Importance

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Abstract

A delayed coking process and a solvent deasphalting process are combined so that an asphalt mix of asphalt and solvent from the solvent deasphalting process is sent as feedstock to the delayed coking process to form coke and intermediate hydrocarbon vapor and liquid products. The vaporization of the solvent in a delayed coker heater assists the flow of the asphalt mix through the heater, and a portion of the asphalt mix is directed to a delayed coking fractionator so that the flow of solvent through the delayed coking heater can be adjusted by varying the relative amounts of asphalt mix sent to the delayed coker heater and to the fractionator. A deasphalted oil mix of deasphalted oil and solvent from the solvent deasphalting process is heated by hotter fluid products from a fractionator in the delayed coking process, and makeup solvent to a solvent deasphalting section is heated by vapors in the fractionator overhead. The solvent is recovered from the deasphalted oil mix to yield deasphalted oil, which is stripped in the same vessel as products from the fractionator of the delayed coking process. Condensation of the vapors from the fractionator overhead produces sufficient lean oil that a separate lean oil still may not be required for the economic recovery of coker liquefied petroleum gases. Solvent may be recoverd from the lean oil and naphtha products to supplement the makeup solvent.

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First Claim