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Process for upgrading residuums by combined donor visbreaking and coking

  • US 4,604,186 A
  • Filed: 11/06/1985
  • Issued: 08/05/1986
  • Est. Priority Date: 06/05/1984
  • Status: Expired due to Term
First Claim
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1. A process for upgrading petroleum residuums to more valuable products comprising the steps ofmixing a hydrogenated aromatic donor fraction with the petroleum residuums to form a vis breaker feed;

  • donor visbreaking the visbreaker feed in a thermal visbreaker to crank heavy hydrocarbons into lighter products wherein the hydrogenated fraction in the visbreaker feed reacts to donate hydrogen to prevent formation of coke and reduce the quantity of coke precursors;

    coking a coker feed including substantially all of the high boiling portion and substantially all of the aromatic donor fraction of the effluent from the visbreaker in a coker under nonpremium coker conditions to produce coke and overhead products whereby the reduction of coke precursors by the donor visbreaking reduces the quantity of coke product and increases the quantity of overhead productd;

    fractionating the overhead products from the coker in a fractionater to produce one or more light product fractions, and an aromatic donor recycle fraction; and

    hydrogenating the aromatic donor recycle fraction from the fractionator to form the hydrogenated donor formation for the visbreaker feed.

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