合成乙酸丁酯的热泵分隔壁反应精馏流程模拟与优化  

Energy-Saving Study for Butyl Acetate Synthesis in Reactive Divided-Wall Column via Vapor Recompression Heat Pump

作　　者：陈丽娟 冯申尧 叶青[1] CHEN Lijuan;FENG Shenyao;YE Qing(Institute of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《石油学报（石油加工）》2020年第4期746-755,共10页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：江苏高校品牌专业建设工程项目(PPZY2015B145)资助。

摘　　要：在合成乙酸丁酯的工艺中,将热泵技术用于其分隔壁反应精馏流程。针对这种塔顶、塔釜流股温差较大的体系,基于热泵技术提出了3种不同的分隔壁反应精馏流程,分别为:塔底换热的热泵分隔壁反应精馏流程、带中间换热的热泵分隔壁反应精馏流程和带预热器及中间换热的热泵分隔壁反应精馏流程。优化分析这3种精馏流程的能耗和年总费用(TAC),并与常规分隔壁反应精馏流程进行对比。结果表明,热泵技术的应用使分隔壁反应精馏流程的能耗和费用都显著地降低;带预热器和中间换热的热泵分隔壁反应精馏流程是该合成工艺中反应精馏流程的优化选择;与常规分隔壁反应精馏流程相比,在回收期为8 a时带预热器和中间换热的热泵分隔壁反应精馏流程可以使能耗、CO2排放和年总费用分别降低35.18%、71.53%和35.35%。Integration of vapor recompression heat pump with reactive divided-wall column(RDWC-HP)is proposed for butyl-acetate synthesis process.Three different RDWC-HP schemes are suggested with large differential temperatures between top and bottom streams for butyl-acetate synthesis through esterification reaction.The three schemes are named as RDWC-HP-RD,RDWC-HP-IR and RDWC-HP-PRE-IR,correspondingly.The energy consumption and TAC of the three schemes are optimized and compared with those from the conventional reactive divided-wall column.Calculation results indicate that application of vapor recompression heat pump can significantly reduce energy consumption and TAC of the reactive divided-wall column,and RDWC-HP-PRE-IR scheme can save 35.18%TUC,71.53%CO2 emission and 35.35%TAC with a payback period of 8 a.

关 键 词：乙酸丁酯 分隔壁反应精馏塔 热泵技术 中间换热 节能 

分 类 号：TQ028.1[化学工程]