Methods and systems for reducing greenhouse gas emissions, including producing a waste gas stream comprising form greater than 0 vol % to less than 20 vol %, inclusive, carbon dioxide, pre-concentrating the waste gas stream to increase a concentration of carbon dioxide, producing a concentrated byproduct stream comprising more than 40 vol %, dissolving carbon dioxide contained in the concentrated byproduct stream in water, producing a dissolved byproduct stream and an undissolved byproduct stream, injecting the dissolved byproduct stream or a portion thereof into a reservoir containing mafic rock, and allowing components of the dissolved byproduct stream to react in situ with components of the mafic rock to precipitate and store components of the byproduct stream in the reservoir.

The present invention relates to the production of granulated solid carbon dioxide mainly for the purpose of cleaning surfaces of parts of various industrial equipment from operational and process surface contaminants and for the purpose of cooling various objects. Provided herein methods, devices and a system for compacting the solid carbon dioxide particles produced by expanding liquid carbon dioxide, wherein the mechanical energy obtained by converting the pressure energy of the compressed gaseous carbon dioxide produced by said expanding of said liquid carbon dioxide is used for compacting.

The present invention relates to the production of granulated solid carbon dioxide mainly for the purpose of cleaning surfaces of parts of various industrial equipment from operational and process surface contaminants and for the purpose of cooling various objects. Provided herein methods, devices and a system for compacting the solid carbon dioxide particles produced by expanding liquid carbon dioxide, wherein the mechanical energy obtained by converting the pressure energy of the compressed gaseous carbon dioxide produced by said expanding of said liquid carbon dioxide is used for compacting.

A process for obtaining carbon dioxide from furnace combustion fumes is provided. The process comprises removing water vapour occurring in combustion fumes through successive gas compression and expansion steps; separating carbon dioxide from oxygen and nitrogen through the use of a filter comprising a gas-separating material, including fullerenes and zeolites, to obtain substantially pure gaseous carbon dioxide; subsequently optionally producing dry ice through further steps of compression and expansion of the substantially pure gaseous carbon dioxide obtained in the preceding steps.

A system for spacecraft atmosphere CO.sub.2 capture that has a first heat exchanger configured to receive airflow from the spacecraft atmosphere and to cool the airflow via a first heat exchange with CO.sub.2-depleted air. The system further has a pre-cooler configured to receive and cool the airflow from the first heat exchanger, and has a second heat exchanger configured to receive the airflow from the pre-cooler. The second heat exchanger can cool the airflow via a second heat exchange with the CO.sub.2-depleted air. Deposition coolers can operate in a deposition mode in which CO.sub.2 from the airflow is deposited to generate said CO.sub.2-depleted air, and a sublimation mode in which deposited CO.sub.2 is sublimated into CO.sub.2 gas. A controller is configured to alternately cycle each of the first and second deposition coolers between the deposition mode and the sublimation mode.

A system for spacecraft atmosphere CO.sub.2 capture that has a first heat exchanger configured to receive airflow from the spacecraft atmosphere and to cool the airflow via a first heat exchange with CO.sub.2-depleted air. The system further has a pre-cooler configured to receive and cool the airflow from the first heat exchanger, and has a second heat exchanger configured to receive the airflow from the pre-cooler. The second heat exchanger can cool the airflow via a second heat exchange with the CO.sub.2-depleted air. Deposition coolers can operate in a deposition mode in which CO.sub.2 from the airflow is deposited to generate said CO.sub.2-depleted air, and a sublimation mode in which deposited CO.sub.2 is sublimated into CO.sub.2 gas. A controller is configured to alternately cycle each of the first and second deposition coolers between the deposition mode and the sublimation mode.

A process for producing nanoparticles of a substance, including in a first chamber, forming a dispersion of a substance in a fluid and bringing the fluid into a supercritical state; passing the dispersion from the first chamber through a cooling device or into a cooling zone in a second chamber, wherein the cooling device or cooling zone configured to reduce temperature of the dispersion below a temperature at which the fluid forms solid particles such that nanoparticles of the substance are formed, wherein the second chamber comprises a surface configured to receive the solid particles of the fluid and the nanoparticles of the substance; allowing pressure to decrease and/or temperature to increase in the second chamber to transform the solid particles into a gaseous state, removing the fluid in the gaseous state and with the nanoparticles remaining on the surface; and collecting the nanoparticles from the surface.

A process for producing nanoparticles of a substance, including in a first chamber, forming a dispersion of a substance in a fluid and bringing the fluid into a supercritical state; passing the dispersion from the first chamber through a cooling device or into a cooling zone in a second chamber, wherein the cooling device or cooling zone configured to reduce temperature of the dispersion below a temperature at which the fluid forms solid particles such that nanoparticles of the substance are formed, wherein the second chamber comprises a surface configured to receive the solid particles of the fluid and the nanoparticles of the substance; allowing pressure to decrease and/or temperature to increase in the second chamber to transform the solid particles into a gaseous state, removing the fluid in the gaseous state and with the nanoparticles remaining on the surface; and collecting the nanoparticles from the surface.

The invention relates to a device for metering carbon dioxide snow, comprising a storage container and a discharge opening arranged in the base of the storage container. A horizontally and vertically movable base, by means of which the discharge opening can be opened and closed, is arranged in the region of the discharge opening. A horizontally movable cutting knife is vertically spaced from the base and can be moved into the interior of the storage container. Once the storage container is filled with carbon dioxide snow a metered amount of carbon dioxide snow present between the cutting knife and the base is cut off by the cutting knife and compacted by vertical movements of the base and is then discharged by the base moving into the open position.

The present disclosure provides systems for carbon capture in combination with production of one or more industrially useful materials. The disclosure also provides methods for carrying out carbon capture in combination with an industrial process. In particular, carbon capture can include carrying out calcination in a reactor, separation of carbon dioxide rich flue gases from industrially useful products, and capture of at least a portion of the carbon dioxide for sequestration of other use, such as enhanced oil recovery.