Abstract
A sulfur-containing residual oil has been cracked in a fluidized bed of an iron-containing catalyst with hydrogen generation of 180Nl-H2/kg-feed oil by reaction of ferrous oxide with steam and of 30Nl-H2/kg-feed oil by dehydrogenation of the feed oil. The iron sulfide formed in the catalyst during partial oxidation of coke has been desulfurized by roasting with air in a fluidized bed roaster. The desulfurization reaction has been found to be fast enough to attain equilibrium during roasting. Based on these results, a new cracking process has been proposed. It consists of cracking sulfur-containing residual oil, generation of hydrogen, partial oxidation of coke on the catalyst, fixation of gaseous sulfur compounds in the catalyst, and roasting of the iron sulfide.
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