5 years ago

Design and Control of a Heat Pump-Assisted Azeotropic Dividing Wall Column for EDA/Water Separation

Design and Control of a Heat Pump-Assisted Azeotropic Dividing Wall Column for EDA/Water Separation
Mengqi Chen, Jianxin Wang, Lanyi Sun, Minyan Zhu, Lin Cong, Na Yu
A novel heat pump-assisted azeotropic dividing wall column (HP-ADWC) has been proposed for the separation of a maximum-boiling ethylenediamine (EDA)/water system in this paper. Compared with conventional azeotropic distillation (CAD), HP-ADWC allows 42.93% energy savings and 24.36% total annual cost (TAC) savings if the payback period is assumed to be 8 years. To achieve the energy and economic benefits, this novel design must be controllable. However, it is challenging to control this complex and highly integrated HP-ADWC process since there are more interactive variables and fewer degrees of freedom than classic DWC process. In this paper, the dynamic controllability of HP-ADWC is studied by Aspen Dynamics and an effective control structure named CS4 is proposed, which works pretty well for the disturbances in both feed rate and feed composition.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02466

DOI: 10.1021/acs.iecr.7b02466

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