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US 8,523,959 B2Granted
Paraffinic biologically-derived distillate fuels with bio-oxygenates for improved lubricity and methods of making same
AssigneeChevron U.S.A. Inc.
InventorDennis J. O'Rear
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Abstract
The present invention is generally directed to methods for making fuels from biomass comprising triglyceride species, whereby the biomass is subjected to partial hydrodeoxygenation and (optionally) catalytic isomerization. The partial-hydrodeoxygenation of the triglyceride species produces a fuel that retains some oxygenates for enhanced lubricity.
Claims30
A method comprising the steps of:
- (a) providing a biofuel precursor material, wherein the biofuel precursor material comprises triglycerides;
- (b) partially-hydrodeoxygenating triglycerides in the biofuel precursor material to yield a biofuel intermediate comprising linear hydrocarbon species and residual oxygenates;
- and
- (c) catalytically-isomerizing at least a portion of the biofuel intermediate using an isomerization catalyst to yield a biofuel comprising isoparaffins and residual oxygenates;
- wherein the steps of partially-hydrodeoxygenating and catalytically isomerizing are carried out sequentially, and wherein the above steps are carried out such that the resulting biofuel comprises paraffins in an amount greater than or equal to 90 wt %;
- isoparaffins in an amount greater than or equal to 50% of the paraffins;
- and oxygen, in the form of residual oxygenates, in an amount greater than or equal to 0.001 wt % on a water and air free basis;
- and wherein the resulting biofuel has a difference in the ASTM D86 90 and 10 percent points of 300° F. or less.
5 more elements
A method comprising the steps of:
- (a) providing a biofuel precursor material, wherein the biofuel precursor material comprises triglycerides;
- (b) partially-hydrodeoxygenating triglycerides in the biofuel precursor material to yield a biofuel intermediate comprising linear hydrocarbon species and residual oxygenates;
- (c) catalytically-isomerizing at least a portion of the biofuel intermediate using an isomerization catalyst to yield a biofuel comprising isoparaffins and residual oxygenates;
- and
- (d) analyzing oxygen content while said method is being carried out,
- wherein the steps of partially-hydrodeoxygenating and catalytically isomerizing are carried out sequentially, wherein the step of partially-hydrodeoxygenating the triglycerides is carried out in an upflow reactor configuration, wherein the above steps are carried out such that the resulting biofuel comprises paraffins in an amount greater than or equal to 90 wt %;
- isoparaffins in an amount greater than or equal to 50% of the paraffins;
- and oxygen, in the form of residual oxygenates, in an amount greater than or equal to 0.001 wt % on a water and air free basis;
- and wherein the resulting biofuel has a difference in the ASTM D86 90 and 10 percent points of 300° F. or less, and wherein the biofuel precursor material comprises at least 25 weight percent triglycerides.
6 more elements
Dependencies are inferred from the claim text.