A distillation–pervaporation in a single unit (DPSU) column previously was theoretically studied based on mixture thermodynamics. It was observed that the separation inside the DPSU column is not restricted by the thermodynamics of nonideal mixtures as conventional distillation columns, or externally connected distillation–pervaporation (ECDP) columns. In this work, theoretical and experimental evaluations of a DPSU column at infinite reflux ratio was performed for the azeotropic mixture of ethanol–isopropanol–water. Silica membranes were used to recover internally water from the DPSU column. Two DPSU column configurations were proposed: (1) the membrane section located on the top of the column and (1b) an intermediate membrane section. The results showed the distillation boundary was internally overcome by both DPSU column configurations, since the water removal by pervaporation modified the volatility of the components, as compared to a conventional distillation. No thermodynamic restrictions were observed close to the distillation boundaries. In addition, theoretical results from the simplified model derived in previous works were compared to the experimental data. Good agreement between theoretical and experimental results was observed in this work.

中文翻译：

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蒸馏-全蒸发分离共沸混合物的单塔精馏的理论和实验评估

以前基于混合物热力学理论研究了单单元蒸馏（DPSU）蒸馏-全蒸发。据观察，DPSU塔内部的分离不受常规蒸馏塔或外部连接的蒸馏-全蒸发（ECDP）塔等非理想混合物的热力学的限制。在这项工作中，对乙醇-异丙醇-水的共沸混合物，在无限回流比下进行了DPSU色谱柱的理论和实验评估。硅胶膜用于从DPSU柱内部回收水。提出了两种DPSU色谱柱配置：（1）位于色谱柱顶部的膜段和（1b）中间膜段。结果表明，两种DPSU色谱柱配置均在内部克服了蒸馏边界，因为与常规蒸馏相比，通过全蒸发除去水改变了组分的挥发性。在蒸馏边界附近未观察到热力学限制。此外，将先前工作中得到的简化模型的理论结果与实验数据进行了比较。在这项工作中观察到理论和实验结果之间的良好一致性。