A device for separating a gas mixture containing at least 35 mol % carbon dioxide and also at least one gas lighter than carbon dioxide, comprising a first phase separator configured to receive a first partially condensed flow from an exchange line; a first phase separator configured to separate the gas phase from the liquid phase; a cooling means configured to receive the gas phase from the first phase separator and cool said gas phase to form a second partially condensed flow. The resulting liquid phase is then sent to a first valve and is expanded to a lower pressure that is at most 300 mbar lower in order to form a first expanded liquid, which is then mixed with a second liquid originating from the second phase separator in a mixing means that is located upstream of a third valve.

A process to produce at least carbon dioxide and carbon monoxide from a feed gas containing carbon dioxide, hydrogen and carbon monoxide; comprises separating at least part of the carbon dioxide from the compressed feed gas by partial condensation and/or distillation producing a carbon dioxide product and a carbon dioxide depleted stream, treating the carbon dioxide depleted stream in a treatment unit to produce a feed stream containing carbon monoxide and hydrogen, less rich in carbon dioxide than the carbon dioxide depleted stream and feeding at least part of the feed stream containing carbon monoxide and hydrogen to a separation unit operating at cryogenic temperatures to produce a carbon monoxide product.

A system for removing carbon dioxide from anode exhaust gas that has been compressed to form pressurized anode exhaust vapor includes a feed/effluent heat exchanger configured to cool the anode exhaust vapor to a first predetermined temperature and partially condense carbon dioxide in the anode exhaust vapor; a first vapor-liquid separator configured to receive an output of the feed/effluent heat exchanger and separate liquid carbon dioxide from uncondensed anode exhaust vapor; a feed/refrigerant heat exchanger configured to receive the uncondensed anode exhaust vapor from the first vapor-liquid separator, cool the uncondensed anode exhaust vapor to a second predetermined temperature, and condense carbon dioxide in the uncondensed anode exhaust vapor; a second vapor-liquid separator configured to receive an output of the feed/refrigerant heat exchanger and separate liquid carbon dioxide to form hydrogen rich, uncondensed anode exhaust vapor.

In a process for separating a mixture containing hydrogen and carbon dioxide, the following steps are present: a) cooling of the mixture in a heat exchanger by sending the mixture to the heat exchanger, resulting in the partial condensation of the mixture into a liquid phase enriched in carbon dioxide and a gas phase depleted in carbon dioxide, a gaseous fluid which is heated in the heat exchanger by indirect heat exchange, b) separating the liquid phase from the gas phase in a separator vessel, c) heating of the gas phase originating from at least one of the separator vessels in the heat exchanger, d) sending of the at least one heated part from step c) to a membrane separation unit, generating a residue depleted in hydrogen and carbon dioxide and e) expansion of the at least one residue in a turbine producing an expanded fluid, f) the expanded fluid constituting the gaseous fluid of step a) which is heated in the heat exchanger by indirect heat exchange.

In a process for separating a mixture containing hydrogen and carbon dioxide, the mixture is compressed to form a compressed mixture, the compressed mixture is separated by partial condensation and/or distillation generating a first CO2-depleted stream, the first CO2-depleted stream is separated by permeation through a membrane system to form a residue of the membrane system which is depleted in hydrogen and carbon dioxide and a portion of the residue is recycled, after expansion, to the compressor to be compressed therein.

A carbon dioxide-rich mixture is cooled in a first brazed aluminum plate-fin heat exchanger, at least one fluid derived from the cooled mixture is sent to a purification step having a distillation step and/or at least two successive partial condensation steps, the purification step produces a carbon dioxide-depleted gas which heats up again in the first exchanger, the purification step produces a carbon-dioxide rich liquid which is expanded, then sent to a second heat exchanger where it is heated by means of a fluid of the method, the exchanger carrying out an indirect heat exchange only between the carbon dioxide-rich liquid and the fluid of the method, the carbon dioxide-rich liquid at least partially vaporizes in the second exchanger and the vaporized gas formed heats up again in the first exchanger to form a carbon dioxide-rich gas which can be the end product of the method.

A method for separating a vapor from a carrier gas is disclosed. A hydrocyclone is provided with one or more nozzles on the wall of the hydrocyclone. A cryogenic liquid is provided to the tangential feed inlet at a velocity that induces a tangential flow and a cyclone vortex in the hydrocyclone. The carrier gas is injected into the hydrocyclone through the one or more nozzles. The vapor dissolves, condenses, desublimates, or a combination thereof, forming a vapor-depleted carrier gas and a vapor-enriched cryogenic liquid. The vapor-depleted gas is drawn through the vortex finder while the vapor-enriched cryogenic liquid is drawn through the apex nozzle outlet. In this manner, the vapor is removed from the carrier gas.

A heat exchanger for separating a vapor component from a carrier gas is disclosed. The carrier gas is cooled in an outer chamber, causing a vapor component of the carrier gas to desublimate or condense onto an outer surface of an inner chamber, forming a solid product. A coolant is passed through the inner chamber to cool the carrier gas of the outer chamber. A means for causing the inner chamber to flex is provided, causing the solid product to fall from the outer surface of the inner chamber for collection. In this manner, the vapor component is separated from the carrier gas.

A hydrocyclone for separating a vapor from a carrier gas is disclosed. The hydrocyclone comprises one or more nozzles. A cryogenic liquid is injected to a tangential feed inlet at a velocity that induces a tangential flow and a cyclone vortex in the hydrocyclone. The carrier gas is injected into the cryogenic liquid, causing the vapor to dissolve, condense, desublimate, or a combination thereof, forming a vapor-depleted carrier gas and a vapor-enriched cryogenic liquid. The vapor-depleted carrier gas is drawn through a vortex finder and the vapor-enriched cryogenic liquid is drawn through an apex nozzle outlet. In this manner, the vapor is removed from the carrier gas.

An air-sparged hydrocyclone for separating a vapor from a carrier gas is disclosed. The cyclone comprises a porous sparger covered by an outer gas plenum. A cryogenic liquid is injected to a tangential feed inlet at a velocity that induces a tangential flow and a cyclone vortex in the air-sparged hydrocyclone. The carrier gas is injected into the cyclone through the porous sparger. The vapor dissolves, condenses, desublimates, or a combination thereof, forming a vapor-depleted carrier gas and a vapor-enriched cryogenic liquid. The vapor-depleted carrier gas is drawn through a vortex finder and the vapor-enriched cryogenic liquid is drawn through an apex nozzle outlet. In this manner, the vapor is removed from the carrier gas.