Abstract
Abstract A study on the separation of alkanes and aromatics with supercritical ethane, carbon dioxide, monochlorotrifluoromethane, and trifluoromethane is presented. It appears that only with solvents that have a low dipole moment, such as ethane and carbon dioxide, can reasonable solubilities in the vapor phase be obtained. These low dipole moment solvents will separate alkanes and aromatics mainly on the basis of their difference in vapor pressure rather than on their difference in chemical structure. Therefore, supercritical solvents can only be used for specific applications where alkanes and aromatics have to be separated on the basis of their difference in vapor pressure.
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