Process for producing C2+ alcohols from a methane-containing feedstock, by passing the methane-containing feedstock and CO2 to a non-oxidative reforming process to produce a product stream containing CO, H2 and CO2, optionally in the presence of steam, provided that where steam is present in the fee
Process for producing C2+ alcohols from a methane-containing feedstock, by passing the methane-containing feedstock and CO2 to a non-oxidative reforming process to produce a product stream containing CO, H2 and CO2, optionally in the presence of steam, provided that where steam is present in the feed to the reforming process, the steam and CO2 are present in a molar ratio of less than 5:1. The CO, H2 and CO2 stream is passed to a bacterial fermentation step where it is converted to a liquid product stream containing one or more C2+ alcohols and a gaseous product stream containing CO, H2 and CO2. The fermentation step is operated to provide a conversion of CO of at least 60%. CO, H2 and CO2 are recycled from the gaseous product stream to the reforming process such that the H2 reacts with carbon dioxide in the reforming process.
대표청구항▼
1. A process for the production of C2+ alcohols from a methane-containing feedstock, which process comprises: (a) passing said methane-containing feedstock and carbon dioxide to a non-oxidative reforming process to produce a first product stream comprising CO, H2 and CO2, optionally in the presence
1. A process for the production of C2+ alcohols from a methane-containing feedstock, which process comprises: (a) passing said methane-containing feedstock and carbon dioxide to a non-oxidative reforming process to produce a first product stream comprising CO, H2 and CO2, optionally in the presence of steam, but with the proviso that where steam is present in the feed to the reforming process the steam and CO2 are present in a molar ratio of less than 5:1,(b) passing the first product stream comprising CO, H2 and CO2 to a bacterial fermentation step wherein it is converted to produce a second product stream comprising one or more C2+ alcohols in the liquid phase and a gaseous third product stream comprising CO, H2 and CO2, the fermentation step being operated to provide a conversion of CO of at least 60%,wherein CO, H2 and CO2 are recycled from the gaseous third product stream to the reforming process of step (a) wherein at least 80% of the CO and 80% of the CO2 in the gaseous third stream are recycled to the reforming process, and wherein the H2 reacts with carbon dioxide in the reforming process. 2. A process as claimed in claim 1 wherein the reforming process is dry-gas reforming or steam methane reforming. 3. A process as claimed in claim 2 wherein the reforming process is a sulphur passivated reforming. 4. A process as claimed in claim 1 wherein no specific separation of carbon monoxide from carbon dioxide in the product stream is performed prior to recycle. 5. A process as claimed in claim 1 wherein some of the hydrogen in the gaseous third product stream is separated and utilised as a fuel gas. 6. A process as claimed in claim 1 wherein, where steam is present, the steam:CO2 molar ratio is <1:1. 7. A process as claimed in claim 1 wherein both the reforming and fermentation steps are operated at a pressure is in the range 2 to 12 barg. 8. A process as claimed in claim 1 wherein a purge is taken from the recycled stream to prevent build-up of inerts. 9. A process as claimed in claim 1 wherein the fermentation process uses acetogenic anaerobic bacteria. 10. A process as claimed in claim 9 wherein the bacteria is selected from Acetogenium kivui, Acetobacterium woodii, Acetoanaerobium noterae, Clostridium Aceticum, Butyribacterium methylotrophicum, Clostridium acetobutylicum, Clostridium thermoaceticum, Eubacterium limosum, Peptostreptococcus productus, Clostridium ljungdahlii and Clostridium carboxydivorans. 11. A process as claimed in claim 10 wherein the bacteria is Clostridium ljungdahlii. 12. A process as claimed in claim 11 wherein the Clostridium ljungdahlii strain is selected from Clostridium ljungdahlii PETC, Clostridium ljungdahlii ERI2, Clostridium ljungdahlii C01, Clostridium ljungdahlii 0-52.
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