Pervaporation (PV) has recently gained much attention as an alternative separation process for azeotropic, close-boiling and thermally unstable mixtures. Moreover, PV is an energy-saving and easy scale-up process. Nowadays research in pervaporation is focused on finding new membrane materials with higher transport characteristic. Membranes based on polyamides are promising due to their high mechanical, thermal and chemical stability with appropriate separating properties. The aim of the present work is an investigation of physico-chemical and transport characteristics of aromatic polyamide (PA) and complex polymer-metal PA-Cu(I) in the process of fuel desulphurization by pervaporation. Thiophene along with other sulfur-containing compounds causes environmental pollution due to sulfur dioxide emissions from fuel combustion. Thus, the reduction of sulfur level in fuels is a relevant problem in the petrochemical industry. In this paper, n-heptane was chosen to simulate gasoline, with thiophene as the representative sulfur impurity.