Conversion of waste plastic to propylene and cumene

A process for producing cumene comprising:

• (a) converting a first plastic waste to a first hydrocarbon liquid stream and a first pyrolysis gas stream in a first pyrolysis unit;
• (b) optionally contacting at least a portion of the first hydrocarbon liquid stream with a first hydroprocessing catalyst in the presence of hydrogen in a first hydroprocessing unit to yield a first hydrocarbon product and a first C1-4 gas stream, wherein the first hydrocarbon product comprises C5+ hydrocarbons;
• (c) recycling at least a portion of the first hydrocarbon liquid stream and/or at least a portion of the first hydrocarbon product to the first pyrolysis unit;
• (d) converting a second plastic waste to a second hydrocarbon liquid stream and a second pyrolysis gas stream in a second pyrolysis unit;
• (e) contacting at least a portion of the second hydrocarbon liquid stream with a second hydroprocessing catalyst in the presence of hydrogen in a second hydroprocessing unit to yield a second hydrocarbon product and a second C1-4 gas stream, wherein the second hydrocarbon product comprises C5 to C8 hydrocarbons, and wherein the first hydroprocessing catalyst and the second hydroprocessing catalyst are the same or different;
• (f) feeding at least a portion of the second hydrocarbon product to a reforming unit to produce a reforming unit product, a third C1-4 gas stream, and a hydrogen stream, wherein the reforming unit comprises a reforming catalyst, and wherein an amount of C6 to C8 aromatic hydrocarbons in the reforming unit product is greater than an amount of C6 to C8 aromatic hydrocarbons in the second hydrocarbon product;
• (g) introducing at least a portion of the reforming unit product to a second aromatics separating unit to produce a non-aromatics recycle stream and a second aromatics stream, wherein the second aromatics stream comprises C6+ aromatic hydrocarbons;
• (h) recycling at least a portion of the non-aromatics recycle stream to the reforming unit;
• (i) introducing at least a portion of the second aromatics stream to a third aromatics separating unit to produce a benzene stream, a C7 aromatics stream, a C8 aromatics stream, a C9 aromatics stream, a C10 aromatics stream, and a C11+ aromatics stream, wherein the benzene stream comprises benzene, wherein the C7 aromatics stream comprises toluene, and wherein the C8 aromatics stream comprises xylenes and ethylbenzene;
• (j) contacting at least a portion of the C7 aromatics stream, at least a portion of the C9 aromatics stream, at least a portion of the C10 aromatics stream, or combinations thereof with a disproportionation and transalkylation catalyst in the presence of hydrogen in a disproportionation and transalkylation unit to yield a third aromatics stream, wherein the third aromatics stream comprises benzene and xylenes;
• (k) conveying at least a portion of the C11+ aromatics stream to the first hydroprocessing unit and/or the second hydroprocessing unit;
• (l) introducing at least a portion of the first pyrolysis gas stream, at least a portion of the second pyrolysis gas stream, at least a portion of the first C1-4 gas stream, at least a portion of the second C1-4 gas stream, at least a portion of the third C1-4 gas stream, or combinations thereof to a first separating unit to produce a first propylene stream, a first C2 and C4 unsaturated stream, and a saturated gas stream, wherein the first propylene stream comprises propylene, wherein the first C2 and C4 unsaturated stream comprises ethylene and butylenes, and wherein the saturated gas stream comprises hydrogen and C1 to C4 saturated hydrocarbons;
• (m) feeding at least a portion of the first C2 and C4 unsaturated stream to a metathesis reactor to produce a second propylene stream, wherein the metathesis reactor comprises a metathesis catalyst, and wherein the second propylene stream comprises propylene;
• and
• (n) feeding at least a portion of the benzene stream, and at least a portion of the first propylene stream and/or at least a portion of the second propylene stream to an alkylation unit to produce cumene, wherein the alkylation unit comprises an alkylation catalyst.