Lube oil product stripping

Details Lube oil product stripping Lube oil product stripping

1988-10-21

1991-02-19

McFarlane, Anthony

Mineral oils: processes and products

Products and compositions

Lubricating oils

208 18, 208 58, 208 87, 208 88, 208 97, 208 95, 208100, 208102, 208111, 208177, 208354, 208355, 208356, 208357, C10G 7100

Patent

active

049941682

ABSTRACT:
The quality and yield of dewaxed, hydrotreated lube oil base stocks are improved by reducing the top temperature in the hydrotreated lube stripper so as to increase the proportion of heavy kerosene components in the lube oil base stock. The separation system provides for a two stage stripping of the lube oil fraction such that the kerosene fraction stripped from the lube product in the primary product stripper under vacuum is stripped in a second stage stripper at a higher pressure with recycle of the heavy kerosene fraction as a reflux stream to the primary vacuum stripper so that a product with improved viscosity index and flash point is separated in the primary stripper.

REFERENCES:
patent: Re28398 (1975-04-01), Chen et al.
patent: 3894938 (1975-07-01), Gorring et al.
patent: 4082647 (1978-04-01), Hutchings et al.
patent: 4181598 (1980-01-01), Gillespie et al.
patent: 4259170 (1981-03-01), Graham et al.
patent: 4372839 (1983-02-01), Oleck et al.
patent: 4437975 (1984-03-01), Gillespie et al.

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