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Externally Heat-Integrated Multiple Diabatic Distillation Columns (EHImxDC): Basic Concept and General Characteristics

This paper introduces a new type of distillation columns structure that is externally heat integration in multiple diabatic distillation columns (EHImxDC). By matching the temperatures of different column sections (from the same distillation column or different distillation columns), heat integration of different distillation column sections is carried out to improve the thermodynamic reversibility of the distillation operation. First, the structure of column shell is proposed which may exist in this kind of distillation column. Second, the mathematical model describing EHImxDC is established, and a concise method is proposed to construct EHImxDC structure. At last, based on two conventional distillation columns for the separation of hexane-heptane system and hexane-octanane system, the heat integration in two diabatic distillation columns (EHImtDC) is established. Through simulation, the results show that the reversibility of EHImtDC is significantly higher than that of the conventional distillation colu...