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:
Aug. 16, 1983
Filed:
Oct. 08, 1981
Laird C Fletcher, Natchitoches, LA (US);
Richard H O'Blasny, Natchitoches, LA (US);
Delta Central Refining, Inc., Natchitoches, LA (US);
Abstract
In accordance with the present invention, a process is provided for removing impurities from heavy and light lube oil fractions that have been obtained from waste lubricating oil. The impurities in the light lube oil fraction are removed utilizing tetrahydrofurfuryl alcohol in an extraction column (10). An oil-rich raffinate has the solvent removed therefrom by steam distillation and stripping at reduced pressure in a distillation tower (20). The heavy lube oil fraction is purified in a manner similar to the purification of the light lube oil fraction. Alternatively, most of the tetrahydrofurfuryl alcohol can be removed from the oil-rich raffinate by mixing the raffinate with methanol in an extraction column. The last of the tetrahydrofurfuyl alcohol is then removed from the oil by steam distillation and stripping at a reduced pressure. The finished heavy and light lube oil may then be subjected to further treatment, such as polishing steps, or additives may be blended into the lube oil product depending on the desired use.