抄録
The static and dynamic adsorption characteristics of hydrogen sulfide on activated carbons and zeolites were investigated to obtain some fundamental information on the removal of hydrogen sulfide in the gaseous phase. The amount adsorbed and the rate of adsorption were measured by the static method, and the service time was measured by the dynamic method. The adsorption of hydrogen sulfide on adsorbents was expressed by Freundlich's equation at equilibrium concentrations up to 70, 000ppm. Among the 24 kinds of adsorbents, the amount adsorbed on activated carbons No.4 and No.8, and zeolites No.16 and No.17 was 36.50, 35.42, 69.23, and 87.55ml/g at 70, 000ppm, respectively, and their adsorption attained equilibrium within about ten minutes. It may be concluded that the amount adsorbed on adsorbents was mainly affected by their pore volume in the range of pore radii from 2.2 to 6.5Å rather than by their chemical properties such as pH, pKa, basic amount, and acid amount. The heats of adsorption of Nos. 4, 8, 16, and 17 were less than 18kcal/mol. The amount chemisorbed on the activated carbons and the zeolites was about ten and two %, respectively and, therefore, these adsorbents used seemed to be regenerated by some simple treatment to the extent of the original adsorption capacity. Among the 8 kinds of adsorbents, the service time of No.8 and No.17 (9∼20 mesh) with a concentration of hydrogen sulfide 7, 000ppm at a flow rate of the mixed gas (H2S-air) 650ml/cm2⋅min was 23 and 65 minutes, respectively, and no correlation was established between the amount adsorbed and the service time. A linear relationship existed between the service time and the length of column, and the service time was inversely proportional to the flow rate of the mixed gas and the concentration of hydrogen sulfide.
