Sandwich Desulfurization
Sandwich Desulfurization :
A hydrotreating process for removing sulfur compounds from petroleum streams. The sulfur compounds are first hydrogenated and then absorbed in a train of three catalyst beds-the "sandwich." In the first bed, zinc oxide absorbs hydrogen sulfide and reactive sulfur compounds; in the second, cobalt molybdate on alumina hydrogenates non-reactive thiophenes, forming hydrogen sulfide; in the third, zinc oxide absorbs the hydrogen sulfide from the second bed
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