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Hybrid reactive distillation using polyoctylmethylsiloxane membrane for isopentyl acetate production from mixed PVA by products

Wang, Chen, Wang, Chao, Guang, Chao, Gao, Jun, Zhang, Zhishan
Journal of chemical technology and biotechnology 2019 v.94 no.2 pp. 527-537
acetates, byproducts, carbon dioxide, chemical equilibrium, distillation, energy conservation, energy efficiency, feedstocks, greenhouse gas emissions, ionic liquids, isoamyl alcohol, pervaporation, polyvinyl alcohol, transesterification
BACKGROUND: The transesterification of methyl acetate and isoamyl alcohol catalyzed by ionic liquids is a new environment‐friendly method for isopentyl acetate (iso‐AmAc) production, and also appropriate for the recovery of polyvinyl alcohol (PVA) byproducts. Therefore, it is of great significance for iso‐AmAc production from PVA byproducts to explore alternative processes with the goal of improving the conversion of the chemical equilibrium reaction and energy efficiency, including reactive distillation (RD), dividing‐wall reactive distillation (RDWC) and pervaporation (PV)‐based hybrid reactive distillation. RESULT: This article proposed four novel reactive hybrid processes with feedstock of mixed PVA byproducts and made a comparison with two conventional processes of RD and RDWC in terms of the minimum total annual cost (TAC) and CO₂ emissions. The results revealed that the RDWC‐PV can give a 35.61% saving in TAC and a 40.27% reduction in CO₂ emissions compared with the RD, and the other three RD‐PV hybrid processes have less CO₂ emissions and equivalent TAC compared with the RDWC. CONCLUSION: In summary, all hybrid processes proposed were more energy‐saving and economical than the conventional RD, especially the RDWC‐PV, due to synergistic advantages of various process intensification methods. © 2018 Society of Chemical Industry