Method of rerefining waste oil by distillation and extraction

Details Method of rerefining waste oil by distillation and extraction Method of rerefining waste oil by distillation and extraction

1997-09-08

2000-09-12

Myers, Helane E.

Mineral oils: processes and products

Refining

Purifying used oil

208189, 208311, 208179, C10G 2700

Patent

active

061173096

ABSTRACT:
A process for recovering a base oil of lubricating viscosity from used oil in which, following optional pretreatment, used oil is re-refined by distilling it in distillation apparatus having multiple theoretical plates. Impurities are then extracted from the lube range distillate fraction or fractions with a liquid extractant such as N-Methyl-2-Pyrrolidone (NMP) at a temperature below the temperature, if any, of complete miscibility of the extractant and the oil. The oil and extractant are then separated whereupon the extractant is re-used in the process and the oil is subject to further treatment, as necessary, for targeted uses.

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