Abstract
Side-stream extractive distillation typically requires the introduction of expensive high-pressure steam, which is not conducive to economic benefits. A heuristic approach is to introduce an intermediate reboiler in side-stream extractive distillation to reduce the use of high-pressure steam and thus lower economic costs. In this article, three side-stream extractive distillation with intermediate reboiler processes are proposed to recover the benzene and isopropanol from chloramphenicol production effluent. Taking into account economic, environmental, and entropy production indicators, an evolutional genetic algorithm is used to conduct the multi-objective optimization for the three processes. After obtaining the optimal operation parameters, the corresponding heat integration processes are proposed. Following that, the six process are compared to the optimal double side-stream extractive distillation process (D-SSED) in literature. It indicates that all six processes have good economic potential, especially the single side-stream extractive distillation with intermediate reboiler process with heat integration (S-SSEDIR-2-HI), which is the optimal scheme. Compared to the D-SSED process, it can reduce total annual cost (TAC) by 29.02 %, CO2 emission by 36.14 %, and entropy production by 44.07 %.
Published Version
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