Post hydrotreatment finishing of lubricant distillates
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United States of America Patent
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Jan 9, 2018
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app pub date -
Jul 15, 2016
filing date -
Sep 18, 2013
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Abstract
A method wherein either crude oil or a used oil lubricant is processed to produce an intermediate lube distillate which is then hydrotreated to produce a hydrotreated base oil which is then processed by solvent treatment to produce a higher viscosity index base oil (such as Groups II+ and/or III) and a lower viscosity index base oil (such as Groups I and/or II), in each case as compared with the viscosity index of the hydrotreated base oil. In the solvent treatment, one or more solvents are utilized to selectively separate higher viscosity index components from lower viscosity index components found in the hydrotreated base oil, and after the separations have occurred, the solvent is preferably recovered for re-use in the process.
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