Separation of n-heptane/isobutanol via eco-efficient vapor recompression-assisted distillation:process optimization and control strategy  

作　　者：Wei Hou Qingjun Zhang Aiwu Zeng 

机构地区：[1]State Key Laboratory of Chemical Engineering,School of Chemical Engineering and Technology,Tianjin University,Tianjin,300350,China [2]Chemical Engineering Research Center,Collaborative Innovative Center of Chemical Science and Engineering,Tianjin,300072,China

出　　处：《Frontiers of Chemical Science and Engineering》2021年第5期1169-1184,共16页化学科学与工程前沿（英文版）

摘　　要：In this study,vapor recompression and heat integration assisted distillation arrangements with either the low or high pressure in the reflux drum are proposed to reduce and/or eliminate the application of the costly refrigerant for the separation of n-heptane and isobutanol mixture.The high-pressure arrangement with vapor recompression and heat integration is the most attractive among these four intensified configurations since it can reduce total annual cost by 18.10%,CO_(2) emissions by 75.01%based on natural gas(78.78%based on heavy oil fuel),and second-law efficiency by 61.20%compared to a conventional refrigerated distillation system.Furthermore,exergy destruction in each component is calculated for the heat integration configurations and is shown in pie diagrams.The results demonstrate that the high-pressure configuration presents unique advantages in terms of thermodynamic efficiency compared to the low-pressure case.In addition,dynamic control investigation is performed for the economically efficient arrangement and good product compositions are well controlled through a dual-point temperature control strategy with almost negligible product offsets and quick process responses when addressing 20%step changes in production rate and feed composition.Note that there are no composition measurement loops in our developed control schemes.

关 键 词：n-heptane/isobutanol vapor recompression heat integration low and/or high-pressure options 

分 类 号：TQ028.3[化学工程]