Dilution chilling dewaxing solvent

Details Dilution chilling dewaxing solvent Dilution chilling dewaxing solvent

C - Chemistry, Metallurgy

10

G

196/253

C10G 73/06 (2006.01)

Patent

CA 1111797

ABSTRACT OF THE DISCLOSURE 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 substan- tially instantaneous mixing of the waxy oil and solvent thereby pre- cipitating 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.

310171

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