Process and system for converting biogas to liquid fuels

摘要

A method of producing a hydrocarbon fuel from a hydrocarbon-containing gas is disclosed and described. A hydrocarbon-containing gas is produced (10) containing from about 25% to about 50% carbon dioxide and can be reformed (12) with a steam gas to form a mixture of hydrogen, carbon monoxide and carbon dioxide. The reforming can be a composite dry-wet reforming or a tri-reforming step. The mixture of hydrogen, carbon monoxide and carbon dioxide can be at least partially converted (14) to a methanol product. The methanol product can be converted to the hydrocarbon fuel (18), optionally via UME synthesis (16). The method allows for effective fuel production with low catalyst fouling rates and for operation in an unmanned, self-contained unit at the source of the hydrocarbon-producing gas.

主权项

1. A method of producing a liquid hydrocarbon fuel, comprising:
obtaining a biogas comprising 50-95 vol % methane and 25-50 vol % carbon dioxide; in a first reactor, steam reforming the biogas with a steam gas to form a synthesis gas having a ratio of approximately 6:3:1 of hydrogen, carbon monoxide and carbon dioxide; in a second reactor, converting the synthesis gas, in the presence of a methanol-synthesis catalyst and a DME catalyst, at least partially to a mixture of methanol and dimethyl ether; and in a third reactor, converting the mixture of methanol and dimethyl ether, in the presence of a ZSM catalyst, to a gasoline mixture comprising aliphatic hydrocarbons and aromatic hydrocarbons.