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

Abstract

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

Thermal coupled extractive distillation sequences with three entrainers for the separation of azeotrope isopropyl alcohol + diisopropyl ether

“…Currently, special distillations such as extractive distillation (ED), heterogeneous azeotropic distillation (HAD), pressure‐swing distillation (PSD) and reactive distillation (RD) are adopted to separate such azeotropes. Arifin et al .…”

“…Currently, special distillations such as extractive distillation (ED), 5-8 heterogeneous azeotropic distillation (HAD), [9][10][11][12][13] pressure-swing distillation (PSD) [14][15][16][17] and reactive distillation (RD) [18][19][20][21] are adopted to separate such azeotropes. Arifin et al 22 compared HAD and ED by total annual cost (TAC) to separate the azeotrope IPA + water, and results indicated that ED is more economic than HAD.…”