超临界CO2与叔丁醇二元系统高压相平衡研究

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (8): 1631.

超临界CO₂与叔丁醇二元系统高压相平衡研究

王琳^1,2, 李入林³, 孙林涛¹, 陈开勋¹

1. 西北大学化工学院, 西安 710069;
2. 南阳师范学院化学与制药工程学院, 南阳 473061;
3. 南阳理工学院生化系, 南阳 473004

收稿日期:2008-11-03 出版日期:2009-08-10 发布日期:2009-08-10
通讯作者: 陈开勋, 男, 教授, 主要从事超临界流体技术及相关研究. E-mail: kxchen@nwu.edu.cn

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

摘要/Abstract

摘要：

采用固定体积可视观察法测量装置测定了CO₂与叔丁醇在323.2~353.2 K温度范围内于不同压力下的平衡数据, 并运用Peng-Robinson状态方程(PR)和Van der Waals-2混合规则建立了相平衡模型, 通过非线性最小二乘法优化计算得到了不同温度下的模型参数. 并得到了模型参数与温度的表达式, 分别为k₁₂=-199.2066+1.8136T-0.00548T²+5.50×10^-6T³; n₁₂=-384.5626+3.4960T-0.01056T²+1.06×10^-5T³.获得了此体系在不同组成下的临界压力、临界温度、临界摩尔体积、临界压缩因子和临界密度等临界性质. 研究结果表明, CO₂与叔丁醇二元体系的临界温度、临界压力和临界压缩因子均随着临界CO₂组成的增加而降低.

关键词: 超临界二氧化碳; 叔丁醇; 相平衡模型; 临界性质

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:

王琳, 李入林, 孙林涛, 陈开勋. 超临界CO₂与叔丁醇二元系统高压相平衡研究. 高等学校化学学报, 2009, 30(8): 1631.

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

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超临界CO₂与叔丁醇二元系统高压相平衡研究

Studies on Phase Equilibrium of Tertbutanol in Supercritical CO₂

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