Dilution chilling dewaxing by modification of tower temperature

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

1977-12-27

1979-03-27

Levine, Herbert

Mineral oils: processes and products

Paraffin wax; treatment or recovery

Separation of paraffin from oil

208 38, C10G 4308

Patent

active

041464613

ABSTRACT:
An improved DILCHILL* 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 oilsolvent 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 adjusting the cold solvent addition to each stage in a manner so as to modify the temperature profile along the tower to ensure that the temperature drop per stage in the initial stages in which wax precipitation occurs is greater than the temperature drop per stage in the final or later stages in which wax precipitation occurs.

REFERENCES:
patent: 3642609 (1972-02-01), Mayer et al.
patent: 3644195 (1972-02-01), Gudelis et al.

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