What is provided is a carbon dioxide treatment device having high energy efficiency for recovering and reducing carbon dioxide, and a method of producing a carbon compound using the carbon dioxide treatment device. In a carbon dioxide treatment device (100) including a recovery device (1) that recovers carbon dioxide, an electrochemical reaction device (2) that electrochemically reduces carbon dioxide recovered by the recovery device (1), and a homologation reaction device (4) that increases the number of carbons by multimerizing ethylene generated when carbon dioxide is reduced in the electrochemical reaction device (2), and in an absorption unit (12) of the recovery device (1), carbon dioxide gas is absorbed into an absorption liquid (A1), an absorption liquid (A2) that has absorbed carbon dioxide is heated in a discharge unit (13), and a carbon dioxide gas (G3) is discharged, and heat generated in a multimerization reaction in a homologation reaction device (4) is used to heat the absorption liquid (A2) in the discharge unit (13).

A nitrous oxide purification method includes a step of performing gas separation by introducing a mixed gas containing nitrous oxide into a gas separation membrane including a polymer material to cause nitrous oxide to selectively permeate the gas separation membrane.

A hybrid post-combustion carbon dioxide capture system for capturing carbon dioxide from a flue gas includes a compressor adapted to produce a compressed flue gas stream, a membrane-based carbon dioxide separation unit configured to receive a first portion of the compressed flue gas stream from the compressor, and an aqueous-based carbon dioxide capture unit configured to receive a second portion of the compressed flue gas stream from the compressor whereby the compressed flue gas stream is processed in parallel by the membrane-based carbon dioxide separation unit and the aqueous-based carbon dioxide capture unit.

What is provided is a carbon dioxide treatment device having high energy efficiency for recovering and reducing carbon dioxide, and a method of producing a carbon compound using the carbon dioxide treatment device. In a carbon dioxide treatment device (100) including a recovery device (1) that recovers carbon dioxide, an electrochemical reaction device (2) that electrochemically reduces carbon dioxide recovered by the recovery device (1), and a homologation reaction device (4) that increases the number of carbons by multimerizing ethylene generated when carbon dioxide is reduced in the electrochemical reaction device (2), and in an absorption unit (12) of the recovery device (1), carbon dioxide gas is absorbed into an absorption liquid (A1), an absorption liquid (A2) that has absorbed carbon dioxide is heated in a discharge unit (13), and a carbon dioxide gas (G3) is discharged, and heat generated in a multimerization reaction in a homologation reaction device (4) is used to heat the absorption liquid (A2) in the discharge unit (13).

Process for the combined production of a mixture of hydrogen and nitrogen, and of carbon monoxide by cryogenic distillation and cryogenic scrubbing, wherein a methane-rich liquid is introduced at a first intermediate level of a scrubbing column as first scrubbing liquid and at least one nitrogen-rich liquid is introduced at a level higher than the first level of the scrubbing column as second scrubbing liquid and a mixture of hydrogen and nitrogen is drawn off as overhead gas from the scrubbing column.

The invention relates to a method for separating chlorine from a gaseous anode outlet stream mass flow of an electrochemical cell reactor. In a first aspect, the method makes use of an absorption step, wherein an anode outlet stream mass flow of the electrochemical cell reactor is exposed to an organic solvent being essentially immiscible with water for achieving an exergy-efficient separation of chlorine and hydrogen chloride. In a further aspect, the method makes use of absorption step, wherein the anode outlet stream mass flow is exposed to an ionic liquid, wherein the hydrogen chloride is dissolved in said ionic liquid, thereby forming a gas flow containing essentially chlorine and a solution mass flow comprising the ionic liquid and the hydrogen chloride. The hydrogen chloride is desorbed from the solution mass flow in a desorption step. In another aspect, the method makes use of a distillation step, wherein the anode outlet stream mass flow is separated at a static pressure of at least 2 bar for an exergy-efficient separation.

Recovering helium from a gaseous stream includes contacting an acid gas removal membrane with a gaseous stream to yield a permeate stream and a residual stream, removing a majority of the acid gas from the residual stream to yield a first acid gas stream and a helium depleted clean gas stream, removing a majority of the acid gas from the permeate stream to yield a second acid gas stream and a helium rich stream, and removing helium from the helium rich stream to yield a helium product stream and a helium depleted stream. A helium removal system for removing helium from a gaseous stream including hydrocarbon gas, acid gas, and helium includes a first processing zone including a first acid gas removal unit, a second processing zone including a second acid gas removal unit, a third processing zone, and a helium purification unit.

A system and method for providing inert gas to a protected space is disclosed. The system is onboard an aircraft that includes a pressurized cabin or cockpit space. The system includes an airflow path including an inlet and an outlet, and the inlet is in operative fluid communication with the pressurized cabin or cockpit space. A carbon dioxide separator is configured for separating carbon dioxide from air, and includes an inlet in operative fluid communication with the airflow path outlet, and a carbon dioxide outlet. The system also includes an inert gas flow path from the carbon dioxide outlet to the protected space.

Recovering helium from a gaseous stream includes contacting an acid gas removal membrane with a gaseous stream to yield a permeate stream and a residual stream, removing a majority of the acid gas from the residual stream to yield a first acid gas stream and a helium depleted clean gas stream, removing a majority of the acid gas from the permeate stream to yield a second acid gas stream and a helium rich stream, and removing helium from the helium rich stream to yield a helium product stream and a helium depleted stream. A helium removal system for removing helium from a gaseous stream including hydrocarbon gas, acid gas, and helium includes a first processing zone including a first acid gas removal unit, a second processing zone including a second acid gas removal unit, a third processing zone, and a helium purification unit.

Disclosed is an absorbing liquid for separating and capturing carbon dioxide from a carbon dioxide-containing gas, the absorbing liquid containing: at least one alkanolamine represented by formula (1) ##STR00001##
wherein R.sup.1 represents hydrogen or C.sub.1-4 alkyl, R.sup.2 and R.sup.3 are identical or different and each represent hydrogen or C.sub.1-3 alkyl, R.sup.1, R.sup.2, and R.sup.3 are not all hydrogen, and n is 1 or 2; a low-molecular-weight diol compound and/or glycerin; and water.