Process for producing a transformer oil having lower pour point and improved oxidation stability
AssigneeGulf Research & Development Company
InventorsAngelo Anthony Montagna, Allen Evarts Somers, Raynor Tyler Sebulsky
Life of this patent
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Abstract
Transformer oils having pour points below -40.degree. F. (-40.00.degree. C.) are produced by the process of reducing the nitrogen concentration of a petroleum hydrocarbon feed stock, contacting the denitrogenated product with a catalyst comprising a Group IV-B metal and a Group VIII noble metal on a decationized crystalline mordenite support under pour point reduction conditions of temperature, pressure and space velocity, and thereafter passing the product of the pour point reduction step to a lubricating oil oxidation stability step.
Claims7
A process for producing a transformer oil having a lower pour point and improved oxidation stability which comprises contacting a petroleum lubricating oil feed having a nitrogen concentration of less than 30 ppm and having a Saybolt Universal viscosity at 100.degree. F. in the range of 52 to 62 seconds with hydrogen and a pour point reduction catalyst under pour point reduction reaction conditions, said pour point reduction catalyst comprising a Group IV-B metal, a Group VIII noble metal, and a decationized mordenite support, said pour point reduction reaction conditions providing for a lubricating oil product wherein from 8 to 30 weight percent of said oil feed has been converted to products boiling below 450.degree. F., and subjecting said lubricating oil product having a lower pour point to an oxidation stabilization step to provide said transformerail.
A process for producing a transformer oil having a lower pour point and improved oxidation stability which comprises contacting a petroleum lubricating oil feed having a nitrogen concentration greater than 30 ppm and having a Saybolt Universal viscosity at 100.degree. F. in the range of 52 to 62 seconds with hydrogen and a denitrogenation catalyst in a denitrogenatin zone under hydrodenitrogenation reaction conditions, recovering a lubricating oil product from said hydrodenitrogenation reaction containing less than 30 ppm nitrogen, contacting said lubricating oil from said hydrodenitrogenation reaction with hydrogen and a pour point reduction catalyst under pour point reduction reaction conditions, said pour point reduction catalyst comprising a Group IV-B metal, a Group VIII noble metal, and a decationized mordenite support, said pour point reduction reaction conditions providing for a lubricating oil product wherein from 8 to 30 weight percent of said oil feed has been converted to products boiling below 450.degree. F., and subjecting said lubricating oil product having a lower pour point to an oxidation stabilization step to provide said transformer oil.
Dependencies are inferred from the claim text.