Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (7): 1416.

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High Pressure Phase Equilibrium Model of 2-Butanol in CO2

WANG Lin1*, LUO Jian-Cheng2, LI Ru-Lin2, CHEN Kai-Xun3   

  1. 1. Chemistry and Pharmaceutical Engineering College, Nanyang Normal University, Nanyang 473061, China;
    2. Chemical and Biochemical Engineering College, Nanyang Institute of Technology, Nanyang 473004, China;
    3. Chemical Engineering College, Northwest University, Xi′an 710069, China
  • Received:2009-09-23 Online:2010-07-10 Published:2010-07-10
  • Contact: WANG Lin. E-mail: yueyuewanglin@163.com

Abstract:

High pressure vapor-liquid phase equilibrium data of 2-butanol in CO2 from 323.2 K to 353.2 K were measured by constant-volume visual method. The phase equilibrium model was established by Peng-Robinson equation of state together with van der Waals-2 mixing rule. The solubility equation was correlated by Chrastil semi-empirical equation. Model parameters were calculated by least-squares optimization procedure. The solubility equation obtained was c=ρ3.3617·exp(-2198.8193/T+6.5545), and the solubility heat of the system was -18.2809 kJ/mol.

Key words: Supercritical carbon dioxide; 2-Butanol; Phase equilibrium model; Equation of state; Solubility equation; Chrastil semi-empirical equation

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