Lubricating oil dewaxing with membrane separation

Details Lubricating oil dewaxing with membrane separation Lubricating oil dewaxing with membrane separation

1996-04-16

1997-07-29

Myers, Helane

Mineral oils: processes and products

Paraffin wax; treatment or recovery

Separation of paraffin from oil

208 37, 208 38, 208 31, 21050039, 210654, 585819, C10G 7306

Patent

active

056518773

ABSTRACT:
A semicontinuous process for solvent dewaxing a waxy petroleum oil feed stream including the steps of: diluting of the waxy oil feed stream with solvent; feeding cold oil/solvent/wax mixture to a filter to remove the wax and obtain an oil/solvent filtrate stream; contacting the oil/solvent filtrate stream with a selective semipermeable membrane to selectively transfer solvent through the membrane to obtain a solvent-rich permeate; and periodically directing a warm stream of recovered solvent onto the membrane surface to wash the membrane and remove impurities therefrom.

REFERENCES:
patent: 4206034 (1980-06-01), Broadhurst
patent: 4532041 (1985-07-01), Shuey et al.
patent: 5067970 (1991-11-01), Wang et al.
patent: 5084183 (1992-01-01), Lafreniere et al.
patent: 5264166 (1993-11-01), White et al.
patent: 5358625 (1994-10-01), Gould et al.
patent: 5360530 (1994-11-01), Gould et al.
patent: 5401383 (1995-03-01), Ewener
patent: 5494566 (1996-02-01), Gould et al.

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