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Dewaxing and Wax Filterability by Reducing Scraper Speed in Scraped Surface Chilling Unts
| Content Provider | Semantic Scholar |
|---|---|
| Author | Allocca, Firm-Joseph J. |
| Copyright Year | 2017 |
| Abstract | Primary Examiner-Delbert E. Gantz Assistant Examiner-William Leader Attorney, Agent, or Firm-Joseph J. Allocca (57) 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 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 temperature is reached and complet. ing the cooling of the oil to the separation temperature in rotating element scraped surface chillers, the im provement comprising operating the scraped surface chillers at a chilling temperature range of at least 30 F. . while reducing the operating speed of the rotating ele ments in the scraped surface chiller to a speed of from 5. to 20% preferably 8 to 14% of the original design oper ation speed. Operation at this reduced speed improves . : wax separation rates by about 10 to 20% while not i. adversely effecting the heat transfer performance of the chillers. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://patentimages.storage.googleapis.com/99/7d/cc/bff7b9981d4d26/US4334978.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
