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In the present study, simulation of a divided wall column (DWC) was carried  out to study the product quality and energy efficiency as a function of  reflux rate, liquid spilt and vapour split for the separation of C4-C6 normal  paraffin ternary mixture. Rigorous simulation of the DWC was carried out  using Multifrac model of ASPEN Plus software. Box-Behnken design (BBD) was  used for the optimization of parameters and to evaluate the effects and  interaction of the process parameters such as reflux rate (r), liquid split  (l) and vapour split (v). It was found that the number of simulation runs  reduced significantly for the optimization of DWC by BBD. Optimization by BBD  under response surface methodology (RSM) vividly underscores interactions  between variables and their effects. The predictions agree well with the  results of the rigorous simulation

Optimization of a divided wall column for the separation of C4-C6 normal paraffin mixture using Box-Behnken design