Treating and steam cracking a combination of plastic-derived oil and used lubricating oils to produce high-value chemicals
AssigneeSabic Global Technologies B.V.
InventorsNicolas Goyheneix, Lara Galan-Sanchez
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Abstract
Systems and methods for producing one or more olefins using waste plastics and used lubricating oil are disclosed. Mixed waste plastic is processed in a pyrolysis unit to produce plastic derived oil. The plastic derived oil is subsequently blended with used lubricating oil to form a mixture. The mixture is then separated into (1) a light-end stream comprising C1 to C8 hydrocarbons and (2) a heavy hydrocarbon feed stream. The heavy hydrocarbon feed stream is then processed to produce a steam cracking feedstock stream. The light end-stream and/or the steam cracking feedstock stream are then flowed into a cracking unit to produce one or more olefins.
Claims15
A method of producing one or more olefins, the method comprising:
- pyrolyzing a plastic material in a pyrolysis unit to form a plastic derived oil;
- blending the plastic derived oil with a used lubricating oil to form a blended hydrocarbon feed;
- separating the blended hydrocarbon feed to form (1) a light-end stream comprising primarily C1 to C8 hydrocarbons and (2) a heavy hydrocarbon feed;
- hydroprocessing the light-end stream to produce a hydroprocessed light-end stream;
- flowing the hydroprocessed light-end stream to a steam cracking unit;
- processing the heavy hydrocarbon feed to produce a steam cracking feedstock;
- and
- cracking (1) hydrocarbons of the steam cracking feedstock and (2) hydrocarbons of the light-end stream to produce one or more olefins;
- wherein the processing of the heavy hydrocarbon feed comprises:
- distilling the heavy hydrocarbon feed via vacuum distillation to produce a vacuum distillation residue and a vacuum distilled hydrocarbon stream;
- processing the vacuum distilled hydrocarbon stream via liquid-liquid extraction to produce a poly-aromatics stream comprising primarily poly-aromatics and an intermediate stream comprising paraffinic, aromatic, and naphthenic hydrocarbons;
- hydroprocessing the intermediate stream to produce the steam cracking feedstock;
- and
- recycling the poly-aromatics stream and/or the vacuum distillation residue to the pyrolysis unit;
- wherein a used lubricating oil is lubricating oil that has partially or completely lost its capability of reducing the friction, heat, and wear between mechanical components after a period of usage or that has accumulated contaminants after a period of usage;
- wherein the hydroprocessing of the intermediate stream is performed at a pressure of 70 to 200 barg and at an increased pressure and/or increased temperature compared to the hydroprocessing of the light-end stream;
- and
- wherein the pyrolizing is carried out at a temperature in a range of 100 to 500° C.
Dependencies are inferred from the claim text.