Process to make an ashless lubricating oil with high oxidation stability
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United States of America Patent
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Aug 4, 2009
Grant Date -
Jan 29, 2009
app pub date -
Aug 6, 2008
filing date -
Dec 21, 2005
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Abstract
A process for making an ashless hydraulic fluid or paper machine oil comprising a) hydroisomerization dewaxing, b) fractionating, c) selecting a fraction having a very high VI, and a high level of molecules with cycloparaffinic functionality, and d) blending the fraction with an ashless antioxidant. A process for making ashless paper machine oil, comprising: a. selecting two lubricating base oils both having a consecutive number of carbon atoms, greater than 35 wt % total molecules with cycloparaffinic functionality, and a viscosity index greater than 150; b. blending the two lubricating base oils with an ashless antioxidant additive concentrate and no viscosity index improver to make an ashless paper machine oil; wherein the ashless paper machine oil has a result of greater than 680 minutes in the rotary pressure vessel oxidation test.
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