HENRYS LAW GAS-SOLID CHROMATOGRAPHY AND CORRELATIONS OF VIRIAL-COEFFICIENTS FOR HYDROCARBONS, CHLOROFLUOROCARBONS, ETHERS, AND SULFUR-HEXAFLUORIDE ADSORBED ONTO CARBON

Gas-solid chromatography was used to determine the Henry's law second gas-solid virial coefficients within the temperature range of 314-615 K for ethane, propane, butane, isobutane, pentane, hexane, heptane, ch loromethane, dichloromethane, trichloromethane, tetrachloromethane, tr ichlorofluoromethane (Freon 11), chlorodifluoromethane (Freon 22), dic hlorodifluoromethane (Freon 12),methyl ether, ethyl ether, and sulfur hexafluoride with Carbopack B, a microporous carbon adsorbent. The tem perature dependence of the second gas-solid virial coefficients of the se adsorbates was used in conjunction with analyses based on a graphic al method, a single-surface numeric integration method, a single-surfa ce analytic expression method, and a two-surface analytic expression m ethod to determine the gas-solid interaction energies and other parame ters. The interaction energies were correlated with a ratio of the cri tical temperature divided by the square root of the critical pressure. The four methods were compared in their abilities to successfully cal culate second gas-solid virial coefficient values. (C) 1995 Academic P ress, Inc.