COADSORPTION OF ORGANIC-COMPOUNDS AND WATER-VAPOR ON BPL ACTIVATED CARBON .2. 1,1,2-TRICHLORO-1,2,2-TRIFLUOROETHANE AND DICHLOROMETHANE

A novel volumetric apparatus is used to measure equilibria for mixed vapors of halocarbons and water coadsorbed on BPL activated carbon. Pure-component 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) and dichloromethane (methylene chloride) isotherms are obtained at 0, 25, 50, 75, and 100-degrees-C over wide ranges of pressure. A separate isotherm measured for CFC-113 at 50-degrees-C indicates the presence of pure component hysteresis in the mesopore structure of the activated carbon at high halocarbon loadings. Mixture equilibria are measured for CFC-113/water systems at 25 and 100-degrees-C and for dichloromethane/water systems at 25-degrees-C. All components exhibit hysteresis, and the halocarbon partial pressure increases as the water loading is increased at constant halocarbon loading. Results for halocarbon/water mixtures together with previous results for hydrocarbon/water mixtures show that the apparent total pore volume filled near saturation is dependent on the adsorption temperature and the solubility of the organic compound in water.