OFF-GAS PURIFICATION BY MEANS OF MEMBRANE VAPOR SEPARATION SYSTEMS

The separation and recovery of volatile hydrocarbon vapors from gasoli ne tank farm off-gases can in Europe be considered to be a state-of-th e-art technology (1). A new application in the treatment of gasoline v apors is the installation of a membrane module in vapor return lines f rom petrol dispensers to storage tanks at gasoline stations to enhance the vapor recovery efficiency of this system. For solvent vapor recov ery, some membrane systems have been installed in the chemical and pha rmaceutical industry (2). This paper deals with design features and op erating experience.