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Petroleum treating process involving solvent deasphalting and propane fractionation

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1. A PETROLEUM TREATING OPERATION WHICH COMPRISES SOLVENT DEASPHALTING A PETROLEUM RESIDUUM EMPLOYING A LIQUEFIED C4 HYDROCARBON AS THE DEASPHALTING SOLVENT, SUBJECTING THE RESULTING DEASPHALTED PETROLEUM RESIDUUM TO A FIRST PROPANE FRACTIONATION OPERATION TO SEPARATE THEREFROM A FIRST OIL FRACTION AND A FIRST BOTTOMS FRACTION, SUBJECTING SAID FIRST BOTTOMS FRACTION TO A SECOND PROPANE FRACTIONATION OPERATION TO SEPARATE THEREFROM A SECOND OIL FRACTION AND A SECOND BOTTOMS FRACTION, SAID FIRST PROPANE FRACTIONATION OPERATION BEING CARRIED OUT UNDER CONDITIONS MORE SEVERE THAN SAID SECOND PROPANE FRACTIONATION OPERATION INCLUDING A TEMPERATURE WITHIN THE RANGE OF 5 TO 60* F. ABOVE SAID SECOND PROPANE FRACTIONATION OPERATION, AND PASSING SAID SECOND BOTTOM FRACTION TO THE SOLVENT DEASPHALTING OPERATION.
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