Dilution chilling dewaxing by modification of tower...

Details Dilution chilling dewaxing by modification of tower... Dilution chilling dewaxing by modification of tower...

C - Chemistry, Metallurgy

10

G

196/252

C10G 73/00 (2006.01) C10G 73/32 (2006.01)

Patent

CA 1117063

ABSTRACT OF THE DISCLOSURE An improved 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 mixturein 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 cold solvent addition to each stage being adjusted ina manner so as to modify the temperature profile along the tower to insure that the temperature drop per stage in the initial stages is greater than the temper-ature drop per stage in the final or later stages.

289578

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