ABSORPTION OF VOLATILE ORGANIC-COMPOUNDS - AN ALTERNATIVE CRITERION FOR CHOOSING WASHING LIQUIDS FOR THE ABSORPTION OF VOC

The activity coefficients of some volatile organic compounds in differ ent absorption media were determined by head space gaschromatography a t two temperatures. The experimental results show that within the erro r of limit the respective activity coefficient obtained at mole fracti on x = 0,005 of VOC in the liquid phase is found to be equal to the ac tivity coefficient at infinite dilution. It can be concluded that the molecular structure of a washing liquid is responsible for its absorpt ion behaviour. The excess free energy of mixing fractions of absorptio n medium and volatile organic compound was found as an alternative cri terion for the selection of washing liquids. The data are in coinciden ce to activity coefficients resulting from thermodynamic investigation s.