Abstract
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, 5wt.%Ag2O/NaY showed the highest breakthrough sulfur capacity. The adsorption selectivity of Ag2O/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 Ag2O/NaY for removing disulfide from solutions containing olefin. Regeneration study indicated that the saturated adsorbent was regenerated under the temperature of 550°C for 8h in the air atmosphere. After five times regeneration, the adsorbent Ag2O/NaY still shows high breakthrough sulfur capacity.
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