pervaporation;  gasoline desulfurization;  Bottom film;  mass transfer;  Composite film

Polyvinylidene fluoride was used as the base film material and hydroxyethylcellulose (HEC) was used as the active layer material, and the mass concentration of wattle was added to the bottom film casting solution. Different HEC composite membranes for pervaporation desulfurization were prepared; The desulfurization performance of the composite membrane was evaluated by catalytic cracking gasoline, and the mass transfer of gasoline components in the bottom film was simply analyzed. The results show that . The mass concentration of the additive increased, the average pore size of the bottom film increased, but the porosity decreased slightly, but the mass transfer coefficient of the gasoline component in the bottom film increased. The concentration of additives increased, and the selectivity of HEC composite membrane for sulfides first increased and then decreased. The permeability decreases first and then increases, and an extreme value occurs when the amount of wattle is added by 1%.