Dilution chilling dewaxing solvent

Details Dilution chilling dewaxing solvent Dilution chilling dewaxing solvent

1976-10-28

1978-09-05

Levine, Herbert

Mineral oils: processes and products

Paraffin wax; treatment or recovery

Separation of paraffin from oil

208 38, C10G 4308

Patent

active

041117905

ABSTRACT:
An improvement in a dilution chilling dewaxing process wherein waxy lubricating oil stocks are solvent dewaxed by contacting them with successive increments of cold dewaxing solvent at a plurality of points along the height of a vertical tower divided into a plurality of stages while agitating the oil-solvent mixture in each stage to provide substantially instantaneous mixing of the waxy oil and solvent thereby precipitating wax from the oil while avoiding the well known shock chilling effect. The improvement resides in using as the dewaxing solvent, a mixture selected from the group consisting of (a) methylene chloride and (b) acetone, methylethyl ketone, methanol and mixtures thereof, and wherein the methylene chloride comprises at least about 20 LV% of the dewaxing solvent. This invention results in substantial energy savings, requires less solvent per volume of waxy oil feed and gives significant improvements in the filtration rate of the dewaxed oil over conventional autorefrigerant and/or ketone dewaxing solvents.

REFERENCES:
patent: 1978010 (1934-10-01), Carlisle
patent: 3719585 (1973-03-01), Brasher et al.
patent: 3871991 (1975-03-01), Shaw

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