Methods and systems of enhanced carbon dioxide recovery

摘要

Methods and systems of enhanced carbon dioxide recovery from an inlet gas stream are provided, by introducing the gas stream to one or more membrane-based separation units to produce a permeate byproduct gas stream having increased concentration of carbon dioxide compared to the inlet gas stream and then introducing the permeate byproduct gas stream to one or more pressure swing adsorption units or trains to enhance recovery of hydrocarbons, such as methane, lost in the byproduct stream and to produce a substantially pure carbon dioxide stream, while minimizing process compression and eliminating process heat for process regeneration. The methods introduced herein are for enhancing product recovery by enhancing carbon dioxide recovery from gas streams with pressures greater than atmospheric conditions. Further refinement to the methods would be the introduction of hydrogen sulfide polishing units within the process to produce product that meets or exceeds sales quality specifications.

主权项

1. A method of enhanced carbon dioxide recovery from an inlet gas stream, the method comprising the steps of:
introducing an inlet gas stream, having carbon dioxide and hydrogen sulfide, to one or more hydrogen sulfide polishing units; operating the one or more hydrogen sulfide polishing units to produce an outlet gas stream with a reduced concentration of hydrogen sulfide compared to the inlet gas stream; introducing the outlet gas stream to one or more membrane-based separation units; operating the one or more membrane-based separation units to produce a permeate byproduct gas stream having increased concentration of carbon dioxide compared to the carbon dioxide concentration in the outlet gas stream; directly introducing the permeate byproduct gas stream to one or more pressure swing adsorption units without compression; and operating the one or more pressure swing adsorption units to produce a substantially pure carbon dioxide stream comprising substantially all of the carbon dioxide from the permeate byproduct gas stream in a single pass.