Integrated process configuration involving the steps of pyrolysis, hydrocracking, hydrodealkylation and steam cracking

A process for processing plastic waste comprising:

• (a) converting a plastic waste to a hydrocarbon liquid stream and a first C1 to C4 gas stream in a pyrolysis unit;
• (b) contacting at least a portion of the hydrocarbon liquid stream with a first hydroprocessing catalyst in the presence of hydrogen in a hydroprocessing unit to yield a first hydrocarbon product and a second C1 to C4 gas stream, wherein the first hydrocarbon product comprises C5+ liquid hydrocarbons;
• (c) introducing at least a portion of the first hydrocarbon product to a first separating unit to produce a treated hydrocarbon stream and a first heavies stream, wherein the treated hydrocarbon stream comprises C5 to C8 hydrocarbons, and wherein the first heavies stream comprises C9+ hydrocarbons;
• (d) contacting at least a portion of the first heavies stream with a second hydroprocessing catalyst in the presence of hydrogen in a hydrodealkylating unit to yield a second hydrocarbon product and a third C1 to C4 gas stream, wherein the second hydrocarbon product comprises C5+ liquid hydrocarbons, and wherein an amount of C6 to C8 aromatic hydrocarbons in the second hydrocarbon product is greater than an amount of C6 to C8 aromatic hydrocarbons in the first heavies stream;
• (e) conveying at least a portion of the second hydrocarbon product to the first separating unit;
• (f) feeding at least a portion of the treated hydrocarbon stream to a steam cracker to produce a steam cracker product stream, wherein an amount of olefins in the steam cracker product stream is greater than an amount of olefins in the treated hydrocarbon stream;
• (g) introducing at least a portion of the steam cracker product stream to a second separating unit to produce an olefin gas stream, a saturated hydrocarbons gas stream, an aromatics stream, and a second heavies stream;
• wherein the olefin gas stream comprises ethylene, propylene, butylenes, butadiene, or combinations thereof;
• wherein the saturated hydrocarbons gas stream contains methane, ethane, propane, butanes, hydrogen, or combinations thereof;
• wherein the aromatics stream comprises C6 to C8 aromatic hydrocarbons;
• and wherein the second heavies stream comprises C5+ hydrocarbons other than C6 to C8 aromatic hydrocarbons;
• and
• (h) conveying at least a portion of the second heavies stream to the hydroprocessing unit.