C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/252
C10G 73/08 (2006.01)
Patent
CA 1140067
(U.S. 974,070 etc.) ABSTRACT OF THE DISCLOSURE A continuous solvent dewaxing process wherein a waxy oil is prediluted with a non-autorefrigerative solvent, such as ketone and then passed, at a temperature above its cloud point to the top of a chilling zone (fig. l (26)), 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 stage-wise contact with liquid 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 to 20°F. per minute with an average temperature drop across each stage of between about 2 and 20°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. In a preferred embodiment the non-autorefrigerant solvent is employed cold so as to partially solvent dewax the waxy oil to a temperature within from about 30 to 110°F. of the final wax filtration temperature before being contacted with autorefrigerant in the auto- refrigerant chilling zone to be chilled down to the desired wax filtration temperature.
348094
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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