Study on the Solubility of Substances in Supercritical Fluids( I )

谭飞; 杨基础; 沈忠耀; 汪家鼎

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Study on the Solubility of Substances in Supercritical Fluids( I )

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- Study on the Solubility of Substances in Supercritical Fluids( I )
- CIESC Journal Issue 4, (1989)
- 作者机构：
  
  清华大学化学工程系,清华大学化学工程系,清华大学化学工程系,清华大学化学工程系 ,北京,北京,北京,北京
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 August 1989，
  
  Published：25 August 1989
- 稿件说明：
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谭飞, 杨基础, 沈忠耀, et al. Study on the Solubility of Substances in Supercritical Fluids( I )[J]. CIESC Journal, 1989, (4).
DOI：

谭飞, 杨基础, 沈忠耀, et al. Study on the Solubility of Substances in Supercritical Fluids( I )[J]. CIESC Journal, 1989, (4). DOI：

摘要

本文分析了超临界流体萃取过程的特点.认为超临界流体的P-V-T行为可采用某种气体状态方程来描述.在分离作用机理上更近于液液萃取过程.提出了其萃取历程的物理化学模式

据此推导了超临界流体中物质溶解度计算公式.通过对此式的剖析和简化

得到了固体及液体纯物质在超临界流体中溶解度的半理论、半经验计算公式.并用文献发表的实验数据对半经验式的适用性进行验算

获得了较满意的结果

平均偏差≤10%.

Abstract

The calculation of solubilities of substances in a supercritical fluid (SCF) is one of the most important thermodynamic calcalations. This paper discusses the characteristics of extraction with SCF. The P-V-T properties of SCF can be described by an equation of state of gases and the separation mechanism of SCF extraction is fairly similar to that of liquid-liquid extraction. Besides

this paper puts forward a physical model of SCF extraction ma-chanism. Based on this model

a general formula for calculating solubilities of substances in a SCF could be derived as fellows: This formula could be simplified and modified as a semi-empirical correlation: whers

α is an enhancement factor of solubilities. For pure substances a good agreement between experimental results and calculation data with this semi-empirical correlation

was obtained with an average error less than tan percent.

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