Patent ID: 11952270
Assignee: AIR LIQUIDE ADVANCED TECHNOLOGIES U.S. LLC
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A process for purifying a pressurized feed stream containing at least 30 mol % CO2 and at most 10 mol % helium, comprising the steps of: partially condensing the pressurized feed stream in a heat exchanger to obtain a helium-rich gas stream and a CO2-rich liquid stream; separating the helium-rich gas stream in a gas separation membrane-based separation unit to obtain a first permeate stream and a first residue stream; compressing the first permeate stream, or a fraction thereof, to obtain a compressed permeate stream; introducing at least a fraction of the compressed permeate stream into the heat exchanger at which the introduced at least one fraction of the compressed stream is partially condensed to produce a gaseous permeate stream and a liquid permeate stream; and purifying at least a fraction of the gaseous permeate stream to obtain a purified helium stream containing at least 70 mol % helium.