Dewaxing and wax filterability by reducing scraper speed in scra

Details Dewaxing and wax filterability by reducing scraper speed in scra Dewaxing and wax filterability by reducing scraper speed in scra

1980-11-24

1982-06-15

Gantz, Delbert E.

Mineral oils: processes and products

Paraffin wax; treatment or recovery

Separation of paraffin from oil

208 37, C10G 7332

Patent

active

043349781

ABSTRACT:
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.degree. to 8.degree. F. per minute, by means of cold solvent injection until a temperature at least 30.degree. F. above the filtering temperature but less than about 40.degree. to 45.degree. F. above the filtering temperature 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.degree. 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.

REFERENCES:
patent: 1983301 (1934-12-01), Morgan
patent: 2903411 (1959-09-01), Shuman
patent: 3773650 (1973-11-01), Hislop et al.
patent: 3775288 (1973-11-01), Eagan et al.

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