C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/252
C10G 73/22 (2006.01)
Patent
CA 1144503
ABSTRACT OF THE DISCLOSURE A continuous combination non-autorefrigerant/autorefriger- ant solvent dewaxing process for dewaxing waxy hydrocarbon oils which comprises the steps of: (a) passing the waxy oil into a first chilling zone wherein a portion of the wax is precipitated from the oil by cooling same in the presence of a non-autorefrigerant dewaxing solvent to form a slurry comprising an oil solvent mixture and solid particles of wax; (b) passing said slurry from said first chilling zone to a second chilling zone which comprises a vertical, multi-staged tower operating at a constant pressure wherein each stage con- tains a liquid space and a vapor space above the liquid space, each of said vapor spaces also containing means for removal of autorefrigerant vapor therefrom; (c) cooling said slurry produced in said first chilling zone down to wax filtration temperature and precipitating addi- tional wax therefrom in said second chilling zone by contacting same in said second zone with a liquid autorefrigerant which is introduced under flow rate control conditions into a plurality of the stages in said second zone and allowed to evaporate there- in so as to achieve an average cooling rate of the slurry in said zone ranging from between about 0.1° to 20°F. per minute with an average temperature drop across each stage into which said liquid autorefrigerant is introduced and evaporated ranging from between about 2° to 20°F. and wherein the evaporated auto- refrigerant is removed from each of said stages into which said liquid autorefrigerant was injected in a manner such that the autorefrigerant vapor formed in any given stage does not pass through all of the stages in the tower above said stage; and (d) separating the wax from the slurry to obtain wax and a dewaxed oil solution.
399170
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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