Process for converting waste plastic into lubricating oils
First Claim
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1. A continuous process for converting waste plastic into lube oil stock comprising:
- (a) passing a waste and/or virgin polyolefin into a heating unit blanketed with an inert gas and maintained at a temperature between 150°
C. and 350°
C. to provide a molten feed;
(b) continuously passing the molten feed through a flow-through pyrolysis reactor maintained at a temperature sufficient to depolymerize at least a portion of the polyolefin and at an absolute pressure of at least one bar to produce a pyrolyzed effluent;
(c) passing at least a portion of the effluent from the pyrolysis reactor to a catalytic isomerization dewaxing unit;
(d) fractionating the product from the isomerization dewaxing unit; and
(e) recovering a lubricating oil base stock.
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Abstract
Provided is a continuous process for converting waste or virgin plastics into lube oils. The plastic feed is maintained in a heater at preferred temperatures of 150° C.-350° C. The feed is continuously passed to a pyrolysis reactor preferably maintained at a temperature of 450° C.-700° C. and at atmospheric pressure. Relatively short residence times are employed. Optionally, the reactor effluent is processed in a hydrotreating unit. The effluent is fed to an isomerization dewaxing unit and fractionated to recover lube oil stocks. Preferably, the feed to the pyrolysis reactor can be a blend of waste plastic and waxy Fischer-Tropsch fractions.
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Citations
19 Claims
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1. A continuous process for converting waste plastic into lube oil stock comprising:
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(a) passing a waste and/or virgin polyolefin into a heating unit blanketed with an inert gas and maintained at a temperature between 150°
C. and 350°
C. to provide a molten feed;
(b) continuously passing the molten feed through a flow-through pyrolysis reactor maintained at a temperature sufficient to depolymerize at least a portion of the polyolefin and at an absolute pressure of at least one bar to produce a pyrolyzed effluent;
(c) passing at least a portion of the effluent from the pyrolysis reactor to a catalytic isomerization dewaxing unit;
(d) fractionating the product from the isomerization dewaxing unit; and
(e) recovering a lubricating oil base stock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16, 17, 18, 19)
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11. A continuous process for converting waste or virgin plastic into lube oil stock comprising the steps of:
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(a) passing solid waste and/or virgin polyethylene or a liquid containing said polyethylene into a heating unit maintained at a temperature of about 200°
C. to about 350°
C. and under a blanket of an inert gas to provide a heated feed;
(b) continuously passing the heated feed through a pyrolysis flow-through reactor maintained at a temperature of about 500°
C. to about 650°
C., a pressure of about 1 bar, and a residence time up to about 1 hour to produce a pyrolyzed effluent;
(c) passing the effluent from the pyrolysis reactor to a separator and recovering at least a heavy fraction;
(d) passing at least a portion of the said heavy fraction to a catalytic isomerization dewaxing unit;
(e) passing the product from the isomerization dewaxing unit to a distillation unit; and
, recovering a lube oil stock.- View Dependent Claims (12, 13, 14, 15)
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Specification