Studies on Phase Equilibrium of Tertbutanol in Supercritical CO2

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (8): 1631.

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Studies on Phase Equilibrium of Tertbutanol in Supercritical CO₂

WANG Lin^1,2, LI Ru-Lin³ , SUN Lin-Tao¹ , CHEN Kai-Xun^1*

1. Chemical Engineering College, Northwest University, Xi′an 710069, China;
2. Chemistry and Pharmaceutical Engineering College, Nanyang Normal University, Nanyang 473061, China;
3. Biochemical Engineering College, Nanyang Science Institute, Nanyang 473004, China

Received:2008-11-03 Online:2009-08-10 Published:2009-08-10
Contact: CHEN Kai-Xun. E-mail: kxchen@nwu.edu.cn

Abstract

Abstract:

Vapor-liquid phase equilibrium data of tertbutanol in the SC-CO₂ from 323.2 K to 353.2 K were determined by constant-volume visual method. The phase equilibrium model was established by Peng-Robinson equation of state and Vander Waals-2 mixed regulation. Model parameters were obtained by nonlinear least square method optimization calculation. Furthermore, the correlation equations of model parameters vs. temperature were obtained: k₁₂=-199.2066+1.8136T-0.00548T²+5.50×10^-6T³, n₁₂=-384.5626+3.4960T-0.01056T²+1.06×10^-5T³. Critical properties of critical pressure, critical temperature, critical molar volume and critical density were deduced. The results showed that critical temperature, critical pressure and critical compressibility factor of CO₂-tertbutanol system would decrease with the increasement of critical CO₂ content.

Key words: Supercritical carbon dioxide; Tertbutanol; Phase equilibrium model; Critical property

TrendMD:

WANG Lin, LI Ru-Lin, SUN Lin-Tao , CHEN Kai-Xun*. Studies on Phase Equilibrium of Tertbutanol in Supercritical CO₂[J]. Chem. J. Chinese Universities, 2009, 30(8): 1631.

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Studies on Phase Equilibrium of Tertbutanol in Supercritical CO₂

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