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US 7,128,827 B2Granted
Integrated catalytic cracking and steam pyrolysis process for olefins
AssigneeKellogg Brown & Root LLC
InventorsMichael J. Tallman, Chris Santner, Richard B. Miller
Life of this patent
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Abstract
Integration of gas oil and light olefin catalytic cracking zones with a pyrolytic cracking zone to maximize efficient production of petrochemicals is disclosed. Integration of the units in parallel allows production of an overall product stream with maximum ethylene and/or propylene by routing various feedstreams and recycle streams to the appropriate cracking zone(s), e.g. ethane/propane to the steam pyrolysis zone and C4 C6 olefins to the light olefin cracking zone. This integration enhances the value of the material balances produced by the integrated units.
Claims9
An olefin process, comprising:
- passing a light alkane stream comprising ethane, propane or a combination thereof through a steam pyrolysis zone and quenching effluent therefrom to form a pyrolysis effluent enriched in ethylene, propylene or a combination thereof;
- cracking a light hydrocarbon stream comprising olefins having at least 4 carbon atoms in a first FCC zone to form a first FCC effluent enriched in ethylene, propylene or a combination thereof;
- cracking a refinery stream comprising gas oil, full range gas oil, resid, or a combination thereof, in a second FCC zone to form a second FCC effluent enriched in ethylene, propylene or a combination thereof;
- fractionating the first and second FCC effluents together to remove heavy naphtha, light cycle oil, slurry oil, or a combination thereof and recover a combined olefin-containing FCC fraction;
- conditioning the pyrolysis effluent together with the combined FCC fraction to remove oxygenates, acid gases, water or a combination thereof to form a conditoned stream;
- separating the conditioned stream into at least a tail gas stream, an ethylene product stream, a propylene product stream, a light stream comprising ethane, propane, or a combination thereof, an intermediate stream comprising olefin selected from C4 to C6 olefins and mixtures thereof, and a heavy stream comprising C6 and higher hydrocarbons;
- recycling the light stream to the steam pyrolysis zone;
- and
- recycling the intermediate stream to the first FCC zone.
6 more elements
An olefin process unit, comprising:
- parallel steam pyrolysis, light olefin FCC and gas oil-resid FCC zones for producing a combined effluent comprising ethylene and propylene, comprising:
- means for passing a light alkane stream comprising ethane, propane or a combination thereof through the steam pyrolysis zone and quenching effluent therefrom to form a pyrolysis effluent enriched in ethylene, propylene or a combination thereof;
- means for cracking a light hydrocarbon stream comprising olefins having at least 4 carbon atoms in the light olefin FCC zone to form a first FCC effluent enriched in ethylene, propylene or a combination thereof;
- means for cracking a refinery stream comprising gas oil, full range gas oil, resid, or a combination thereof, in a gas-oil resid FCC zone to form a second FCC effluent enriched in ethylene, propylene or a combination thereof;
- means for fractionating the first and second FCC effluents together to remove heavy naphtha, light cycle oil, slurry oil, or a combination thereof and recover a combined olefin-containing FCC fraction;
- means for conditioning the combined effluent comprising the pyrolysis effluent and the combined olefin-containing FCC fraction to remove oxygenates, acid gases and water to form a conditioned stream;
- means for separating the conditioned stream into at least a tail gas stream, an ethylene product stream, a propylene product stream, a light stream comprising ethane, propane, or a combination thereof, an intermediate stream comprising olefin selected from C4 to C6 olefins and mixtures thereof, and a heavy stream comprising C6 and higher hydrocarbons;
- means for recycling the light stream to the steam pyrolysis zone;
- and
- means for recycling the intermediate stream to the first FCC zone.
7 more elements
Dependencies are inferred from the claim text.