A new process using DWC(dividing wall column)instead of conventional double towers for light and heavy componets separation to address the high energy consumption in the production of 3-chloropropene.Aspen Plus software was used to simulate and optimize the traditional and improved processes of a 30 000 t/a propylene chloride plant.The effects of the number of trays,baffle length,baffle position,vapor phase distribution ratio,liquid phase distribution ratio,feed position and side line extraction position on thermal load and economic benefits were investigated.The results indicate that when the total theoretical number of plates is 52,with vertical partitions is located between 14 and 43 plates,the mass reflux ratio is 59,and the vapor phase distribution ratio and liquid phase distribution ratio(mass flow ratio)are 1.20 and 0.32,respectively.The feeding position is 22 theoretical plates,the side line extraction position is 33 theoretical plates,and the energy-saving effect of the dividing wall column achieves the best.Compared to traditional process,the condenser of the tower can save 47.9％energy,the reboiler can save 45.2％energy,and the total annual cost can be reduced by 37.9％.
维普
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