Thermodynamic Modeling of High-pressure Equilibrium Data for the Systems L-lactic Acid + (Propane + Ethanol) and L-lactic Acid + (Carbon Dioxide + Ethanol)

M. Meireles, I. C. Debien, A. A. Rigo, M. Corazza, M. Mazutti, J. V. Oliveira
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Abstract

This short communication reports the thermodynamic modeling of high-pressure equilibrium data (cloud points) for the systems L-lactic acid + (propane + ethanol) and L-lactic acid + (carbon dioxide + ethanol) from 323.15 K to 353.15 K and at pressures up to 25 MPa.The experimental data were modeled using the Peng-Robinson equation of state with the classical van der Waals quadratic mixing rule (PR-vdW2) and with the Wong-Sandler mixing rule (PR- WS). It is shown that the PR-vdW2 and PR-WS models were both able to satisfactorily represent the phase behavior of the system L-lactic acid + (carbon dioxide + ethanol). However, for the system L-lactic acid + (propane + ethanol), the PR-vdW2 model was not able to appropriately describe its phase behavior.
l -乳酸+(丙烷+乙醇)和l -乳酸+(二氧化碳+乙醇)体系高压平衡数据的热力学建模
这篇简短的通讯报告了l -乳酸+(丙烷+乙醇)和l -乳酸+(二氧化碳+乙醇)系统在323.15 K到353.15 K和压力高达25 MPa时的高压平衡数据(云点)的热力学建模。实验数据采用经典范德华二次混合规则(PR- vdw2)和Wong-Sandler混合规则(PR- WS)的Peng-Robinson状态方程进行建模。结果表明,PR-vdW2和PR-WS模型均能较好地表征l -乳酸+(二氧化碳+乙醇)体系的相行为。然而,对于l -乳酸+(丙烷+乙醇)体系,PR-vdW2模型不能恰当地描述其相行为。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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