Equilibria of 1,1,2-Trichloro-1,2,2-trifluoroethane on Activated Carbons

Abstract

ChloroFluoroCarbons (CFCs) are now considered to be the prime contribution to stratospheric ozone depletion. As a result, the use of activated carbons to adsorb specific CFCs has received great attention. In this paper, the equilibrium adsorption characteristics of 1,1,2-trichloro-l,2,2trifluoroethane vapor on different-shaped carbons were studied. Adsorption isotherms of 1,1,2trichloro-l,2,2-trifluoroethane on an activated carbon pellet and an activated carbon felt were measured. The equilibria of 1,1,2-trichloro-l,2,2-trifluoroethane on the activated carbon pellet having a dual pore structure were expressed by the Redlich-Peterson equation, and equilibrium constants were expressed as functions of temperature from 298 to 393 K. On the other hand, the equilibria of 1,1,2-trichloro-l,2,2-trifluoroethane on the activated carbon felt having a relatively uniform pore structure were interpreted by the Dubinin-Radushkevich correlation based on the micropore volume filling theory. The affinity coefficient was correlated by the molar polarization.

Adsorption of Equal Mass Fraction Near an Azeotropic Mixture of Pentafluoroethane and 1,1,1-Trifluoroethane on Activated Carbon

“…3 Adsorption data for other ASHRAE designated refrigerants 11, 12, 13, 14, 22, 113, 115, 116, 123, 134a, 141b, and 318 are available in the literature. [4][5][6][7][8][9][10][11][12][13][14][15][16][17] There are some above atmospheric pressure studies for adsorption of R-12, R-22, and R-115 at pressures to 602 kPa 6 and for HFC 134a and pressures up to 1.3 MPa. 14,15 The data of Akkimaradi et al 14 were utilized by Akkimaradi et al 18 and Banker et al 19 for an analysis and to build a refrigeration system with Maxsorb II as the adsorbent and HFC 134a as the refrigerant.…”

“…A review of work on the recovery of the ethane and propane family HCFC recovery is provided by Tsai . Adsorption data for other ASHRAE designated refrigerants 11, 12, 13, 14, 22, 113, 115, 116, 123, 134a, 141b, and 318 are available in the literature. – There are some above atmospheric pressure studies for adsorption of R-12, R-22, and R-115 at pressures to 602 kPa and for HFC 134a and pressures up to 1.3 MPa. , …”

Adsorption Equilibria of CFC-115 on Activated Charcoal

“…4 Studies on the adsorption of CFCs have shown that activated carbons and zeolites are capable of adsorbing CFC gases. [5][6][7] It was also reported that activated carbon was used for recovering halogenated hydrocarbons. 8 We previously reported that the activated carbon pellet can be used as an adsorbent for recovering CFC-115.…”

“…Many researchers have proposed methods for the recovery of CFCs and the development of CFC replacements − It was also reported that activated carbon was used for recovering halogenated hydrocarbons . We previously reported that the activated carbon pellet can be used as an adsorbent for recovering CFC-115. − Because of porous structure, finely divided charcoal is a highly efficient agent for filtering the adsorption of gases and of solids from solution.…”

Adsorption Equilibria of Chloropentafluoroethane and Pentafluoroethane on Activated Carbon Pellet

“…Therefore, the Montreal Protocol was formulated to restrict the release of CFCs into the atmosphere (UNEP, 1987). This lead to research for ways to recover the halogenated hydrocarbons (Kodama et al, 1992;Kuo and Hines, 1992;Tsai and Chang, 1994) and the CFCs (Frere et al, 1994;Kobayashi et al, 1994;Cho and Lee, 1995).…”