The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 06, 1990
Filed:
Mar. 21, 1988
Thomas E Broadhurst, Sarnia, CA;
Exxon Research and Engineering Company, Florham Park, NJ (US);
Abstract
Solvent dewaxing of waxy hydrocarbon oils using scraped surface chillers is improved by injecting cold solvent into the scraped surface chillers at multiple points to augment the indirect chilling occurring in said scraped surface chillers. In utilizing this multi-point cold solvent injecting process it is important to control the .DELTA.T occurring at each injection point within each chiller bank across the entire chiller train. The .DELTA.T at each injection point attributable only to cold solvent injection must be equal if one is to secure the benefit of the present invention which is an improved liquids/solids ratio without deterioration of the feed filter rate. Preferably, to avoid any possible deterioration of filter rate and/or liquids solids, the cold solvent injection should be completed prior to the slurry in the scraped surface chiller train experiences any shock chilling.