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:
Mar. 22, 1977
Filed:
Jun. 05, 1974
James D Bushnell, Berkeley Heights, NJ (US);
Exxon Research and Engineering Company, Linden, NJ (US);
Abstract
Lubricating oil stocks are upgraded by contacting same with a solvent comprising a mixture of n-methyl-2-pyrrolidone (NMP) and phenol. The solvent may also contain a minor amount of water. The phenol concentration in the solvent ranges between about 20 and 80 LV% based on the total amount of NMP, phenol and water in the solvent, while the water concentration in the solvent ranges between 0 and about 10 LV% based on the total amount of NMP, phenol and water in the solvent and preferably between about 1 and 4 LV%. At least a portion of the solvent is recovered from the thus-formed extract and raffinate phases by heating same to temperatures in the range of about 500.degree. to 700.degree. F., thereby flashing off the bulk of the solvent; remaining solvent may be stripped out from the extract and raffinate phases with an inert gas such as nitrogen, light hydrocarbons or hydrogen at superatmospheric pressures. The hot, stripped raffinate may be sent directly to a hydrofiner reactor, if desired, for further improvement of color, carbon residue, viscosity characteristics, sulfur removal, etc.