Studies on Removal of CO_CO_2 From Methanol Dissociated Gas by Pressure Swing Adsorption
LIU Jishun;HE Fen;LI Kebin;School of Materials and Chemical Engineering,Sichuan University of Science & Engineering;
The twin towers adsorption test was carried out by using activated carbon and 5A molecular sieve as adsorbents,and the removal of CO_CO2from methanol dissociated gas by pressure swing adsorption was studied. The adsorption isotherms and breakthrough curves of CO and CO2 on activated carbon and 5A molecular sieve were investigated at 293 K,meanwhile,the influence of composite bed packing ratio and regeneration method on adsorption performance was also discussed. The results showed that the chose activated carbon and 5A molecular sieve had high static adsorption capacity and dynamic adsorption capacity to CO and CO2,moreover,a much higher adsorption and desorption efficiency of CO and CO2 from dissociated methanol gas was achieved when CO2 was adsorbed by activated carbon and CO was adsorbed by 5A molecular sieve,separately. The highest adsorption capacity and bed use ratio were obtained when the packing ratio of composite bed activated carbon /5A molecular sieve was about 40 /20. The regeneration effect of H2 countercurrent purge was better than vacuum desorption,and the removal efficiency of impurity was higher and the consumption of H2 was reasonable when the purge gas at 2. 92 L / min. In the process of pressure swing adsorption,the co-current gas was used to purge,which effectively decreased the consumption of H2.