A method of transporting CO.sub.2 includes combining gaseous CO.sub.2 produced at a point of origin with a solid metal oxide salt and/or a solid metal hydroxide salt at the point of origin to form a solid metal carbonate salt that includes the CO.sub.2 from the point of origin and the metal from the metal oxide salt or the metal from the metal hydroxide salt. The method includes transporting the solid metal carbonate salt from the point of origin to a destination. The method also includes calcining the solid metal carbonate salt at the destination to generate gascous CO.sub.2 and to re-generate the solid metal oxide salt and/or the solid metal hydroxide salt.

A method for producing a purified gas containing carbon dioxide gas, comprising: a first concentration step in which an intermediate gas having a higher concentration of carbon dioxide gas than a target gas is produced by vacuum regeneration pressure swing adsorption using a first adsorption tower that adsorbs carbon dioxide gas from the target gas containing carbon dioxide gas; and a second concentration step in which the purified gas having an even higher concentration of carbon dioxide gas than the intermediate gas is produced by vacuum regeneration pressure swing adsorption using a second adsorption tower that adsorbs carbon dioxide gas from the intermediate gas or membrane separation.

A method for producing a purified gas containing carbon dioxide gas, comprising: a first concentration step in which an intermediate gas having a higher concentration of carbon dioxide gas than a target gas is produced by vacuum regeneration pressure swing adsorption using a first adsorption tower that adsorbs carbon dioxide gas from the target gas containing carbon dioxide gas; and a second concentration step in which the purified gas having an even higher concentration of carbon dioxide gas than the intermediate gas is produced by vacuum regeneration pressure swing adsorption using a second adsorption tower that adsorbs carbon dioxide gas from the intermediate gas or membrane separation.

The present invention relates to the field of production of granulated solid carbon dioxide (CO2), in particular, to a method for production of granulated solid carbon dioxide, comprising the formation of solid CO2, compression of solid CO2 to provide a conversion of at least a portion of solid CO2 to a state of highly viscous fluid CO2 and stopping the compression to produce granulated solid CO2. Also provided is granulated CO2 produced by this method, and an apparatus for producing granulated CO2.

The present invention relates to the field of production of granulated solid carbon dioxide (CO2), in particular, to a method for production of granulated solid carbon dioxide, comprising the formation of solid CO2, compression of solid CO2 to provide a conversion of at least a portion of solid CO2 to a state of highly viscous fluid CO2 and stopping the compression to produce granulated solid CO2. Also provided is granulated CO2 produced by this method, and an apparatus for producing granulated CO2.

A system and method for power generation and CO.sub.2 sequestration include a fuel cell system configured to generate power using natural gas (NG), a container configured to store liquid natural gas (LNG), and a fluid processor configured to convert LNG received from the container into NG and to convert exhaust output from the fuel cell system to dry ice by transferring heat between and the LNG and the exhaust.

A gas separation membrane has a gas separation layer containing a poly(benzoxazole-imide) compound in which the poly(benzoxazole-imide) compound having structural units represented by General formulae (I) and (II), or structural units represented by General formulae (I), (II) and (III) satisfies a specific molar quantity condition.

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In the formulae, X and Y each represent a single bond or a specific divalent linking group; L represents a specific divalent linking group including a phenylene group; and R represents a specific group. A gas separation module and a gas separation method use the gas separation membrane. A gas separation apparatus includes the gas separation module.

A gas separation membrane has a gas separation layer containing a cellulose resin, and an organopolysiloxane compound layer disposed on the gas separation layer in which Si ratio of the organopolysiloxane compound layer after immersion in chloroform to the organopolysiloxane compound layer before immersion in chloroform, the Si ratio being calculated by Mathematical expression (I), is 0.6 to 1.0.

Si ratio=(SiK X-ray intensity after immersion in chloroform)/(SiK X-ray intensity before immersion in chloroform)Mathematical expression (I)

A nozzle for converting or separating a liquid/gaseous CO.sub.2 into a dry ice includes a housing, a spherical chamber configured in the housing, and a first tangential inlet configured on the housing to tangentially inject the liquid CO.sub.2 into the spherical chamber. The tangential injection creates a helical flow of the liquid CO.sub.2 inside the spherical chamber causing flocculation at a desired pressure and temperature to ensure optimum phase transformation to create the dry ice. Further, a second tangential inlet is configured adjacent to the first tangential inlet to transfer a first secondary material into the spherical chamber to achieve highest possible degree of mixing, and resulting in the highest possible utilization of sub-cooling potential. Furthermore, one or more inlets are configured in the housing to receive a second secondary material to support expansion-based flocculation by thermally insulating the housing to achieve precooling of the spherical chamber.

CCU technology is being researched and developed by companies and institutions around the world, but there are many issues to be addressed, such as the cost of recovering carbon dioxide gas, how to convert it into valuable resources, conversion costs, facility costs, and whether it is commercially viable. This invention proposes a high-value-added CCU system that has potential for future development and can also be used for air conditioning supply.

The system consists of a wet type TSA carbon dioxide gas separation and concentration unit, a saturated vapor generator, a gas cooler, a gas compressor, a dehumidification unit, a gas liquefaction unit and refrigerator, a gas purification tank, and a dry ice production unit. The system is highly energy-efficient, compact, and air-conditionable, using carbon dioxide in the air as the gas source, by using the unliquefied gas from the post-purification process to purge the aforementioned separation and concentration equipment and recovering the uncoagulated gas from the dry ice production equipment.