This study addresses computational fluid dynamics (CFD) for designing internally heat-integrated pressure-swing distillation (HIPSD) with improved energy efficiency in azeotropic distillation. An extended concept of pinch pressure is applied to determine the operating pressure of the HIPSD in a double annular column configuration for the circumvention of a distillation boundary and adequate heat transfer. For the separation of a highly azeotropic ternary mixture of butyl acetate, butanol, and water, the combination of a single unit of HIPSD and a decanter is employed. This azeotropic mixture is separated in different design alternatives for the given initial feed compositions. In each sequence, the heat transfer rate inside the HIPSD was calculated by the CFD method, and the total utility consumption accordingly decreased by 9.72% and 15.44%. The reboiler and condenser duty in the HIPSD were reduced by up to 48.65%. The separation efficiency in the condenser of the high-pressure column was improved enough to reach a zero reflux by the internal heat integration.

这项研究解决了计算流体动力学 (CFD)，用于设计内部热集成变压蒸馏 (HIPSD)，以提高共沸蒸馏的能量效率。应用夹点压力的扩展概念来确定双环形塔配置中 HIPSD 的操作压力，以绕过蒸馏边界和充分的热传递。对于醋酸丁酯、丁醇和水的高度共沸三元混合物的分离，采用单个 HIPSD 单元和倾析器的组合。对于给定的初始进料组合物，该共沸混合物以不同的设计备选方案分离。在每个序列中，HIPSD内部的传热率通过CFD方法计算，总效用消耗相应减少了9.72%和15.44%。HIPSD 中再沸器和冷凝器的负荷降低了 48.65%。高压塔冷凝器的分离效率提高到足以通过内部热集成达到零回流。