Industrial & Engineering Chemistry Research, Vol.57, No.36, 12127-12135, 2018
A Novel Divided-Wall Heat Integrated Distillation Column: Thermodynamic and Economic Feasibility
This work introduces a new divided-wall thermally integrated column that aims to enhance the thermodynamic reversibility of distillation operation. Dividing the cylindrical shell into two equal semicylinders by a vertical wall, they are proposed to operate under a diabatic condition under the framework of traditional heat integrated distillation column (HIDiC) scheme. This leads to transfer of the heat from the high- to low-pressure side through that wall, thereby reducing the utility consumption. In this way, this novel divided wall HIDiC configuration attempts to utilize the internal energy source and thus improves its thermodynamic efficiency and economic performance. Simulating a binary wide-boiling system, it is observed that the proposed scheme secures a 42.30% savings in energy consumption with a payback period of 3.45 yr. Although the traditional HIDiC shows a better performance in terms of energy savings (50.80%) and payback time (3.31 yr), the proposed HIDiC is more practically relevant from the design and operational perspective.