Pressure Swing Distillation for Separation of Ethyl Acetate and Ethanol in Sub-plateau Region

• 作 者: Wang Keliang Li Jing Lian Minglei Li Zhi Du Tingzhao
• 机 构: College of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui 553004“,”No
• 出 处: 中国炼油与石油化工（英文版）
• 发表日期: 2020年1期
• 关键词: pressureswingdistillation ethylacetate ethanol azeotrope heat-integrated

The pressure swing distillation (PSD) process for separation of ethyl acetate and ethanol mixture in sub-plateau region was simulated. The pressure of low-pressure column was set at 0.086 MPa, which is in accordance with the atmospheric pressure in the Yunnan-Guizhou region, while the pressure of high-pressure column was determined as 0.304 MPa. Various design parameters, including the plate number, the relfux ratio, and the feeding positions, were optimized, while taking into consideration the total annual cost (TAC). Furthermore, based on the general PSD, the partially heat-integrated pressure swing distillation (PHIPSD) process and the fully heat-integrated pressure swing distillation (FHIPSD) process were also studied. The processes with heat integration showed lower capital cost and lower energy cost, and TACs of the PHIPSD and FHIPSD decreased to 377.21×103$/a and 371.66×103$/a, respectively. Compared with the non-heat integrated process, TACs of the PHIPSD and FHIPSD could be reduced by 27.82％and 28.89％, respectively. The results showed that the FHIPSD process could effectively separate the ethyl acetate-ethanol mixture, and it was more economical and reasonable. This work can provide some technical references for the separation of such azeotropes in the sub-plateau region.