionic liquids are a kind of green solvent for separation and reaction.Supported ionic liquids prepared by immobilizing ionic liquids on porous materials applied in adsorption and reaction could increase the interface area of ionic liquids,reduce the use of ionic liquids,and be easily separated because of its solidity state.The effect of different parameters on loading was investigated by using supercritical fluid adsorption method with ethanol as co-solvent.The samples were characterized by TG and nitrogen adsorption to compare the effect of different conditions on the preparation of composites.The results show that the key factors for preparation are ionic liquid concentration,time,and flow rate of liquid and gas.Samples prepared by supercritical fluid adsorption method have larger surface area and pore volume compared with impregnation and supercritical carbon dioxide assisted method when loadings are similar.

关 键 词：超临界流体吸附法 离子液体 负载化 乙醇 超临界二氧化碳 共溶剂 负载量 表征 

分 类 号：TQ424[化学工程]