Study On Strengthening And Coupling New Process Of C4 Distillation Separation Process

At present,the comprehensive utilization rate of C4 distillates is low.To improve the comprehensive utilization rate of C4 distillates,it is necessary to separate and purify the components of C4 distillates,so that each component can play a maximum role.At present,extractive distillation is mainly used to separate paraffin and olefin from c4 distillates at home and abroad,which has the disadvantages of long process,high energy consumption,and large investment.Extractive distillation separation based on the existing carbon four fractions process as the research object,by means of chemical process simulation software Aspen plus,confirm the activity coefficient model by simulating calculation of UNIFAC thermodynamic equation as physical property calculation method,and then by investigating agent hydrocarbon ratio,reflux ratio,proportion of extraction agent,the change of process parameters such as four feed carbon olefins ratio,through the optimization,it is concluded that the simulation data,makes the butane purity of the product increased by 1.14%,butene increased by 1.50% and product purity has a certain degree of increase;However,the total heat load of the device decreased by 3.48%.The reduction of energy consumption is not ideal.Therefore,a new process of using clapboard column to replace the original extractive distillation column was proposed.Similarly,Aspen plus,a chemical simulation software,was used to simulate the separation of c-4 fractions in the separation column,and the positions of the upper and lower ends of the clapboard were investigated.Vapor liquid distribution ratio;C4 feeding position;Structural parameters such as the change of the number of theoretical tray number of carbon four fractions separation effect and the impact of energy consumption,and comparing the simulation results of two kinds of new and old technology,found clapboard extraction rectification tower has a higher thermodynamic efficiency and less backmixing,device can make the total energy consumption is reduced,heat load can be reduced by 27%,the cooling load can be reduced by 25.16%.