Thermally Coupled Distillation Of Divided Wall Column Research

Distillation,which has high energy consumption and needs costly equipment,is.widely used unit operation in chemical industry.In the industry of crude oil refine,chemical engineering and natural gas processing,its energy consumption is more than half of total process energy consumption.So the research about saving energy on distillation process is significant.Thermally coupled distillation is a kind of complex column process which consists of main column and accessory column.It has much less irreversible energy loss and higher Thermodynamic Efficiency in distillation process.Divided Wall Column is kind of special column structure of Thermally coupled distillation,which has less energy consumption and less cost in equipment.The research is about separating ternary mixtures,stimulating and analyzing process of three kings of Divided Wall Column and normal Distillation with Aspen Plus software,and researching on how different feed compositions and Ease of Separation Index(ESI) influence energy consumption of every column sequences.Simulating the mixture of benzene and toluene and dimethyl benzene from Catalytic Reforming and taking off pentane,the result showed that the feed position,reflux ratio,side -draw position and flow distribution ratio had influence in separation result.Comparing the Divided Wall Column distillation,the traditional side-draw and the traditional distillation sequence,it showed that the Divided Wall Column distillation was excellent in the separation efficiency and the energy consumption,and analyzed why it consumed less energy.