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

A system for processing plastic waste comprising a pyrolysis unit, a hydroprocessing unit, a first separating unit, a hydrodealkylating unit, a steam cracker, and a second separating unit;

• wherein the pyrolysis unit is configured to receive a plastic waste and to produce a hydrocarbon liquid stream and a first C1 to C4 gas stream;
• wherein the hydroprocessing unit comprises a first hydroprocessing catalyst, wherein the hydroprocessing unit is configured to receive hydrogen and at least a portion of the hydrocarbon liquid stream and to produce a first hydrocarbon product and a second C1 to C4 gas stream, and wherein the first hydrocarbon product comprises C5+ liquid hydrocarbons;
• wherein the first separating unit comprises a distillation column configured to receive at least a portion of the first hydrocarbon product and to produce a treated hydrocarbon stream and a first heavies stream, wherein the treated hydrocarbon stream comprises C5 to C8 hydrocarbons, wherein the treated hydrocarbon stream meets steam cracker feed requirements for chloride content, olefin content, and boiling end point, and wherein the first heavies stream comprises C9+ hydrocarbons;
• wherein the hydrodealkylating unit comprises a second hydroprocessing catalyst, wherein the hydrodealkylating unit is configured to receive hydrogen and at least a portion of the first heavies stream and to produce a second hydrocarbon product and a third C1 to C4 gas stream, wherein the second hydrocarbon product comprises C5+ liquid hydrocarbons, 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, and wherein the first hydroprocessing catalyst and the second hydroprocessing catalyst are the same or different;
• wherein the steam cracker is configured to receive at least a portion of the treated hydrocarbon stream and 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;
• and
• wherein the second separating unit comprises a plurality of distillation columns configured to receive at least a portion of the steam cracker product stream and 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 comprises methane, ethane, propane, butanes, hydrogen, or combinations thereof;
• wherein the aromatics stream comprises C6 to C8 aromatic hydrocarbons;
• wherein an amount of C6 to C8 aromatic hydrocarbons in the aromatics stream is greater than an amount of C6 to C8 aromatic hydrocarbons in the second hydrocarbon product;
• wherein the second heavies stream comprises C5+ hydrocarbons other than C6 to C8 aromatic hydrocarbons;
• and wherein a C9+ hydrocarbons content of a combination of the olefin gas stream, saturated hydrocarbons gas stream, and aromatics stream is less than about 5 wt. %, based on the weight of the combination of the olefin gas stream, saturated hydrocarbons gas stream, and aromatics stream.