红外光谱测量法研究超临界CO_2中夹带剂与溶质的相互作用  

Interaction of entrainer and solute in supercritical CO_2 by using infrared spectroscopy

作　　者：袁萍[1] 蔡建国[1] 彭国荣[1] 孟莺[1] 邓修[1] 

机构地区：[1]华东理工大学化学工程研究所,上海200237

出　　处：《化工学报》2007年第12期3092-3096,共5页CIESC Journal

基　　金：国家自然科学基金项目(20276017)~~

摘　　要：利用红外光谱技术研究了在超临界CO2中加入不同夹带剂时,水杨酸中基团的伸缩振动频率的位移及夹带剂与溶质的相互作用。以乙醇为夹带剂时,水杨酸中CO基团、O—H基团的伸缩振动频率均向低频方向移动;以丙酮为夹带剂时,水杨酸中CO基团伸缩振动频率向高频方向移动。研究结果表明:当以乙醇为夹带剂时,水杨酸的溶解度远大于以丙酮为夹带剂时的结果,夹带剂对溶质增溶的作用能力,形成氢键的作用远大于溶剂极性的作用。The shifts of stretching vibration frequency of the radicals in salicylic acid and the interaction of entrainer and solute in supercritical CO2 with the addition of entrainer by using infrared spectroscopy were studied.The stretching vibration frequency of both radicals CO and O—H shifted towards a lower frequency with ethanol as entrainer,while the stretching vibration frequency of radical CO shifted towards a higher frequency with acetone as entrainer.The results showed that the solubility of salicylic acid in supercritical CO2 with ethanol as entrainer was much higher than that with acetone as entrainer.The influence of the action of hydrogen bond was much stronger than the action of solvent polarity on the increase of solute solubility.

关 键 词：超临界CO2 红外光谱 水杨酸 分子作用 

分 类 号：TQ028[化学工程]