C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/252
C10G 73/00 (2006.01)
Patent
CA 1061732
ABSTRACT OF DISCLOSURE A dewaxing process is described wherein a waxy oil stock is introduced into a cooling zone and contacted therein with dewaxing solvent system comprising two or more solvents. The solvents are introduced into the cooling zone in incremental amounts. The composition of the solvents introduced into the cooling zone is gradually reduced, in order to produce temporary periods of solvent-oil immiscibility within said cooling zone interspersed with periods of miscibility. The solvent admixture is cooled and agitated as it passes through the cooling zone thereby precipitating at least a portion of the wax therefrom and forming a solvent-oil mixture containing precipitated wax. The mixture is subsequently removed from the cooling zone and oil of diminished wax content recovered therefrom. In one embodiment of the invention, the cooling zone comprises a plurality of stages and a high level of agitation is maintained within at least a portion of the solvent- containing stages thereby providing substantially instantaneous mixing of the solvent and the oil therein. The process is particularly useful for dewaxing heavy petroleum oil feedstocks, which have previously been subjected to a predilution operation.
222576
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