Korean Journal of Chemical Engineering

The Korean Institute of Chemical Engineers (한국화학공학회)
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Design and control of extractive distillation for the separation of methyl acetate-methanol-water

  • Wang, Honghai (National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization of Hebei University of Technology) ;
  • Ji, Pengyu (National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization of Hebei University of Technology) ;
  • Cao, Huibin (National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization of Hebei University of Technology) ;
  • Su, Weiyi (National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization of Hebei University of Technology) ;
  • Li, Chunli (National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization of Hebei University of Technology)
  • Received : 2018.06.05
  • Accepted : 2018.09.03
  • Published : 2018.12.01
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Abstract

The azeotrope of methyl acetate methanol and water was isolated using extractive distillation with water as entrainer. The pressure-swing extractive distillation (PSED) process and vapor side-stream distillation column (VSDC) with the rectifier process were designed to separate the methyl acetate, methanol and water mixture. It was revealed that the VSDC with the rectifier process had a reduction in energy consumption than the PSED process. Four control schemes of the two process were investigated: Double temperature control scheme (CS1), $Q_R/F$ feedforward control of reboiler duty scheme for PESD (CS2), $Q_R/F$ feedback control scheme for VSDC (CS3), the feedback control scheme of sensitive plate temperature of side-drawing distillation column to dominate the compressor shaft speed (CS4). Feed flow and composition disturbance were used to evaluate the dynamic performance. As a result, CS4 is a preferable choice for separation of methyl acetate-methanol-water mixture. A control scheme combining the operating parameters of dynamic equipment with the control indicators of static equipment was proposed in this paper. It means using the sensitive plate temperature of side-drawing column to control the compressor shaft speed. This is a new control scheme for extractive distillation.

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