Pervaporation of dichloromethane from multicomponent aqueous systems containing n-butanol and sodium chloride

Partial fluxes were promoted with temperature in all the systems studied. The activation energy values for the permeation of volatile organic compounds (VOCs) in all the systems studied were higher than that of water. The PV of ternary DCM/n-butanol/water mixtures indicated that there was no coupling effect between the VOCs. The membrane presented higher fluxes of water than of VOCs. Further, the membrane exhibited about three times higher permeation flux and enrichment factor towards n-butanol than to DCM at equal VOCs concentration. The addition of electrolyte did not influence the membrane performance, neither the Arrhenius behaviour and no salting phenomena were observed. The calculated overall permeances indicate a faster transport of water through the membrane than of VOCs. Further, the permeance towards the transport of n-butanol was smaller than of DCM.