Composition and Method of Use of a Concentrated Asphaltene Polymer Residue from VTAE
AssigneeSafety-Kleen Systems, Inc.
InventorsAbdel Mekhhal, Joel W. Garrett, Colin P. Colvin
Life of this patent
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Abstract
Used lubricating oils are fed to a dehydration/fuel stripping unit to create de-watered/defueled feedstock which is fed to a Vacuum Distillation Column (VDC) to remove and send lighter fractions for processing into base oil. Vacuum Tower Asphalt Extender (VTAE) is collected from the Vacuum Distillation Bottom (VDB) of the VDC and fed to a Solvent Deasphalting unit (SDA) along with a hydrocarbon solvent, to create a Concentrated Asphaltene Polymer Residue (CAPR) containing concentrations of the depleted polymer additives and wear metals. In particular embodiments, the CAPR is used to create relatively high-grade asphalt binders suitable for paving applications.
Claims23
A method for refining residual Vacuum Tower Asphalt Extender (VTAE) collected in a Vacuum Distillation Bottom (VDB) of a Vacuum Distillation Column (VDC) when re-refining used lubricating oils containing depleted polymer additives and wear metals, the method comprising:
- (a) feeding used lubricating oils as a feedstock to a dehydration/fuel stripping unit to create de-watered/defueled feedstock;
- (b) feeding the de-watered/defueled feedstock to a VDC to remove and send lighter fractions for processing into base oil;
- and
- (c) collecting VTAE from the VDB of the VDC and feeding the VTAE to a Solvent Deasphalting unit (SDA) along with a hydrocarbon solvent, to create a Concentrated Asphaltene Polymer Residue (CAPR) containing concentrations of the depleted polymer additives and wear metals.
A Concentrated Asphaltene Polymer Residue (CAPR) comprising:
- depleted polymer from the group consisting of Ethylene-propylene copolymers and hydrogenated styrene-diene copolymers (butadiene, isoprene), Polymethacrylate (PMA) Polymers, polyisobutenes (PIB), poly (alkyl methacrylates), poly (styrene-dienes), polyisoperenes, olefin copolymers (OCPs), and combinations thereof;
- wear metals selected from the group consisting of aluminum, barium, boron, cadmium, calcium, chromium, copper, iron, lead, molybdenum, manganese, magnesium, nickel, phosphorous, silver, sodium, tin, titanium, vanadium, zinc, and combinations thereof;
- and
- a polymer modified asphalt or bitumen formulation including:
- (a) about 1-98% by weight of a base asphalt or bitumen;
- and
- (b) about 2-30% by weight of at least one or more bituminous modifier selected from the group consisting of atactic polypropylene, styrene-butadiene-sytrene (SBS), styrene-butadiene rubber (SBR), styrene-ethylene-butadiene-sytrene (SEBS), styrene-isoprene-styrene (SIBS), ethylene vinyl acetate, ethylene methacrylate, ethylene butyl acrylate, polyethylene (PE), ethylene glycidyl methacrylate (EGMA) butyl rubber, and combinations thereof.
A method for refining residual Vacuum Tower Asphalt Extender (VTAE) collected in a Vacuum Distillation Bottom (VDB) of a Vacuum Distillation Column (VDC) when re-refining used lubricating oils containing depleted polymer additives and wear metals, the method comprising:
- (a) feeding used lubricating oils as a feedstock to a dehydration/fuel stripping unit to create de-watered/defueled feedstock;
- (b) feeding the de-watered/defueled feedstock to a VDC to remove and send lighter fractions for processing into base oil;
- and
- (c) collecting VTAE from the VDB of the VDC and feeding the VTAE to a Vacuum Distillation Unit (VDU), along with a hydrocarbon solvent, to create a Concentrated Asphaltene Polymer Residue (CAPR) containing concentrations of the depleted polymer additives and wear metals.
Dependencies are inferred from the claim text.