(547g) Design of Extractive Distillation Processes Using Simulated Annealing and a Rigorous Process Simulator
In this work, continuous extractive distillation processes were optimized using simulated annealing (SA) and simulation in a rigorous process simulator (Aspen Plus). Connection between the two programs was achieved by means of a client-server architecture, with Matlab as the automation client and Aspen Plus as the automation server. Three separation problems were considered: separation of acetone and methanol, separation of hexane and ethyl acetate and the separation of n-hexane and tetrahydrofuran. For the separation of acetone and methanol, previous results for the process design are available in the literature for comparison. For the latter two separations, to our knowledge there are no reports of continuous process designs for the separation in the open literature. For each separation, several different candidate entrainers were considered and the costs were compared.
For the separation of acetone and methanol, the TAC of the process for each entrainer considered was lower than the initial condition taken from the literature. For the separation of n-hexane and ethyl acetate, NMP, 2-methylpyridine, 3-methylpyridine, DMF, and pyrrole were considered as possible entrainers. The results show that DMF offers the best performance and economic benefit. For the separation of n-hexane and tetrahydrofuran, the candidate entrainers were DMF, NMP, and 2-methylpyridine. DMF was again found to be the most suitable entrainer. The results show that the SA algorithm has the advantage of running automatically and has a high probability to obtain a design near the global optimum.
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