Used lubricating oil reclaiming

Details Used lubricating oil reclaiming Used lubricating oil reclaiming

1993-08-05

1994-04-26

Breneman, R. Bruce

Mineral oils: processes and products

Refining

Purifying used oil

208 18, 208184, 208365, 208368, C10M17500, C10G 700, B01D 300

Patent

active

053064194

ABSTRACT:
A used lubricating oil comprising lube oil additives, including zinc dithiophosphate is subjected to reclaiming. Zinc dithiophosphate is thermally decomposed at a temperature of 400.degree. F. (204.degree. C.) to 1000.degree. F. (538.degree. C.) for a residence time of 10 to 120 minutes. The resulting oil is subjected to vacuum distillation. A zinc-free (i.e. ash free by ASTM D-482) distillate oil is useful as marine diesel fuel. About 5 to 25 vol % is recovered as a metal containing bottoms product, useful as asphalt extender. The process is carried out in the absence of chemical demetallizing.

REFERENCES:
patent: 2319750 (1943-05-01), Schonberg et al.
patent: 4333822 (1982-06-01), Tkac et al.
patent: 4381992 (1983-05-01), Wood et al.

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