C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/259
C10G 73/32 (2006.01)
Patent
CA 1183486
IMPROVED DEWAXING AND WAX FILTERABILITY BY REDUCING SCRAPER SPEED IN SCRAPED SURFACE CHILLING UNITS (OP-2749) ABSTRACT OF THE DISCLOSURE In hydrocarbon oil dewaxing processes comprising passing the waxy oil through a staged vertical tower, injecting cold solvent at a plurality of stages along the vertical tower under conditions of high agitation to achieve substantially instantaneous mixing at each point, continuing the chilling, preferably at a rate of from 1 to 8°F per minute, by means of cold solvent injection until a temperature at least 30°F above the filtering temperature but less than about 40° to 45°F above the filtering tem- perature is reached and completing the cooling of the oil to the separation temperature in rotating element scraped surface chillers, the improvement comprising operating the scraped surface chillers at a chilling temperature range of at least 30°F while reducing the operating speed of the rotating elements in the scraped surface chiller to a speed of from 5 to 20% preferably 8 to 14% of the original design operation speed. Operation at this reduced speed improves wax separation rates by about 10 to 20% while not adversely effecting the heat transfer performance of the chillers. - 22 -
402661
Borden Ladner Gervais Llp
Imperial Oil Limited
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