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:
Sep. 19, 1978
Filed:
Jul. 05, 1977
Charles W Harrison, Nederland, TX (US);
Leonard R Watts, Nederland, TX (US);
Texaco Inc., New York, NY (US);
Abstract
A solvent dewaxing process wherein an intermediate range waxy distillate oil, heated for dissolving all wax therein, is mixed with about 1-4 volumes dewaxing solvent having a temperature in the range of 60.degree.-80.degree. F for forming an oil-solvent mixture having a temperature below depressed cloud point. The oil-solvent mixture is subsequently cooled at 1.degree.-8.degree. F/min to a selected separation temperature for precipitating wax and forming a first wax/oil/solvent mixture. Additional solvent, at about the separation temperature, is mixed with first wax/oil/solvent mixture in an amount equivalent to about 1-2 volumes of waxy oil charge for precipitating additional wax and forming a second wax/oil/sovent mixture. Precipitated wax is separated, at said separation temperature from said second wax/oil/solvent mixture.