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A process for increasing ethylene yield in a cracked hydrocarbon is provided. A hydrocarbon feed stream comprising at least 90% by weight of one or more C4-C10 hydrocarbons can be heated to provide an effluent stream comprising at least 10% by weight propylene. The effluent stream can be selectively

A process for increasing ethylene yield in a cracked hydrocarbon is provided. A hydrocarbon feed stream comprising at least 90% by weight of one or more C4-C10 hydrocarbons can be heated to provide an effluent stream comprising at least 10% by weight propylene. The effluent stream can be selectively separated to provide a first stream comprising heavy naphtha, light cycle oil, slurry oil, or any combination thereof and a second stream comprising one or more C4-C10 hydrocarbons. The second stream can be treated to remove oxygenates, acid gases, water, or any combination thereof to provide a third stream comprising the one or more C4-C10 hydrocarbons. The third stream can be selectively separated to provide a product stream comprising at least 30% by weight propylene. At least a portion of the product stream can be recycled to the hydrocarbon feed stream to increase ethylene yield in the effluent stream.

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What is claimed is: 1. A process for increasing ethylene yield in a cracked hydrocarbon, comprising: heating a hydrocarbon feed stream comprising at least 90% by weight of one or more C4-C10 hydrocarbons to provide an effluent stream comprising at least 5% by weight propylene; selectively separatin

What is claimed is: 1. A process for increasing ethylene yield in a cracked hydrocarbon, comprising: heating a hydrocarbon feed stream comprising at least 90% by weight of one or more C4-C10 hydrocarbons to provide an effluent stream comprising at least 5% by weight propylene; selectively separating the effluent stream to provide a first stream comprising heavy naphtha, light cycle oil, slurry oil, or any combination thereof and a second stream comprising one or more C1-C10 hydrocarbons; treating the second stream to remove oxygenates, acid gases, water, or any combination thereof to provide a third stream comprising the one or more C1-C10 hydrocarbons; selectively separating the third stream to provide a product stream comprising at least 30% by weight propylene and a tail gas stream comprising at least 30% by weight methane; recycling at least a portion of the tail gas stream to the hydrocarbon feed stream; and recycling at least a portion of the product stream to the hydrocarbon feed stream to increase ethylene yield in the effluent stream. 2. The process of claim 1, further comprising selectively separating the third stream to provide an intermediate stream comprising at least 30% by weight of one or more C4-C6 olefins and recycling at least a portion of the intermediate stream to the hydrocarbon feed stream. 3. The process of claim 1, further comprising: selectively separating the third stream to provide an aromatics stream comprising at least 5% by weight benzene, toluene, xylene, or any combination thereof; and recycling at least a portion of the aromatics stream to the hydrocarbon feed stream. 4. The process of claim 1, wherein the hydrocarbon feed stream is a result of the selective separation of a hydrocarbon. 5. The process of claim 1, further comprising: selectively separating a refinery hydrocarbon to provide a refinery effluent comprising at least 5% by weight propylene, wherein the refinery hydrocarbon comprises gas oil, full range gas oil, resid, or any combination thereof; and combining at least a portion of the refinery effluent with the effluent stream comprising at least 5% by weight propylene. 6. The process of claim 1, further comprising: selectively separating a light alkane stream to provide an alkane effluent stream comprising at least 5% by weight propylene, wherein the light alkane stream comprises ethane, propane, butanes, pentanes, hexanes or any combination thereof; quenching the alkane effluent stream to provide a quenched alkane effluent stream; and combining at least a portion of the quenched alkane effluent stream with the second stream. 7. The process of claim 5, further comprising: selectively separating a light alkane stream to provide an alkane effluent stream comprising at least 5% by weight propylene, wherein the light alkane stream comprises ethane, propane, butanes, pentanes, hexanes or any combination thereof; quenching the alkane effluent stream to provide a quenched alkane effluent stream; and combining at least a portion of the quenched alkane effluent stream with the second stream. 8. The process of claim 6, further comprising selectively separating the third stream to provide a light stream comprising at least 5% by weight ethane, propane, butanes, pentanes, hexanes or any combination thereof and recycling at least a portion of the light stream to the light alkane stream. 9. The process of claim 6, further comprising selectively separating the third stream to provide a raffinate stream comprising less than 10% by weight benzene, toluene, xylene, or any combination thereof and recycling at least a portion of the raffinate stream to the light alkane stream. 10. A process for increasing ethylene yield in a cracked hydrocarbon, comprising: heating a hydrocarbon feed stream comprising at least 90% by weight of one or more C4-C10 hydrocarbons to provide an effluent stream comprising at least 5% by weight propylene; selectively separating the effluent stream to provide a first stream comprising heavy naphtha, light cycle oil, slurry oil, or any combination thereof and a second stream comprising one or more C1-C10 hydrocarbons; treating the second stream to remove oxygenates, acid gases, water, or any combination thereof to provide a third stream comprising one or more C2-C10 hydrocarbons; selectively separating the third stream to provide a product stream comprising at least 30% by weight propylene and a tail gas stream comprising at least 30% by weight methane; mixing 40% to 95% by weight paraffin hydrocarbons having 4 or more carbon atoms and 5% to 60% by weight olefins having 4 or more carbon atoms to provide a mixed stream; passing said mixed stream to a reaction zone; contacting said mixed stream with a catalyst consisting essentially of a zeolite at conditions sufficient to provide a reaction product comprising a lighter hydrocarbon than a hydrocarbon in said mixed stream; selectively separating the reaction product to provide a light olefinic stream comprising C2-C3 olefins; and recycling at least a portion of the product stream, tail gas, and light olefinic stream to the hydrocarbon feed stream to increase ethylene yield in the effluent stream. 11. The process of claim 10, wherein the conditions sufficient to provide a reaction product comprising a lighter hydrocarbon than a hydrocarbon in said mixed stream include a reaction temperature in the range of 500° C. to 700° C., a hydrocarbon partial pressure in the range of 1 to 30 psia and a paraffin hydrocarbon conversion per pass of less than 50%. 12. The process of claim 10, further comprising: selectively separating a refinery hydrocarbon to provide a refinery effluent comprising at least 5% by weight propylene, wherein the refinery hydrocarbon comprises gas oil, full range gas oil, resid, or any combination thereof; and combining at least a portion of the refinery effluent with the effluent stream comprising at least 5% by weight propylene. 13. The process of claim 12, further comprising selectively separating a light alkane stream to provide an alkane effluent stream comprising at least 5% by weight propylene, wherein the light alkane stream comprises ethane, propane, butanes, pentanes, hexanes or any combination thereof; quenching the alkane effluent stream to provide a quenched alkane effluent stream; and combining at least a portion of the quenched alkane effluent stream with the second stream. 14. The process of claim 13, further comprising: selectively separating the third stream to provide a light stream comprising at least 20% by weight ethane, propane, or any combination thereof and a raffinate stream comprising less than 5% by weight benzene, toluene, xylene, or any combination thereof; and recycling at least a portion of the light stream and the raffinate stream to the light alkane stream. 15. The process of claim 13, wherein the refinery hydrocarbon is cracked in a fluidized catalytic cracker. 16. The process of claim 13, wherein the light alkane stream is cracked in a steam pyrolytic cracker. 17. The process of claim 10, further comprising: selectively separating a light alkane stream to provide an alkane effluent stream comprising at least 5% by weight propylene, wherein the light alkane stream comprises ethane, propane, butanes, pentanes, hexanes or any combination thereof; quenching the alkane effluent stream to provide a quenched alkane effluent stream; and combining at least a portion of the quenched alkane effluent stream with the second stream. 18. The process of claim 10, further comprising: selectively separating the third stream to further provide an intermediate stream comprising at least 30% by weight of one or more C4-C6 olefins, and an aromatics stream comprising at least 5% by weight benzene, toluene, xylene, or any combination thereof; and further comprising recycling at least a portion of the tail gas, intermediate, and aromatics stream to the hydrocarbon feed stream. 19. A process for increasing ethylene yield in a cracked hydrocarbon, comprising: heating a hydrocarbon feed stream comprising at least 90% by weight of one or more C4 C10 hydrocarbons to provide an effluent stream comprising at least 20% by weight propylene, wherein the hydrocarbon feed stream is provided by selectively separating a hydrocarbon comprising methane and propylene; selectively separating the effluent stream to provide a first stream comprising heavy naphtha, light cycle oil, slurry oil, or any combination thereof and a second stream comprising one or more C1-C10 hydrocarbons; treating the second stream to remove oxygenates, acid gases, water, or any combination thereof to provide a third stream comprising one or more C4-C10 olefins; selectively separating the third stream to provide a product stream comprising at least 30% by weight propylene and a tail gas stream comprising at least 30% by weight methane; mixing 40% to 95% by weight paraffin hydrocarbons having 4 or more carbon atoms and 5% to 60% by weight olefins having 4 or more carbon atoms to provide a mixed stream; passing said mixed stream to a reaction zone; contacting said mixture with a catalyst consisting essentially of a zeolite at conditions sufficient to provide a reaction product comprising a lighter hydrocarbon than the hydrocarbons in said mixture, said conditions including a reaction temperature in the range of 500° C. to 700° C., a hydrocarbon partial pressure in the range of 1 to 30 psia and a paraffin hydrocarbon conversion per pass of less than 50%; selectively separating the reaction product to provide a light olefinic stream comprising C2-C3 olefins; and recycling at least a portion of the tail gas, product stream, and light olefinic stream to the hydrocarbon feed stream to increase ethylene yield in the effluent stream.