Lubricating oil dewaxing with membrane separation of cold solven

Details Lubricating oil dewaxing with membrane separation of cold solven Lubricating oil dewaxing with membrane separation of cold solven

1994-05-26

1996-02-27

Myers, Helane

Mineral oils: processes and products

Paraffin wax; treatment or recovery

Separation of paraffin from oil

208 31, 208 37, 208 38, 21050039, 210654, 585818, 585819, C10G 7306, C10G 7332

Patent

active

054945666

ABSTRACT:
A process for solvent dewaxing petroleum feedstock to separate crystallized wax from lubricant oil by filtration of a wax/oil/solvent mixture. The feedstock is sequentially cooled and mixed with cold polar solvent to form a wax crystal phase and oil-solvent phase, and-the oil-solvent filtrate stream is contacted with solvent permeable selective membrane at low temperature to recover an internal circulating permeate solvent stream and an oil-rich retentate stream containing dewaxed oil product and residual solvent. Improved operation is achieved by splitting the internal circulating solvent stream into a multiple cold solvent recycle streams and injecting a plurality of the cold solvent recycle streams into the waxy petroleum feedstock during sequential cooling and mixing. By initially injecting a cold recycle solvent stream in to the waxy petroleum feedstock at a small temperature differential near the wax crystallization temperature, shock cooling and excess small wax crystal formation is avoided.

REFERENCES:
patent: 2655486 (1953-10-01), Greene
patent: 4898674 (1990-02-01), Pasternak 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.

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