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1. WO2010078035 - PROCESS AND SYSTEM FOR CONVERTING BIOGAS TO LIQUID FUELS

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CLAIMS

What is claimed is:

1. A method of producing a hydrocarbon fuel, comprising: a) composite dry-wet reforming a hydrocarbon-containing gas containing from about 25% to about 50% carbon dioxide with a steam gas to form a mixture of hydrogen, carbon monoxide and carbon dioxide; b) converting the mixture of hydrogen, carbon monoxide and carbon dioxide at least partially to a methanol product; and c) converting the methanol product to the hydrocarbon fuel.

2. The method of claim 1 , wherein the hydrocarbon-containing gas is obtained by anaerobic digestion.

3. The method of claim 1, further comprising scrubbing the hydrocarbon-containing gas sufficient to remove substantially all H2S.

4. The method of claim 1, wherein the hydrocarbon-containing gas has a majority of methane and 30% to less than 50% carbon dioxide.

5. The method of claim 1, wherein the steam gas further includes air such that the reforming is a tri-reforming process including simultaneous dry reforming, wet reforming and partial oxidation.

6. The method of claim 1, wherein the mixture has a modulus of about 1 to 3, where the modulus is defined as:

[W3] - ICO3] [CO] - [CO3] .

7. The method of claim 6, wherein the modulus is 1.5 to 2.5.

8. The method of claim 1, wherein the reforming is performed at about less than 150 psi.

9. The method of claim 1 , wherein the reforming is accomplished using a packed bed reactor including a supported catalyst.

10. The method of claim 9, wherein the supported catalyst is a Ni-Ir catalyst.

11. The method of claim 10, wherein the Ni-Ir catalyst has 2.5 wt% Ni and 0.5 wt% Ir with about 0.25 wt% variation for each of Ni and Ir.

12. The method of claim 1, wherein the converting the mixture is a catalytic reaction which includes a Cu-Zn- Alumina as a catalyst in a fixed bed reactor.

13. The method of claim 1, wherein the converting the methanol product includes partially converting the methanol product to a dimethyl ether product to form a mixture of methanol and dimethyl ether.

14. The method of claim 13, wherein the partially converting the methanol product includes a DME catalyst consisting essentially of γ-alumina and Cu-Zn-alumina catalyst particles.

15. The method of claim 13, further comprising exposing the mixture of methanol and dimethyl ether to a ZSM catalyst under conditions sufficient to form the hydrocarbon fuel.

16. The method of claim 15, wherein the hydrocarbon fuel is a gasoline mixture of aliphatic hydrocarbons having C5 to Cl 2 chains and aromatic hydrocarbons including xylenes, toluenes, isopentene, and other isoparaffins.

17. The method of claim 1, wherein the converting the methanol occurs within one mile of a formation source of the hydrocarbon-containing gas.

18. An unrefined hydrocarbon fuel produced by the method of claim 1.