石英毛细管法测定乙醇在超临界二氧化碳中的溶解度  

Determination of ethanol solubilities in supcritical CO_2 by silica capillary method

作　　者：董重[1] 潘志彦[1] 

机构地区：[1]浙江工业大学生物与环境工程学院,浙江杭州310032

出　　处：《浙江工业大学学报》2012年第4期418-421,共4页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(21077092)

摘　　要：二氧化碳作为一种无毒、临界温度低、价格低廉的绿色溶剂,在超临界流体萃取领域应用最为普遍.乙醇作为共溶剂的加入可改善超临界二氧化碳溶剂化能力,极大拓宽其应用范围.研究乙醇在超临界二氧化碳中的溶解度对于含醇物质中醇类的提取以及用醇作共溶剂体系的萃取都非常重要.论文建立了石英毛细管结合显微镜录像溶解度测定系统,在温度为77.6～183.8℃范围内,测得乙醇在超临界二氧化碳中的溶解度为0.085～0.485 mg/mg,发现随着温度的升高溶解度而呈指数增加,并通过实验数据拟合得到乙醇在超临界二氧化碳中的溶解度方程为S=0.0231 e^(0.016T).Supercritical carbon dioxide （SC-CO2） is regarded as a non-toxic and inexpensive solvent with low critical temperature for chemical engineering applications. The solubility of SC- CO2 can be improved and the scope of its application will be widened by the addition of ethanol as a co-solvent. Determination of ethanol solubilities in SC-CO2 is also very important for the extraction of substances in solution containing alcohol or using alcohol as a co-solvent. A new method using a silica capillary, in combination with a microscope and a video recorder system, has been applied to determine the solubilities of ethanol in SC-CO2. The experimental results indicate that the solubilities of ethanol increase from 0. 085 to 0. 485 mg/mg in COz when temperature rise from 77. 6 to 183.8 ℃, and the temperature effect can be represented by an exponential equation S=0. 023 1 e^0.016T

关 键 词：乙醇 超临界二氧化碳 溶解度 石英毛细管法 

分 类 号：TQ021.2[化学工程]