Effect of solvation with salting effect on solubilities of fluorocarbons in alcohols

Abstract

In our previous work, we found that salting-out effect of a fluorocarbon in an alcohol–NaOH solution brought solubility decrease which could be expressed in terms of the Setchenov coefficient. In this work, a group contribution method for the Setchenov coefficients was made, for dichrodifluoromethane (CFC-12), penafluoroethane (HFC-125), difluoromethane (HFC-32), 1,1,1,2-tetarfluoroethane (HFC-134a) and 1,1-difluoroethane (HFC-152a) in methanol–NaOH and ethanol–NaOH solvents. Moreover, as a simple model, we derived the relationship between the Setchenov coefficients and solvation number of alcohols around a NaOH molecule. Therefore, once information of the Setchenov coefficients was obtained, the solvation numbers could be predicted based on the model. Prediction of the Setchenov coefficients for VOC solublities in water–salt system is possible with the new method.