Experimental Study of Vapor-Liquid Equilibrium and Optimization of Pressure-Swing Distillation for Methanol-Dimethyl Carbonate Binary System

Jaesuk Cho1, Yu Mi Kim2, Jaehyun Noh3, Dong Sun Kim1 and Jungho Cho1,*

1Department of Chemical Engineering, Kongju National University, Cheonan, Republic of Korea

2Process Solution Team, Kumho Petrochemical R&BD Center, Daejeon, Republic of Korea

3Department of Chemical Engineering, Hoseo University, Asan, Republic of Korea

*Corresponding author: Fax: +82 41 5542640; Tel: +82 41 5219366; E-mail: jhcho@kongju.ac.kr

Abstract

The mixture of methanol and dimethyl carbonate is characterized by an azeotropic point, thus, it is impossible to separate the azeotrope into respective high-purity products by general distillation. Herein, the separation of a methanol-dimethyl carbonate mixture via pressure-swing distillation was evaluated based on modeling and optimization of the separation process to obtain high-purity dimethyl carbonate. Currently, no experimental data on vapor-liquid equilibrium of methanol-dimethyl carbonate system is available in existing references. And even PRO/II, Aspen Plus, and ChemCAD simulation programs do not include a built-in binary interaction parameter of thermodynamic model of methanol-dimethyl carbonate system for accurate calculation. Therefore, the vapor-liquid equilibrium of the methanol-dimethyl carbonate binary system was experimentally evaluated under low-pressure and atmospheric pressure conditions and the binary interaction parameters were deduced from the non-random two-liquid model regression using the experimental data. The obtained binary interaction parameters were applied in modeling of the pressure-swing distillation process. Reboiler heat duty values from simulations under high-low pressure and low-high pressure configuration processes were compared and the process was optimized to minimize the heat duty.

Keywords

Dimethyl Carbonate, Vapor-liquid equilibrium, Pressure-swing distillation.

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