Application of a New Gibbs Energy Equation to Model a Distillation Tower for Production of Pure Ethanol

A steady-state equilibrium-stage model based on MESH equations was proposed to simulate saline extractive distillation columns. The interaction parameters between each component of water-CaCl2 and ethanol-water were obtained from mean ionic activity coefficients and vapor-liquid equilibrium (VLE) experimental data. Additionally, the interaction coefficients for the ethanol-CaCl2 pair were fitted to experimental VLE data which were reported by Nishi for the ethanol-water-CaCl2 system. It should be noted that adjustable parameters between each pair were considered to be temperature dependent. The results confirmed that the proposed model could accurately predict the experimental vapor-liquid equilibrium data for ethanol-CaCl2-water systems. Finally, the validated model was coded using MATLAB software and was solved using the Wang-Henke method, including the VLE and enthalpy models.

提出了基于网格方程的稳态平衡阶段模型，以模拟盐水提取蒸馏柱。从平均离子活性系数和蒸气​​液平衡（VLE）实验数据中获得水-CACL2和乙醇水之间的每个分量之间的相互作用参数。此外，将乙醇-CACL2对的相互作用系数安装在实验性VLE数据中，Nishi报告了乙醇 - 含水量-CACL2系统。应当指出，每对之间的可调节参数被认为是温度依赖性的。结果证实，所提出的模型可以准确预测乙醇-CACL2水系统的实验蒸气平衡数据。最后，使用MATLAB软件对经过验证的模型进行了编码，并使用Wang-Henke方法（包括VLE和焓模型）求解。