Study on Adsorption Properties and Breakthrough Model of 1,1-Dichloro-1-Fluorothane on Various Micropore Adsorbents

• Main Authors: Ho, Chin-Yin, 賀志殷
• Other Authors: Chang Chun-Yan, Tsai Wun-Tain
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/94448381744805296044

碩士 === 國立臺灣大學 === 環境工程學研究所 === 85 === The adsorptions of 1,1-dichloro-1-fluoroethane (HCFC-141b) on three different adsorbents, i.e., granular activated carbon, activated carbon fiber and hydrophobic zeolite, respectively, were performed. Some major physicaland chemical properties of the adsorbents used in this study, and adsorption capacities and breakthrough curves for the adsorption of HCFC-141b at various temperatures and concentrations were determined. The expermental results werecorrelated and simulated with the common adsorption equation and Yoons'''' breakthrough model. The experimental results indicate that the adsorption capacityis highly related to the micropore area and volume of the adsorbents. Evidently, the adsorption capacities for the adsorption of HCFC-141b on the hydrophobic zeolite and the activated carbon fiber are also affected with the surface polarity and the structure of pore.It was found that the measured adsorption datacan be reasonably well fitted by the Langmuir, Freundlich and Dubinin-Raduskevich equations.The values of the parameters of the adsorption isotherms and thethermodynamic properties of the adsorption were thus obtained for the corresponding adsorbents, which are consistent with the physical properties of the adsorbents. The hydrophobic zeolite is significantly unfavorable to the adsorption of HCFC-141b as indicated by the values of the parameters of Freundlichisotherms. Based on the breakthrough model of Yoon and Nelson (1992) and resultsof simulation, it is seen that the relationship between the pore structure andthe adsorption diffusion rate of the adsorbents can be explained by the magnitudes of the adsorption constants of the model. Further, it is reasonable toexpress the relationship between the adsorption constant and the adsorptiontemperature according to Arrhenius rate equation.