Catalytic cracking with deasphalted oil
First Claim
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1. A catalytic cracking process, comprising the steps of:
- hydrotreating resid;
thereafter deasphalting said hydrotreated resid to produce substantially deasphalted oil;
catalytically cracking said hydrotreated oil in a catalytic cracking unit in the presence of a cracking catalyst to produce upgraded oil leaving coked catalyst; and
regenerating said coked catalyst in the presence of a combustion-supporting gas comprising excess molecular oxygen in an amount greater than the stoichiometric amount required for substantially completely combusting the coke on said catalyst to carbon dioxide.
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Abstract
A process is provided in which solvent-extracted oil or other deasphalted oil derived from hydrotreated resid is catalytically cracked to increase the yield of gasoline and other high value products.
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Citations
28 Claims
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1. A catalytic cracking process, comprising the steps of:
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hydrotreating resid;
thereafter deasphalting said hydrotreated resid to produce substantially deasphalted oil;catalytically cracking said hydrotreated oil in a catalytic cracking unit in the presence of a cracking catalyst to produce upgraded oil leaving coked catalyst; and regenerating said coked catalyst in the presence of a combustion-supporting gas comprising excess molecular oxygen in an amount greater than the stoichiometric amount required for substantially completely combusting the coke on said catalyst to carbon dioxide. - View Dependent Claims (2, 3, 4, 5)
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6. A catalytic cracking process, comprising the steps of:
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feeding virgin unhydrotreated resid to a reactor; feeding resins to said reactor; feeding hydrotreating catalyst to said reactor; injecting hydrogen-rich gases to said reactor; hydrotreating said virgin resid and resins in said reactor by contacting said virgin resid and resins with said hydrogen-rich gases in the presence of said hydrotreating catalyst and in the absence of a hydrogen donor under hydrotreating conditions to produce hydrotreated resid oil; fractionating said hydrotreated resid oil into fractions of gas oil and resid bottoms; separating asphaltenes, resins, and deasphalted oil from said resid bottoms by solvent extraction; recycling said resins to said reactor; and catalytically cracking said gas oil and deasphalted oil in the presence of a cracking catalyst and in the absence of hydrogen-rich gases to produce upgraded oil. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A catalytic cracking process, comprising the steps of:
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feeding atmospheric gas oil from an atmospheric tower to a cracking reactor of a catalytic cracking unit, said cracking reactor comprising at least one reactor selected from the group consisting of a riser reactor and a catalytic cracker; feeding primary gas oil from a primary tower to said cracking reactor; feeding hydrotreated oil from a catalytic feed hydrotreating unit to said cracking reactor; feeding solvent-extracted oil comprising less than 5 ppm vanadium and less than 5 ppm nickel to said cracking reactor; feeding fresh and regenerated crystalline aluminosilicate cracking catalyst to said cracking reactor; catalytically cracking said gas oil, hydrotreated oil and solvent-extracted oil in said cracking reactor in the presence of said cracking catalyst under catalytic cracking conditions to produce cracked oil leaving spent coked catalyst; conveying said spent coked catalyst to a regenerator of said catalytic cracking unit; injecting air into said regenerator; regenerating said spent catalyst by substantially combusting coke on said spent catalyst in the presence of air in said regenerator; recycling said regenerated catalyst directly from said regenerator to said cracking reactor in the absence of substantially demetallizing said regenerated catalyst; separating said cracked oil in a fractionator into streams of light hydrocarbon gases, catalytic naphtha, catalytic cycle oil, and decanted oil; substantially desalting crude oil; heating said desalted crude oil in a pipestill furnace; pumping said heated crude oil to a primary distillation tower; separating said heated crude oil in said primary distillation tower into streams of naphtha, kerosene, primary gas oil, and primary reduced crude oil; conveying said primary gas oil to said catalytic cracker; pumping said primary reduced crude oil to a pipestill vacuum tower; separating said primary gas oil in said pipestill vacuum tower into streams of wet gas, heavy gas oil, and vacuum reduced crude oil providing resid oil; feeding fresh feed comprising said resid oil from said pipestill vacuum tower to a resid hydrotreating unit comprising a series of three ebullated bed reactors; injecting hydrogen-rich gases into said ebullated bed reactors; conveying resid hydrotreating catalyst to said ebullated bed reactors; ebullating said resid oil and said hydrogen-rich gases together in the presence of said resid hydrotreating catalyst in said ebullated bed reactors at a pressure ranging from about 2550 psia to about 3050 psia to produce upgraded hydrotreated resid oil; separating at least a portion of said hydrotreated resid oil in an atmospheric tower into atmospheric streams of distillate, gas oil, and atmospheric tower bottoms comprising atmospheric resid oil; conveying said atmospheric stream of gas oil from said atmospheric tower to said cracking reactor; separating said atmospheric resid oil in a resid vacuum tower into vacuum streams of vacuum gas oil and vacuum tower bottoms comprising vacuum resid oil; conveying said vacuum gas oil from said resid vacuum tower to a catalytic feed hydrotreating unit; feeding coker gas oil to said catalytic feed hydrotreating unit; injecting hydrogen-rich gases to said catalytic feed hydrotreating unit; conveying catalytic feed hydrotreating catalyst to said catalytic feed hydrotreating unit; hydrotreating said vacuum gas oil and said coker gas oil with said hydrogen-rich gases in the presence of said catalytic feed hydrotreating catalyst in said catalytic feed hydrotreating unit to produce hydrotreated oil; passing said hydrotreated oil to said cracking reactor; conveying a portion of said vacuum tower bottoms from said resid vacuum tower to a coker; coking said vacuum tower bottoms in said coker to produce coke and coker resid oil; conveying said coker resid oil to a combined tower; separating said coker resid oil in said combined tower into streams of coker gases, coker naphtha, and coker gas oil; conveying said coker gas oil from said coker to said catalytic feed hydrotreating unit; conveying and feeding a substantial portion of said vacuum tower bottoms from said resid vacuum tower to a multistage solvent extraction unit; feeding a solvent to said multistage solvent extraction unit, said solvent comprising a member selected from the group consisting of butane and pentane; substantially deasphalting and solvent-extracting said vacuum tower bottoms with said solvent in said multistage solvent extraction unit to separate said vacuum tower bottoms into streams of substantially deasphalted solvent-extracted oil, substantially deasphalted solvent-extracted resins, and substantially deresined solvent-extracted asphaltenes; recovering said solvent under supercritical conditions and recycling said solvent to said solvent extraction unit; conveying said resins from said solvent extraction unit to said resid hydrotreating unit; transporting at least some of said asphaltenes for use as solid fuel; and conveying said solvent-extracted oil from said solvent extraction unit to said cracking reactor. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification