Acid gas management in liquid fuel production process

摘要

A process and method for producing liquid fuel product from hydrogen and carbon monoxide containing streams produced by gasifying solid carbonaceous feedstock and steam reforming of light fossil fuels. The gasifier syngas is treated to preferentially remove at least 99% of sulfur containing impurities and less than 50% of the CO2 to produce a treated gasifier syngas and a CO2 enriched gas. The treated gasifier syngas and the light fossil fuel conversion unit product gas are combined to form a mixed syngas that is converted into a liquid fuel product. The CO2 enriched gas is used in the gasification unit.

主权项

1. A method for liquid production, comprising:
a) converting a solid carbonaceous material in a gasification unit to form a gasifier syngas; b) passing the gasifier syngas to a gas conditioning unit, and treating the gasifier syngas therein, where said gas conditioning unit contains an acid gas removal unit designed to remove less than 50% of CO2 in gasifier syngas; c) forming at least a treated gasifier syngas stream containing at least 50% of CO2 in the gasifier syngas, a CO2-enriched gas stream, and a sulfur-enriched stream; d) utilizing at least 90% of the CO2-enriched gas stream in the formation of the gasifier syngas; e) converting a light fossil fuel in a light fossil fuel conversion unit to form a H2-rich syngas comprising H2 and CO at a H2/CO mole ratio of at least 2:1; f) combining treated gasifier syngas and H2-rich syngas to form a mixed syngas having a H2/CO ratio greater than that of treated gasifier syngas stream; g) converting the mixed syngas to form a liquid fuel product and 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 h) reacting up to 100% of the byproduct stream in the light fossil fuel conversion unit to facilitate formation of the H2-rich syngas.