Increasing the yield of electrode coke by oxidation of the feedstock

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In the preoxidation of coker feedstock to obtain an electrode coke for use in aluminum production and for the processing of paraffinic feedstocks, the accelerated burnout of the heating surfaces is a major problem. A different version of feedstock preoxidation that gives adequate thermal stability of the feed is proposed by reversing the usual sequence of operations, distillation of the long resid followed by oxidation of the vacuum resid. The optimal parameters of this process are determined. A rather simple method is worked out for increasing the carbon residue of coker feed while maintaining adequate thermal stability.