高等学校化学学报

高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (2): 330.

• 研究论文 • 上一篇    下一篇

超临界CO2+EtOH+CO+H2四元体系压力和温度变化规律及超临界性质的研究

张敬畅, 张建军, 刘微微, 曹维良   

  1. 北京化工大学理学院, 北京 100029
  • 收稿日期:2002-12-25 出版日期:2004-02-24 发布日期:2004-02-24
  • 通讯作者: 张敬畅(1943年出生),女,教授,博士生导师,主要从事物理化学和催化化学研究.E-mail;zhang-jingchang@263.net E-mail:zhang-jingchang@263.net
  • 基金资助:

    国家自然科学基金(批准号;20076004);教育部博士学科点基金(批准号;2000001005)资助

Studies on Relationship Between Temperature and Pressure of the Supercritical CO2+EtOH+CO+H2 Quaternary System and Its Super-critical Properties

ZHANG Jing-Chang, ZHANG Jian-Jun, LIU Wei-Wei, CAO Wei-Liang   

  1. Faculty of Science, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2002-12-25 Online:2004-02-24 Published:2004-02-24

PDF (PC)

摘要： 在5～11MPa的范围内,利用恒容静态平衡法详细考察了CO2密度在0.542～0.590g/cm3范围的不同组成的超临界CO2+EtOH+CO+H2四元体系的压力和温度的变化规律,并测定了相应的临界温度和临界压力.模拟了超临界丙烯氢甲酰反应体系的相行为.结果发现,CO+H2加入量的增多可明显改变超临界CO2+EtOH+CO+H2四元体系的超临界性质,主要表现为该体系的临界温度随着CO和H2摩尔分数的增加而线性降低,临界压力随着CO和H2摩尔分数的增加而线性增加.在相同的CO和H2组成下,超临界四元体系的压力随着体系温度的增加而线性增加,并且p-T线的斜率基本相同.在相同温度下超临界四元体系的压力随着体系中CO和H2摩尔分数的增加线性增加,并且不同温度时的变化率基本相同.

关键词: 超临界CO2+EtOH+CO+H2四元体系, 临界温度, 临界压力, p-T线

Abstract: The dependent relationship between temperature and pressure of supercritical CO2+EtOH+ CO+H2 quaternary system in the pressure range from 5 to 11 MPa in densities of CO2 ranging from 0.542 to 0.590 g/cm3 was investigated by the static visual method in a constant volume. The critical temperature and pressure were experimentally determined simultaneously. The molar fraction of ethanol is 0.2% and that of CO and H2 whose molar ratio is 1;1 changes from 0 to 4%. The phase behavior of the hydroformylation of propylene in supercritical CO2 was simulated. It was found that the addition of CO and H2 could change the supercritical properties of the CO2+EtOH+CO+H2 quaternary system obviously. Its critical temperature decreases linearly while its critical pressure increases linearly with the increasing molar fraction of CO and H2. It was also found that pressure of the quaternary system in definite density of CO2 increases linearly with increasing temperature and the slopes of p-T lines were basically the same. Simultaneously, pressure of the same quaternary system increases linearly with the increasing molar fraction of CO and H2 in definite temperature and the rates of change at different temperatures were almost identical.

Key words: Supercritical CO2+EtOH+CO+H2 quaternary system, Critical temperature, Critical pressure, p-T lines

中图分类号: 

TrendMD: