C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/252
C10G 73/32 (2006.01)
Patent
CA 1227153
ABSTRACT OF THE DISCLOSURE An improved process for dewaxing waxy hydro- carbon oils, wherein said waxy oil is introduced at a temperature above its cloud point into a direct chill- ing zone divided into a plurality of stages, passing said waxy oil from stage-to-stage of said chilling zone, introducing a cold dewaxing solvent into at least a portion of said stages, maintaining a high degree of agitation in at least a portion of the stages containing solvent and waxy oil, thereby ef- fecting substantially instantaneous mixing thereof while cooling said solvent-waxy oil mixture, to a temperature greater than the wax separation tempera- ture, whereby a substantial portion of the wax is precipitated from said waxy oil and forming a sol- ventoil mixture containing precipitated wax (slurry I), withdrawing said slurry I from said direct chill- ing zone and cooling same to the wax separation tem- perature in an indirect chilling zone thereby preci- pitating a further portion of wax from said waxy oil and separating said precipitated wax from the wax-oil- solvent mixture in solid-liquid separation means, the improvement comprising using as the indirect chilling zone an indirect heat exchanger means operated at a high level of agitation. Expressed in terms of Impeller Reynolds Number the agitation is on the order of about 1,000 to 1,000,000. Alternatively, the staged, agitated, direct chilling zone is totally replaced by the high agita- tion indirect heat exchanger means.
444548
Borden Ladner Gervais Llp
Imperial Oil Limited
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