活性炭处理甲苯气体吸附再生实验研究

Adsorption breakthrough experiments for removing toluene from gaseous influent and hot air regeneration of the spent activated carbon

研究了活性炭对甲苯废气的吸附穿透过程及热空气解吸过程。穿透曲线实验结果表明，在常规空塔气速范围内，传质区高度基本在5．06～9．75cm，传质区不饱和度在0．4～0．7。在动态运行情况下，活性炭对甲苯的饱和吸附容量在0．16～0．24g／g。热空气吹脱实验表明，适宜的脱附工况条件为脱附温度180℃、脱附空气流速0．106m／s、脱附时间40min。

Series of adsorption breakthrough experiments for removing toluene from gaseous influent were conducted to determine the effects of important operating parameters on the depth of the mass transfer zone（ MTZ） and its degree of under saturation. For the experimental runs（superficial velocity = 0, 38-0.66 m/s,influent concentration= 1 800-5 030 mg/ma ,temperature= 30.5-32.6 ℃, relative humidity= 51. 6%-83, 7%）, the calculated depth of MTZ was 5, 06-9.75 cm and its degree of under saturation was 0.4-0.7, Extensive regeneration runs were performed on the spent activated carbon samples（with 0.16-0.24 g/g of toluene） by contacting the carbon with a stream of hot air for a period of time. The spent activated carbon samples were effectively regenerated（desorption rate 〉85%） by hot air （180 ℃ ,superficial velocity=0. 106 m/s） in 40 min.