Renewable jet fuel blendstock from isobutanol
First Claim
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1. A process for preparing renewable jet fuel blendstock comprising:
- (a) dehydrating renewable isobutanol, thereby forming a dehydration product comprising isobutene;
(b) oligomerizing at least a portion of the dehydration product, thereby forming a product comprising one or more C8, one or more C12, and one or more C16 unsaturated oligomers;
(c) separating at least a portion of said one or more C8 unsaturated oligomers produced in step (b);
(d) combining the separated portion of step (cc) with the dehydration product of step (b) prior to said oligomerization step (b);
(e) hydrogenating at least a portion of the product of step (b) in the presence of hydrogen, thereby forming a renewable jet fuel blendstock comprising one or more C12 and one or more C16 saturated alkanes; and
(f) adjusting the ratio of C12 and C16 saturated alkanes provided by step (ge) to form a renewable jet fuel blendstock which meets or exceeds the requirements of ASTM D7566-10a for hydroprocessed synthesized paraffinic kerosene (SPK).
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Abstract
The present invention in its various embodiments is directed to methods for preparing a renewable jet fuel blendstock, and blendstocks prepared by such methods, comprising fermenting a biomass-derived feedstock to form one or more C2-C6 alcohols such as isobutanol, catalytically dehydrate and oligomerize the alcohols to form higher molecular weight olefins (e.g., C8-C16 olefins), hydrogenating at least a portion of the higher molecular weight olefins to form a renewable jet fuel blendstock comprising C12 and C16 alkanes which meet or exceed the requirements of ASTM D7566-10a for hydroprocessed synthesized paraffinic kerosene (SPK).
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Citations
7 Claims
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1. A process for preparing renewable jet fuel blendstock comprising:
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(a) dehydrating renewable isobutanol, thereby forming a dehydration product comprising isobutene; (b) oligomerizing at least a portion of the dehydration product, thereby forming a product comprising one or more C8, one or more C12, and one or more C16 unsaturated oligomers; (c) separating at least a portion of said one or more C8 unsaturated oligomers produced in step (b); (d) combining the separated portion of step (cc) with the dehydration product of step (b) prior to said oligomerization step (b); (e) hydrogenating at least a portion of the product of step (b) in the presence of hydrogen, thereby forming a renewable jet fuel blendstock comprising one or more C12 and one or more C16 saturated alkanes; and (f) adjusting the ratio of C12 and C16 saturated alkanes provided by step (ge) to form a renewable jet fuel blendstock which meets or exceeds the requirements of ASTM D7566-10a for hydroprocessed synthesized paraffinic kerosene (SPK). - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification