高等学校化学学报

高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (7): 1298.

• 研究论文 • 上一篇    下一篇

超临界CO2+碳酸二乙酯二元体系高压气-液相平衡

赵雪峰, 陈丽, 田宜灵, 张凤才, 薛源   

  1. 天津大学理学院化学系, 天津 300072
  • 收稿日期:2003-08-26 出版日期:2004-07-24 发布日期:2004-07-24
  • 通讯作者: 田宜灵(1946年出生),男,教授,博士生导师,主要从事高压相平衡、超临界流体性质及应用和绿色化学品的开发研究.E-mail:Tianyiling@eyou.com E-mail:Tianyiling@eyou.com
  • 基金资助:

    天津大学“九八五”项目(批准号:K09070)资助

High Pressure Vapour-liquid Equilibrium of Supercritical Carbon Dioxide+Diethyl Carbonate System

ZHAO Xue-Feng, CHEN Li, TIAN Yi-Ling, ZHANG Feng-Cai, XUE Yuan   

  1. Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
  • Received:2003-08-26 Online:2004-07-24 Published:2004-07-24

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摘要： 在带有石英视窗的可变体积高压釜内,于333,353,373和393K等4个温度下,测定了3.0～15.0MPa范围内超临界CO2与碳酸二乙酯(DEC)二元体系的气-液平衡数据.结果表明,当温度恒定时,随着压力的增大,液相中超临界CO2的浓度急剧增大,气相中碳酸二乙酯的浓度缓慢增加.根据实验结果推测出了体系的pc,Tc,xc和Vc等临界性质.

关键词: 高压相平衡, 碳酸二乙酯, 超临界二氧化碳, 临界性质

Abstract: Vapor-liquid equilibrium data of the supercritical carbon dioxide+diethyl carbonate system were measured isothermally at 333, 353, 373 and 393 K in the pressure range of 3-15 MPa. The measurements were carried out in a cylindrical autoclave with a movable piston and an observed window. It is shown that the solubilities of supercritical CO2 in DEC increase drastically with the increase of pressure at the given temperature, but the content of DEC in gas phase increase faintly. The critical values pc,Tc,xc and Vc of the binary system were predicted.

Key words: High-pressure phase equilibrium, Diethyl carbonate, Supercritical CO2, Critical properties

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