Abstract: A portion of the overhead vapor from a distillation column is used to heat a process stream. The temperature and flow rate of the stream out of a heat exchanger are controlled so that the vapor is condensed.

Abstract: A system includes an acid gas removal (AGR) system configured to remove an acid gas from an untreated syngas to generate a treated syngas, a hydrogen separation system configured to receive the treated syngas to generate a non-permeate and a permeate, and an expander configured to expand the non-permeate to generate a cooled non-permeate. The AGR system includes a solvent chiller configured to cool a solvent via heat exchange with the cooled non-permeate.

Abstract: A system and method are provided for recovering a re-usable grade of sulphur hexafluoride (SF6) from a potentially contaminated gas source. The system includes extraction vessels connected to the potentially contaminated gas source. A first cryogenic means reduces the temperature of the extraction vessel to a temperature below the phase transition of SF6 causing a pressure differential which causes the potentially contaminated gas to enter the extraction vessels. The SF6 turns to liquid and/or solid form in the extraction vessel. Non-condensed contaminant gas is evacuated from the extraction vessels. Recovery vessels are connected to the extraction vessel. A second cryogenic means is used to reduce the temperature of the recovery vessels. Raising the temperature of the extraction vessels creates a pressure differential which causes a re-usable grade of SF6 to enter the recovery vessels.

Abstract: The invention relates to a process for removing oxygen from liquid argon using a TSA (temperature swing adsorption) cyclical process that includes cooling an adsorbent bed to sustain argon in a liquid phase; supplying the adsorbent bed with a liquid argon feed that is contaminated with oxygen and purifying the liquid argon thereby producing an argon product with less oxygen contaminant than is in the initial liquid argon feed; draining the purified residual liquid argon product and sending purified argon out of the adsorbent bed. Regeneration of specially prepared adsorbent allows the adsorbent bed to warm up to temperatures that preclude the use of requiring either vacuum or evacuation of adsorbent from the bed.

Abstract: A device for automatically detecting and removing air from a gas mixture of an organic gas and air includes calculating a saturation pressure value based on a temperature of the gas mixture in a reservoir 1, and obtaining a pressure threshold value by adding a margin value to the saturation pressure value. When the pressure value inside the reservoir 1 is higher than the pressure threshold value, air is detected to be in the gas mixture. After this detection, a controller 5 pressurizes and introduces the gas mixture into a pressure container 2 to condense the organic gas in the gas mixture, thus producing a diluted gas mixture. Subsequently, the diluted gas mixture is introduced to a supply side of a membrane unit 3, the organic gas in the diluted gas mixture is recovered at a permeation side thereof, and a residual gas is discharged outside of the device.

Abstract: Proposed is a method for dehydrating a CO2 containing gas (1) by cooling the gas (1) and separating the condensed water from the gas (1), wherein the gas is contacted with liquid CO2 to condense water contained in the gas (1) and the condensate is separated from the remaining gas. Further, a device for dehydrating a CO2 containing gas is proposed, comprising a gas feeding system for feeding the gas which has to be dehydrated, wherein the device comprises a CO2 feeding system for feeding liquid CO2, a contacting device (C) for contacting the gas and the liquid CO2 for cooling the gas (1) to condense the water contained in the gas (1), and which comprises a first separator (4) for separating the condensate from the remaining gas.

Abstract: An integrated apparatus for separating a mixture of carbon dioxide and at least one other gas and for separating air by air distillation is provided. The apparatus includes a CO2 separation unit configured to separate the mixture, an air separation unit configured to separate air by cryogenic distillation, a water cooling tower that operates by direct contact, a line for sending water to the top of the tower, a line for sending at least one portion of the nitrogen-enriched gas stream to a lower level of the tower, a cooled water line for withdrawing cooled water from the tower and means for cooling the air upstream of the air separation unit, the cooled water line being connected to means for cooling the air upstream of the air separation unit and to the inlet and/or to the outlet of the unit for separating the gaseous mixture.

Abstract: A method for removing noxious, hazardous, toxic, mutagenic, and/or carcinogenic compounds and/or precursor compounds from a comingled gas, liquid and/or solid stream is described. In one embodiment, the method includes optionally passing the stream through an ambient temperature condenser followed by passing the stream through a spray venturi scrubber, a chilled condenser, a gas/solid separator, and a series of wet scrubbers to remove at least a portion of the compounds.

Abstract: A stripper heat integration system includes a first heat exchanger; a second heat exchanger; and a refrigerant loop comprising a refrigerant and configured for flow of the refrigerant therein. The refrigerant loop is in communication with the first heat exchanger and the second heat exchanger. The stripper heat integration system further includes a compressor located in the refrigeration loop, and configured to compress the refrigerant prior to the refrigerant entering the second heat exchanger. The first heat exchanger and the second heat exchanger are in fluid communication with a stripper, and the stripper heat integration system is configured for use with a carbon capture system, to reduce energy consumption of the carbon capture system.

Abstract: The present invention relates to a method for removing at least one contaminant from a gaseous stream substantially comprising carbon dioxide. More specifically said method includes the step of subjecting the gaseous stream to an absorption step in which the absorbent is liquid carbon dioxide.

Abstract: An argon purification system is provided which includes a cryogenic heat exchanger, a cryogenic distillation column. The cryogenic heat exchanger is configured to remove heat from a pre-treated argon waste stream to create a cold feed stream. The cryogenic distillation column includes packing, a reboiler, and an overhead condenser, as well as an upper portion and a lower portion and is configured to receive a liquid feed stream and to produce a bottoms argon product stream and a gas waste stream. The reboiler is positioned in the lower portion of the cryogenic distillation column and is configured to condense the cold feed stream to produce the liquid feed stream. The condenser is positioned in the upper portion of the cryogenic distillation column and is configured to heat the bottoms argon product stream such that the bottoms argon product stream evaporates to a purified vapor phase argon stream.

Abstract: A method for purifying an argon stream is provided. The method includes pretreating an argon waste stream to remove impurities to provide a pre-treated argon waste stream having argon, nitrogen, and hydrogen; cooling the argon waste stream to create a cold feed stream; and condensing the cold feed stream to create a liquid feed stream. The liquid feed stream is fed to the cryogenic distillation column to create a bottoms argon product stream and a gas waste stream. The bottoms argon product stream travels to an expansion device to provide a cooled bottoms argon product stream, which can optionally be combined with an argon lift stream downstream of the expansion device. The combined argon lift stream and cooled bottoms argon product stream are fed to the overhead condenser and vaporized to create a purified vapor phase argon stream.

Abstract: The present embodiments are directed towards the cooling of a solvent of a gas treatment system using a fluid flow from an air separation unit. In one embodiment, a system is provided that includes an air separation unit. The air separation unit has an air inlet configured to receive an air flow, an oxygen outlet configured to output an oxygen flow, a nitrogen outlet configured to output a nitrogen flow and a cooling system configured to cool the air flow to enable separation of the air flow into the oxygen flow and the nitrogen flow, wherein the cooling system is configured to cool a first solvent of a first gas treatment system.

Abstract: Process for producing hydrogen from a gas mixture comprising hydrogen, CO2, CO, CH4 and water, employing a CO2 PSA unit, a cryogenic unit and an H2 PSA unit, in which process: a) said gas mixture is introduced into the CO2 PSA unit, producing a CO2-enriched fraction and CO2-depleted fraction; b) CO2-enriched fraction is introduced into the cryogenic unit, producing a CO2-enriched fraction and an H2-enriched fraction; c) the H2-enriched fraction is recycled upstream of the H2 PSA unit; and d) the CO2-depleted fraction coming from step b) is introduced into the H2 PSA unit, producing a hydrogen-enriched stream and a waste gas.

Abstract: A fossil-fuel-fired power plant, having a combustion device, a CO2 separation device, which is arranged downstream of the fossil-fuel-fired power plant, for removing CO2, and a CO2 compressor station, which is arranged downstream of the CO2 separation device and which has a number of compressor stages and coolers for intermediate cooling is provided. The coolers are connected to the CO2 separation device or the fossil-fuel-fired power plant by means of a condensate line in order to recover condensate. A method for carrying out the condensate recovery is also provided.

Abstract: Disclosed is a process for use with flue gas having a moisture content M. The flue gas is introduced to strong brine adapted to exothermically absorb moisture. Simultaneously, heat is withdrawn. This produces heat, water-enriched brine and a gas having a moisture concentration less than M. The strong brine can be recovered by distillation from enriched brine to produce water. The brine temperature throughout absorption can remain within 2° F. of a temperature T in the range 220° F.-300° F. The heat withdrawal can be associated with gas-liquid phase change of a working fluid. The terminus of the heat flow can be associated with gas-liquid phase change of the working fluid. The working fluid can: as liquid, flow only by gravity, convection or wicking; and, as gas, flow only by diffusion or convection. The heat flow can drive a boiler producing steam. M can be greater than 15 wt. % water.

Abstract: The present invention is a process for removing carbon dioxide from a compressed gas stream including cooling the compressed gas in a first heat exchanger, introducing the cooled gas into a de-sublimating heat exchanger, thereby producing a first solid carbon dioxide stream and a first carbon dioxide poor gas stream, expanding the carbon dioxide poor gas stream, thereby producing a second solid carbon dioxide stream and a second carbon dioxide poor gas stream, combining the first solid carbon dioxide stream and the second solid carbon dioxide stream, thereby producing a combined solid carbon dioxide stream, and indirectly exchanging heat between the combined solid carbon dioxide stream and the compressed gas in the first heat exchanger.

Abstract: Disclosed are methods of obtaining carbon dioxide from a CO2-containing gas mixture. The methods combine the benefits of gas membrane separation with cryogenic temperatures.

Abstract: A regenerative carbon dioxide removal system (38) is provided onboard the container (10) through which air from within the cargo box (12) may be circulated for removing at least a portion of the carbon dioxide present in the air. The regenerative carbon dioxide removal system (38) includes a scrubber module (40) containing a carbon dioxide absorbent material (42), and an actuator (50) for moving the scrubber module (40) to pass the carbon dioxide absorbent material (42) alternately between a first flow of air (32) to be cleaned drawn by the evaporator fan (30) from within the cargo box (12), and a second flow of air (44) drawn from an environment outside the cargo box for regenerating the carbon dioxide adsorbent material (42) by removing collected carbon dioxide from the carbon dioxide adsorbent material (42).

Abstract: The present invention relates to a flue gas treatment system for removing CO2 from a flue gas stream wherein the system includes a flue gas compressor, at least one flue gas adsorption drier, a refrigeration system and a stripper column allowing distillation. Also a method for condensation of carbon dioxide (CO2) in a flue gas stream including a step of separation by distillation of the condensed CO2 is provided by the invention.

Abstract: The invention relates to a cryogenic distillation apparatus for a gas mixture, including a purification apparatus for purifying a gas mixture in a system with a plurality of adsorbant bottles, a column system, a capacity, means for feeding a cryogenic liquid to the capacity, means for feeding a vaporized liquid from the capacity to a column of the system, a vaporizer in the capacity for vaporizing the contained liquid; means for feeding a calorigenic gas to the vaporizer, and means for drawing a liquid from the capacity.

Abstract: A method is described for separating off trace components from a fraction (1) containing at least nitrogen and helium, wherein this fraction is partially condensed (E) before enrichment of the helium. The partially condensed fraction (2) is fed at least in part to at least one separation column (T) and separated therein into a helium-rich gas fraction (6) and a nitrogen-rich liquid fraction which also contains the unwanted trace components (5).

Abstract: An off gas extraction system cleans common sources of off gas, such as storage tanks and polluted soils. Off gas is extracted, followed by compression and condensation. Compression and condensation produce an off gas that can be reintroduced as a treated gas into the off gas source. Alternatively, a regenerative absorber cleans the treated gas by adsorbing residual chemical vapor and concentrates the removed chemical vapors and reprocesses them. If the treated gas is not reintroduced into the off gas source, conventional scrubbers may used on the back end of the system to produce a final exhaust as prescribed by environmental regulation. Methods of accomplishing the same are similarly provided, including novel methods for degassing storage tanks and treating polluted soils to meet current environmental regulations, as well as green technology and sustainability initiatives.

Abstract: A process comprising receiving an ethane-rich stream comprising at least about 70 molar percent ethane, conditioning the ethane-rich stream to a temperature such that the ethane-rich stream has a vapor pressure similar to the vapor pressure of conventional liquefied natural gas (LNG), and transporting the conditioned ethane-rich stream. Included is a plurality of processing equipment configured to implement a process comprising receiving an ethane-rich stream, adjusting a temperature, a pressure, or both of the ethane-rich stream such that the ethane-rich stream has a temperature from about ?160° F. to about 0° F. and a pressure from about 14.7 pounds per square inch absolute (psia) to about 100 psia, and removing substantially all of any vapor fraction from the ethane-rich stream.

Abstract: A protocol for removing condensables from a fluid. The fluid, as an example an acid gas stream captured for EOR or CCS purposes, is initially treated to condense liquids with removal to form a gas stream. The latter is then compressed and cooled. At least a portion of this is then expanded, to form a cooled low pressure stream, and mixed with the initial fluid stream to augment cooling and condensation of condensable components.

Abstract: Improvements in tubes, which increase the heat exchange capacity of tubular heat exchangers using the tubes, are described. These improvements involve the use of one or more external surface enhancements, optionally combined with an internal enhancement and/or differing tube geometries. These improvements apply, for example, to internal condensers, including those in which the tube bundles are oriented vertically, in vapor-liquid contacting apparatuses such as distillation columns.

Abstract: The invention relates to cryogenic engineering. The inventive device for liquefying and separating gas and for releasing one or more gases from a mixture thereof, comprises, in series axially positioned, a prechamber (1) with gas flow whirling means (2) arranged therein, a subsonic or supersonic nozzle (3) with a working segment (4), which is abutted thereto and to which liquid phase extracting means (5) is connected, and a subsonic diffuser (7) or the combination of a supersonic (6) and the subsonic diffuser (7). The length of the working segment (4) is selected according to a condition of forming condensate drops with a size greater than 0.5 mkm and of drifting them, by centrifugal forces, from the axial area of the working segment to the walls of the drop extracting means. The device is provided with an additional nozzle (8) arranged in the prechamber. The invention makes it possible to increase the separation efficiency.

Abstract: A method for removing condensable components from a fluid containing condensable components. The method involves optimizing the temperature of an initial feed stream including the condensable components through heat exchange and cooling to condense liquids there from. The liquids are removed to form a gas stream which is then compressed and after-cooled to form a high pressure stream. A portion of the high pressure stream is expanded to form a cooled low pressure stream which is mixed with the initial feed stream to augment cooling and condensation of condensable components in the initial feed stream.

Abstract: A process is described for producing a clean gas, which is provided, in particular, for testing a pressurized construction component (100) for leaks, which process includes the steps of providing a liquefied gas mixture (1) which contains the clean gas (2) and at least one foreign gas (3) in a gas separation unit (20), enriching the clean gas (2), wherein the at least one foreign gas (3) is transferred to a surface region of the liquefied gas mixture (1), and taking off the enriched clean gas (2), wherein the enriched clean gas (2) flows out of a volume region of the gas separation unit (20) via a guide unit (22), and wherein a foreign gas barrier (23) is formed at the guide unit (22), using which the foreign gas (3) in the liquefied gas mixture (1) is passed out from an opening in the guide unit (22). A device for producing a clean gas, a noble-gas-free gas composition and a process for testing a construction component pressurized with a test gas for leaks are also described.

Abstract: Disclosed are methods of obtaining carbon dioxide from a CO2-containing gas mixture. The methods combine the benefits of gas membrane separation with cryogenic temperatures.

Abstract: An energy-efficient method of recovering carbon dioxide (CO2) in a liquid state from a high-pressure gas stream is provided. The method includes cooling, condensing, and/or separating CO2 from a high-pressure gas stream and further purifying the resulting liquid CO2 in a purification zone to thereby provide a purified CO2 product. The purified liquid CO2 product may then be pumped to a higher pressure for further utilization and/or sequestration for industrial or environmental purposes.

Abstract: In one embodiment, a power plant is provided. The power plant includes a power generation system configured to produce an exhaust; a CO2 separation system configured to receive the exhaust and configured to remove CO2 therefrom, the CO2 separation system being configured to produce a CO2 stream; a heat recovery steam generator (HRSG) operatively coupled to the power generation system and the CO2 separation system; and a CO2 compression system configured to receive the CO2 stream and configured to produce a CO2 product stream.

Abstract: The present invention provides a gas pressurized separation system to strip a product gas from a liquid stream and yield a high pressure gaseous effluent containing the product gas. The system comprises a gas pressurized stripping apparatus, such as a column, with at least one first inlet allowing flow of one or more liquid streams in a first direction and at least one second inlet allowing flow of one or more high pressure gas streams in a second direction, to strip the product gas into the high pressure gas stream and yield through at least one outlet a high pressure gaseous effluent containing the product gas; and two or more heat supplying apparatuses provided at different locations along the column. Processes for separating a product gas from a gaseous mixture to yield a high pressure gaseous effluent containing the product gas, utilize the gas pressurized separation system described above.

Abstract: A system and method for improved cryogenic cooling of process streams in polysilicon manufacturing is provided. The disclosed system and method provides for the cryogenic cooling of a silane and hydrogen process stream during the manufacture of polysilicon with concurrent recovery of refrigeration capacity from the vaporized nitrogen as well as the recovery of refrigeration capacity from the cold hydrogen stream. The improved cryogenic cooling system and method reduces the overall consumption of liquid nitrogen without sacrificing cooling performance of the cryogenic cooling of the silane and hydrogen process stream.

Abstract: A system includes an acid gas removal (AGR) system configured to remove an acid gas from an untreated syngas to generate a treated syngas, a hydrogen separation system configured to receive the treated syngas to generate a non-permeate and a permeate, and an expander configured to expand the non-permeate to generate a cooled non-permeate. The AGR system includes a solvent chiller configured to cool a solvent via heat exchange with the cooled non-permeate.

Abstract: A system and method for improved cryogenic cooling of process gases is provided. The disclosed system and method provides for the cryogenic cooling of a silane and hydrogen gas process stream during the manufacture of polysilicon with concurrent recovery of refrigeration capacity from the vaporized nitrogen as well as the recovery of refrigeration capacity from the cold hydrogen gas stream. The improved cryogenic cooling system and method reduces the overall consumption of liquid nitrogen without sacrificing cooling performance of the cryogenic cooling of the silane and hydrogen gas process stream.

Abstract: The present invention relates generally to the field of emissions control and, in particular to a new and useful method and/or system by which to control, treat and/or mitigate various liquid-based acidic compounds that are produced during oxy-combustion (e.g., during a compression step and/or cooling step) from various gaseous acid compounds and/or gaseous acid precursor compounds (e.g., SOx, NOx, etc.). In one embodiment, the present invention relates to a method and/or system by which such one or more liquid-based acid compounds are recycled into the flue gases and/or into one or more of the emissions control and/or flue gas treatment equipment of an oxy-combustion power generation system.

Abstract: Disclosed are methods of obtaining carbon dioxide from a CO2-containing gas mixture. The methods combine the benefits of gas membrane separation with cryogenic temperatures.

Abstract: The present invention relates to a process for simplified separation of a reaction product (P) from reaction gas mixtures by means of partial condensation of the reaction gas mixture consisting of the reaction product (P), at least one high boiler (H) and at least one low boiler (L).

Abstract: Provided are a front impurity-removing device with a compressor for compression of the exhaust gas from an oxyfuel combustion device to make impurities in the exhaust gas water-soluble and with a cooler for cooling of the exhaust gas compressed by the compressor to condense moisture in the exhaust gas to discharge drainage with the impurities dissolved, and at least a single rear impurity-removing device with a rear compressor for compression of the exhaust gas to a pressure higher than that of the compressor and a rear cooler to discharge drainage.

Abstract: Various embodiments of the invention include systems and methods for cooling a dynamoelectric machine. In some embodiments, a system is disclosed including: at least one of a nitrogen separation unit (NSU) or an air separation unit (ASU) for extracting nitrogen from an inlet air source; a nitrogen expander fluidly connected with the at least one of the NSU or the ASU, the nitrogen expander for expanding the extracted nitrogen; and a dynamoelectric machine fluidly connected with the nitrogen expander, the dynamoelectric machine configured to receive the expanded nitrogen for cooling the dynamoelectric machine.

Abstract: A clothes treating apparatus includes a drum configured to accommodate therein an object to be dried, an air suction device configured to form a flow path of air introduced into the drum, an air exhaustion device configured to form a flow path of air exhausted from the drum, a condenser disposed to heat air sucked into the drum through the air suction device, an evaporator disposed to cool air exhausted from the drum the air exhaustion device, and a compressor and an expander configured to constitute a heat pump together with the condenser and the evaporator. The method includes a temperature detection step of detecting a temperature change of air passing through the condenser or the air suction device, and a determination step of determining that refrigerant leakage has occurred when a temperature decrease amount measured in the temperature detection step is more than a predetermined level.

Abstract: There are provided methods capable of easily and efficiently recovering and recycling ammonia from exhaust gas containing a small amount of ammonia, the exhaust gas being exhausted from a production process of a gallium nitride compound semiconductor. The method of recovering ammonia includes filtering exhaust gas containing ammonia, hydrogen, nitrogen, and a solid compound with a filter to remove the solid compound from the exhaust gas; pressurizing and cooling the filtered exhaust gas with a heat pump to liquefy ammonia contained in the filtered exhaust gas; and separating liquefied ammonia from hydrogen and nitrogen to recover liquefied ammonia. The method of recycling ammonia includes evaporating recovered liquid ammonia; mixing the evaporated ammonia with another crude ammonia to obtain mixed gas; purifying the mixed gas; and supplying the purified gas to the production process of a gallium nitride compound semiconductor.

Abstract: A process for the production of ammonia synthesis gas and pure methane by cryogenic separation of a feed gas containing at least 75% hydrogen as well as methane and nitrogen, the feed gas is cooled in a heat exchanger and partially condensed, the partially condensed feed is sent to a phase separator, the gas from the phase separator is sent to a nitrogen wash column, liquid nitrogen is sent to the top of the nitrogen wash column and ammonia synthesis gas is removed from the top of the nitrogen wash column, the liquid from the phase separator is expanded and sent to a separation column, a nitrogen enriched gas stream is removed from the top of the column and a nitrogen depleted liquid stream rich in methane is removed from the bottom of the column and the nitrogen depleted liquid stream rich in methane is vaporized to form a pure methane product.

Abstract: A method for drying a wet CO2 rich gas stream from an oxy-combustion process that includes: compressing the wet CO2 rich gas stream to a drying process operating pressure, cooling the wet CO2 rich gas stream in at least one cooler, alternately drying the wet CO2 rich gas stream in at least one dryer which contains at least one desiccant bed and regenerating the desiccant bed by conducting a heated regenerating gas through the dryer in opposite direction to the flow direction of the wet CO2 rich gas stream, separating the dried CO2 rich gas stream in a purification process to a purified CO2 gas stream and a waste gas stream rich in nitrogen and oxygen, whereby the waste gas stream rich in nitrogen and oxygen is used as regenerating gas, and subsequently to the regeneration the dryer is purged at least once by a pressurized CO2 rich gas stream conducted from the compressor, and whereby the dryer is charged up to the drying process operating pressure with a pressurized CO2 rich gas stream conducted from the comp

Abstract: The invention relates to a method for compressing at least two gas streams by means of a single compressor that does not support a fluctuation in flow rate and/or pressure above a critical percentage, said method being characterized in that at least one of the gas streams is fed into a buffer space before being fed into the single compressor.

Abstract: A method for separating carbon dioxide (CO2) from a gas stream is provided. The method includes cooling the gas stream in a cooling stage to form a cooled gas stream and cooling the cooled gas stream in a converging-diverging nozzle to form one or both of solid CO2 and liquid CO2. The method further includes separating at least a portion of one or both of solid CO2 and liquid CO2 from the cooled gas stream in the converging-diverging nozzle to form a CO2-rich stream and a CO2-lean gas stream. The method further includes expanding the CO2-lean gas stream in an expander downstream of the converging-diverging nozzle to form a cooled CO2-lean gas stream and circulating at least a portion of the cooled CO2-lean gas stream to the cooling stage for cooling the gas stream. Systems for separating carbon dioxide (CO2) from a CO2 stream are also provided.

Abstract: Ethane is separated from a carbon dioxide-containing feed gas in a demethanizer that receives a rich subcooled reflux stream at very low temperature. Freezing of carbon dioxide is prevented by feeding a temperature-controlled vapor portion of the feed gas to the column, wherein the temperature of the vapor portion is adjusted by routing a portion of the expander discharge through a heat exchanger in response to the tray temperature in the demethanizer. Thus, high separation efficiency is achieved at reduced, or even eliminated carbon dioxide freezing.

Abstract: A process and system for recovering valuable by-products (e.g., hydrogen) from refinery gas streams. For hydrogen-only recovery, the invention comprises a partial condensation step to upgrade the refinery fuel gas to a minimum of 60% hydrogen, which is further purified in a pressure swing adsorption process. When configured to recover hydrogen, methane-rich gas and raw LPG (methane depleted gas containing C2 hydrocarbons and heavier), the invention comprises two partial condensation steps where the feed is cooled in the first step to allow separation of ethane and heavier hydrocarbons, and the resulting vapor is cooled to a lower temperature in a second step for hydrogen recovery.

Abstract: In one embodiment, a carbon dioxide recovery apparatus includes a heat exchanger which heats a first rich liquid, a flow divider which divides the first rich liquid heated by the heat exchanger into a second rich liquid and a third rich liquid, a first release device which heats the second rich liquid and discharges a first semi-lean liquid, a second release device which heats the third rich liquid and discharges a second semi-lean liquid, and a regeneration tower which heats the first and second semi-lean liquids to generate a lean liquid. The first release device heats the second rich liquid, using the lean liquid. The second release device heats the third rich liquid, using a carbon dioxide-containing steam discharged at the regeneration tower. The heat exchanger heats the first rich liquid, using the lean liquid which has passed through the first release device.