Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Optimization Study for Pressure Swing Distillation Process for the Mixture of Isobutyl-Acetate and Isobutyl-Alcohol System

Isobutyl-Acetate와 Isobutyl-Alcohol 이성분계의 압력변환증류 공정 최적화 연구

  • Cho, Sung Jin (Department of Chemical & Biochemical Engineering, Dongguk University) ;
  • Shin, Jae Sun (Department of Chemical & Biochemical Engineering, Dongguk University) ;
  • Choi, Suk Hoon (Department of Chemical & Biochemical Engineering, Dongguk University) ;
  • Lee, Euy Soo (Department of Chemical & Biochemical Engineering, Dongguk University) ;
  • Park, Sang Jin (Department of Chemical & Biochemical Engineering, Dongguk University)
  • 조성진 (동국대학교 화공생물공학과) ;
  • 신재선 (동국대학교 화공생물공학과) ;
  • 최석훈 (동국대학교 화공생물공학과) ;
  • 이의수 (동국대학교 화공생물공학과) ;
  • 박상진 (동국대학교 화공생물공학과)
  • Received : 2013.12.26
  • Accepted : 2014.01.24
  • Published : 2014.06.01
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Abstract

In this study, an optimization process design has been performed to separate 99.9 mol% of Isobutyl Acetate from binary azeotropic mixture of Isobutyl Acetate and Isobutyl Alcohol system using a Pressure Swing Distillation (PSD). PSD is used to separate binary azeotropic mixtures using the difference between the relative volatilities and azeotropic compositions by changing the system pressure. Non-Random Two Liquid (NRTL) model for liquid phase and the Peng-Robinson equation for vapor phase are used. An optimization study for the reflux ratio and feed stage locations which minimize the total reboiler heat duties are studied. Since PSD process consists of two columns, i.e. high pressure and low pressure, the effect of column sequence on the optimum conditions is reported.

본 연구에서는 Isobutyl Acetate와 Isobutyl Alcohol의 공비혼합물을 압력변환증류공정(PSD; Pressure Swing Distillation Process)을 이용하여 99.9 mol% 이상의 Isobutyl Acetate를 분리하는 공정모사를 수행하였다. 압력변환증류공정은 공비혼합물의 상대휘발도와 공비조성이 압력의 변화에 따라 차이가 나는 특성을 이용한 공정이다. 액상에서는 Non-Random Two Liquid (NRTL) model을 그리고 기상에서는 Peng-Robinson equation을 이용하였다. 최적화 방법으로 환류비와 주입단 위치를 변수로 두고 총 재비기 소요 열량을 최소화시키는 목적으로 최적화를 수행하였다. 압력변환 증류공정은 두 개의 증류탑을 필요로 함에 따라 고압 증류탑과 저압 증류탑의 배열에 따른 최적화 조건 또한 비교를 수행하였다.

Keywords

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