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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.

Residual oil cracking with generation of hydrogen (Part 4). Proposal for a new cracking process with desulfurization of iron sulfide by roasting.