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US 8,592,492 B2Granted
Using fossil fuels to increase biomass-based fuel benefits
AssigneePraxair Technology, Inc.
InventorsShrikar Chakravarti, Raymond Francis Drnevich, Dante Patrick Bonaquist, Gregory Panuccio
Life of this patent
Estimating the term…
Abstract
In the production of fuel such as ethanol from carbonaceous feed material such as biomass, a stream comprising hydrogen and carbon monoxide is added to the raw gas stream derived from the feed material, and the resulting combined stream is converted into fuel and a gaseous byproduct such as by a Fischer-Tropsch reaction. The gaseous byproduct may be utilized in the formation of the aforementioned stream comprising hydrogen and carbon monoxide.
Claims23
A method, comprising
- (A) providing fossil-fuel hydrocarbon feed;
- (B) forming from said fossil-fuel hydrocarbon feed a gaseous product stream comprising hydrogen and carbon monoxide at a mole ratio of H2:CO of at least 2.0:1;
- (C) forming a syngas stream that is derived from carbonaceous feed material and subjecting this syngas stream to partial oxidation;
- (D) adding the gaseous product stream formed in step (B) to a the partially oxidized syngas stream derived from carbonaceous feed material, in a sufficient amount to form a mixed syngas stream having a H2:CO mole ratio greater than that of said partially oxidized syngas stream derived from carbonaceous feed material;
- (E) converting said mixed syngas stream to form product fuel and recovering from said converting a byproduct stream comprising one or more of hydrogen, CO, water vapor, methane, and hydrocarbons containing 2 to 8 carbon atoms and 0 to 2 oxygen atoms;
- and
- (F) reacting up to 100% of said byproduct stream in said formation of said gaseous product stream in step (B).
4 more elements
A method for improving the carbon conversion efficiency of fuel production from carbonaceous feed material, comprising
- (A) deriving a raw gaseous stream comprising hydrogen and carbon monoxide in a mole ratio of hydrogen:carbon monoxide of less than 2:1 from carbonaceous feed material;
- (B) forming a second gaseous stream comprising hydrogen and carbon monoxide in a mole ratio of hydrogen:carbon monoxide greater than 2:1 and also comprising carbon dioxide, and combining said second gaseous stream and the stream derived in step (A);
- (C) converting said combined stream into liquid product fuel, and a gaseous byproduct mixture comprising hydrogen, carbon monoxide, water vapor and methane;
- (D) reacting hydrocarbon fuel and steam to form said second gaseous stream, wherein at least a portion of said gaseous byproduct mixture is combusted to produce heat which is consumed in said reaction.
1 more element
A method, comprising:
- (A) providing fossil-fuel hydrocarbon feed to a reactor;
- (B) forming from said fossil-fuel hydrocarbon feed a gaseous product stream comprising hydrogen and carbon monoxide at a mole ratio of H2:CO of at least 2.0:1;
- (C) converting up to all of said gaseous product stream to form product fuel and recovering from said converting a byproduct stream comprising one or more of hydrogen, CO, water vapor, methane, and hydrocarbons containing 2 to 8 carbon atoms and 0 to 2 oxygen atoms;
- and
- (D) reacting up to 100% of said byproduct stream in said formation of said gaseous product stream in step (B);
- wherein steps (A)-(D) are performed sequentially without adding to said gaseous product stream any other gaseous product derived from carbonaceous feed material;
- and thereafter
- (E) forming a syngas stream containing hydrogen and CO that is derived from carbonaceous feed material, in a sufficient amount to form a mixed syngas stream having a H2:CO mole ratio greater than that of said syngas stream derived from carbonaceous feed material and adding the gaseous product stream formed in step (B) to the syngas derived from carbonaceous feed material in this step (E);
- (F) converting said mixed syngas stream to form product fuel and recovering from said converting a byproduct stream comprising one or more of hydrogen, CO, water vapor, methane, and hydrocarbons containing 2 to 8 carbon atoms and 0 to 2 oxygen atoms;
- and
- (G) reacting up to 100% of said byproduct stream in said formation of said gaseous product stream in step (B).
8 more elements
Dependencies are inferred from the claim text.