Continuous autorefrigerative dewaxing process and apparatus

Details Continuous autorefrigerative dewaxing process and apparatus Continuous autorefrigerative dewaxing process and apparatus

1978-12-28

1980-08-12

Levine, Herbert

Mineral oils: processes and products

Paraffin wax; treatment or recovery

Separation of paraffin from oil

196 145, C10G 4308

Patent

active

042172039

ABSTRACT:
A continuous autorefrigerant solvent dewaxing process is disclosed wherein a waxy oil is prediluted with a non-autorefrigerative solvent, such as ketone, preferably a mixture of MEK/MIBK, and then passed, at a temperature above its cloud point, to the top of a chilling zone, which is an autorefrigerant chilling zone operating on a continuous basis, and comprises a vertical, multi-staged tower, operating at constant pressure. In this chilling zone, wax is precipitated from the oil to form a waxy slurry and the so-formed slurry is further chilled down to the wax filtration temperature by stagewise contact with liquid autorefrigerant preferably propylene, which is injected into a plurality of said stages and evaporated therein so as to cool the waxy slurry at an average rate of between about 0.1.degree. to 20.degree. F. per minute with an average temperature drop across each stage of between about 2.degree. and 20.degree. F. Some of the propylene remains in the oil which serves to further dilute and reduce the viscosity of the slurry. The dewaxed oil-containing slurry may then be fed directly to wax filters without having to pass through scraped-surface chillers and filter feed drum.

REFERENCES:
patent: 2202542 (1940-05-01), Voorhees
patent: 2347809 (1944-05-01), Brandt
patent: 3549513 (1970-12-01), Woodle
patent: 3658688 (1972-04-01), Biribauer, et al.
patent: 3720599 (1973-03-01), Gould

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