Experiment and process simulation for the removal of low concentration vinyl chloride by ionic liquids
The feasibility of deep vinyl chloride removal from tail gas was investigated by proposing the efficient absorption of vinyl chloride using ionic liquids(ILs).The saturation absorption of three types of ILs(i.e.,[BMPYR][Tf2N],[BMIM][Tf2N]and[EMIM][Tf2N])on simulated vinyl chloride gas with a low concentration(5％)was measured using the equal volume saturation method,followed by an absorption experiment in a packed tower with simulated vinyl chloride gas at an extremely low concentration(0.01％).Subsequently,the concept design and process optimization of vinyl chloride absorption by ILs was performed using Aspen Plus process simulation software.The results indicate that the Henry constant of vinyl chloride is significantly lower than that of nitrogen,and the influence of temperature was relatively small.The experimental results of the absorption tower demonstrate that all the three ILs exhibited excellent removal performance(absorption ratio＞94％)of vinyl chloride simulation gas with extremely low concentration(0.01％)under conditions of 25℃,atmospheric pressure,and inlet flow rate of 100mL/min.Among them,[BMPYR][Tf2N]exhibited the highest absorption ratio at 97％.Process optimization results for[BMPYR][Tf2N]absorbing vinyl chloride tail gas(1％,inlet flow rate of 100kg/h)reveal that under optimal operating conditions:number of theoretical plates for absorption tower of 6,a relative operating pressure of 0.25MPa,an IL absorption mass flow rate of 2600kg/h,as well as a temperature of 160 ℃ and a pressure of 0.001 bar for the secondary flash tank,the emitted concentration of vinyl chloride can meet the specified standard(0.0015％).The findings demonstrate that the utilization of ILs for efficient removal of vinyl chloride from exhaust gas and their extensive application can significantly contribute to mitigating the pollution caused by toxic and hazardous substances.
万方数据
维普
