Mineral oils: processes and products – Refining – Purifying used oil
Reexamination Certificate
2000-04-11
2001-08-07
Myers, Helane E. (Department: 1764)
Mineral oils: processes and products
Refining
Purifying used oil
C208S039000, C208S181000
Reexamination Certificate
active
06270657
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a process for recovering lube oil base stocks from used motor oil formulations, asphalt blend compositions containing Used Motor Oil (UMO) bottoms from the process, and asphalt pavement compositions containing the asphalt blend compositions.
Automotive lubricating oils are usually formulated from paraffin based petroleum distillate oils or from synthetic base lubricating oils. Lubricating oils are combined with additives such as soaps, extreme pressure (E.P.) agents, viscosity index (V.I.) improvers, antifoamants, rust inhibitors, antiwear agents, antioxidants, and polymeric dispersants to produce an engine lubricating oil of SAE 5 to SAE 60 viscosity.
After use, this oil is collected from truck and bus fleets, automobile service stations, and municipal recycling centers for reclaiming. This collected oil contains organo-metallic additives such as zinc dialkylthiophosphate from the original lubricating oil formulation, sludge formed in the engine, and water. The used oil may also contain contaminants such as waste grease, brake fluid, transmission oil, transformer oil, railroad lubricant, crude oil, antifreeze, dry cleaning fluid, degreasing solvents such as trichloroethylene, edible fats and oils, mineral acids, soot, earth and waste of unknown origin.
Our process, disclosed in U.S. Ser. No. 09/026,367, disclosed a new process for reprocessing UMO. This invention is directed to asphalt blends and asphalt pavements comprising the residue from our UMO process.
BRIEF SUMMARY OF THE INVENTION
In another aspect, the invention relates to a novel asphalt blend composition containing, an asphalt component and the used motor oil bottoms product prepared by the process of the present invention, with or without modification additives such as polymers, chemical gellants, and antioxidants and to paving compositions containing such modified asphalts. Generally, the asphalt blend compositions comprise (a) about 0.1 to about 20 wt. %, preferably about 0.5 wt. % to about 15 wt. % of used motor oil bottoms prepared by the process of the present invention, (b) about 0 to about 20 wt. %, preferably about 0 to about 10 wt. % of a polymer modifier, (c) about 0 to about 7 wt. %, preferably about 0 to about 5 wt. % of a chemical gellant and (d) at least about 80 wt. %, e.g., about 80 wt. % to about 99 wt. %, say, 90 wt. %, of an asphalt component obtained from conventional vacuum distillation, atmospheric distillation, solvent refining, e.g., solvent deasphalting bottoms, or naturally occurring mineral sources, e.g., Trinidad Lake asphalt. All percents herein are by weight of total composition. Asphalt paving compositions of such blend can exhibit a distinct improvement in low temperature properties, in their resistance to thermal cracking and fatigue as defined by the use of the new Superpave Performance Graded (PG) Asphalt Binder Specifications: AASHTO MP1.
In yet another aspect, the present invention relates to a pavement composition comprising aggregate and from about 1-10 wt. % of an asphalt blend containing at least about 80 wt. % of asphalt and from about 0.5-15 wt. % of the bottoms fraction of prepared by the process of the present invention.
REFERENCES:
patent: 4101414 (1978-07-01), Kim et al.
patent: 4432865 (1984-02-01), Norman
patent: 5244565 (1993-09-01), Lankton et al.
patent: 5447628 (1995-09-01), Harrison et al.
patent: 6068759 (2000-05-01), Moore et al.
Doolin Patricia K
Malone Donald P
Moore Howard F
Zalewski David J
Marathon Ashland Petroleum LLC
Myers Helane E.
Stone Richard D.
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