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加压和超临界条件下乙醇分子的缔合
引用本文:刘丽丽,张宝泉,刘秀凤. 加压和超临界条件下乙醇分子的缔合[J]. 化工学报, 2006, 57(6): 1274-1276
作者姓名:刘丽丽  张宝泉  刘秀凤
作者单位:天津大学化工学院,天津,300072;天津大学化工学院,天津,300072;天津大学化工学院,天津,300072
基金项目:高等学校博士学科点专项科研项目
摘    要:引言 在化学和化工领域,分子扩散系数是过程设计和装置优化所需的基本数据之一[1].乙醇作为一种高效绿色溶剂,具有良好的溶剂性能和比较温和的临界温度、临界压力(Tc=514.3 K,pc=6.38MPa),在食品、医药和化工等领域有巨大的应用空间[2].

关 键 词:扩散系数  超临界乙醇  分子缔合作用
文章编号:0438-1157(2006)06-1274-03
收稿时间:2006-02-08
修稿时间:2006-02-082006-03-07

Association of ethanol molecules under compressed and supercritical conditions
LIU Lili,ZHANG Baoquan,LIU Xiufeng. Association of ethanol molecules under compressed and supercritical conditions[J]. Journal of Chemical Industry and Engineering(China), 2006, 57(6): 1274-1276
Authors:LIU Lili  ZHANG Baoquan  LIU Xiufeng
Affiliation:School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Abstract:The diffusion coefficient of naphthalene in supercritical ethanol was measured at 519-534 K and 6.5-16.2 MPa by using the Taylor dispersion technique. The association factor of ethanol molecules was estimated according to the measured experimental data and the infinite diffusion coefficients of naphthalene in high-pressure ethanol published previously. It was shown that the association factor was only a function of temperature varying between 1.8 and 2.8 for liquid and supercritical ethanol. However, the association factor remarkably changed with pressure at the near-critical region of ethanol, reaching a maximum up to 14.
Keywords:diffusion coefficient   supercritical ethanol   molecular association
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