Adsorption purification of HCN in closed carbide furnace tail gas by modified activated carbon

For comprehensive utilization of CO contained in closed carbide furnace tail gas, the purification of HCN in the artificial tail gas mixed with pure gases was studied by means of adsorption using modified activated carbon. In range of this study the optimum conditions for preparing modified activated carbon are: NaOH concentration is 10 wt% and sulfonated cobalt phthalocyanine (CoPcS) concentration is 166.7 mg/L for activated carbon impregnation; its dryness temperature is 100°C. Scanning electron microscopy (SEM) and Raman spectroscopy analyses indicate that HCN reacts on the surface of the modified activated carbon. The equilibrium adsorption capacity increases, however the structure of CoPcS has not been changed.