Adsorptive separation of dimethyl disulfide from liquefied petroleum gas by different zeolites and selectivity study via FT-IR

The removal of dimethyl disulfide from model liquefied petroleum gas using metal salt impregnated zeolite as the adsorbent was studied in a fixed-bed adsorption equipment. Effects of different carrier, metal iron species and content of active component, mass space velocity, temperature, as well as adsorption selectivity and regeneration performance were all investigated by performing the breakthrough experiment. Among all these adsorbents, 5   wt.%Ag 2 O/NaY showed the highest breakthrough sulfur capacity. The adsorption selectivity of Ag 2 O/NaY was studied by the infrared spectra. It was found that the direct S–Ag(I) interaction was the essential reason for the evidently improved adsorption ability and selectivity of Ag 2 O/NaY for removing disulfide from solutions containing olefin . Regeneration study indicated that the saturated adsorbent was regenerated under the temperature of 550   °C for 8   h in the air atmosphere. After five times regeneration, the adsorbent Ag 2 O/NaY still shows high breakthrough sulfur capacity.