A system can be used to capture carbon dioxide using cryogenic techniques. The system can include a compression subsystem, a dehydration subsystem, a desublimation subsystem, and a refrigeration subsystem. The compression subsystem can be positioned to receive a gaseous mixture, which can include carbon dioxide, and to compress the gaseous mixture. The dehydration subsystem can be coupled with the compression subsystem to remove water from the received gaseous mixture to generate a compressed dry gaseous mixture. The desublimation subsystem can be coupled with the compression subsystem and the dehydration subsystem to receive the compressed dry gaseous mixture and to cause the carbon dioxide to desublimate from the compressed gaseous mixture. The refrigeration subsystem can be coupled with the desublimation subsystem to provide cooling to the desublimation subsystem using dry air as a refrigerant.

The present disclosure relates to a carbon dioxide capture apparatus and process combined with biogas upgrading, and there is provided the carbon dioxide capture apparatus combined with biogas upgrading for simultaneously obtaining high purity methane and carbon dioxide, and improving separation efficiency without an additional process by making use of gas streams after a liquefaction process, and recovering cold heat in the process.

The invention relates to a device for generating a CO.sub.2 snow jet, comprising an expansion channel (6) which extends in a flow direction (14) for generating a CO.sub.2 gas/CO.sub.2 snow mixture based on liquid CO.sub.2, said expansion channel having an inlet opening (18) for supplying liquid CO.sub.2 and an outlet opening (22) for discharging the CO.sub.2 gas/CO.sub.2 snow mixture. The device also comprises a nozzle for generating an outer jet which surrounds and accelerates the CO.sub.2 gas/CO.sub.2 snow mixture discharged from the outlet opening of the expansion channel. The expansion channel has multiple channel sections (36a, 36b, 36c, 36d, 36e) arranged one behind the other in the flow direction, wherein the expansion channel cross section (40) that lies on a plane orthogonal to the flow direction changes locally in a particular transition or transition region (38a, 38b, 38c, 38d, 38e, 38f) between the channel sections, and the expansion channel (6) cross section (46d) at the upstream end (48d) of a particular channel section (36d) is larger than the expansion channel (6) cross section (46c) at the upstream end (48c) of the channel section (36c) arranged upstream of said channel section (36d) in the flow direction (14).

The invention relates to a device for generating a CO.sub.2 snow jet, comprising an expansion channel (6) which extends in a flow direction (14) for generating a CO.sub.2 gas/CO.sub.2 snow mixture based on liquid CO.sub.2, said expansion channel having an inlet opening (18) for supplying liquid CO.sub.2 and an outlet opening (22) for discharging the CO.sub.2 gas/CO.sub.2 snow mixture. The device also comprises a nozzle for generating an outer jet which surrounds and accelerates the CO.sub.2 gas/CO.sub.2 snow mixture discharged from the outlet opening of the expansion channel. The expansion channel has multiple channel sections (36a, 36b, 36c, 36d, 36e) arranged one behind the other in the flow direction, wherein the expansion channel cross section (40) that lies on a plane orthogonal to the flow direction changes locally in a particular transition or transition region (38a, 38b, 38c, 38d, 38e, 38f) between the channel sections, and the expansion channel (6) cross section (46d) at the upstream end (48d) of a particular channel section (36d) is larger than the expansion channel (6) cross section (46c) at the upstream end (48c) of the channel section (36c) arranged upstream of said channel section (36d) in the flow direction (14).

A system and a method for continuously separating carbon dioxide from gas mixtures, utilizing a continuous loop of porous monoliths which support a sorbent within its pores. Continuously exposing a portion of the continuous loop of monoliths to a flow of gas mixture containing a minor proportion of carbon dioxide, to adsorb carbon dioxide from the flow. The loop passes through a sealed regeneration and carbon dioxide capture assembly located astride a portion of the loop, and which is capable of sealingly containing a monolith in relative movement through the assembly. The assembly chamber comprises a plurality of separately sealed zones, including at least one zone for purging oxygen from the monoliths, a subsequent zone for heating the monolith to release the adsorbed carbon dioxide, and another cooling zone for cooling the monolith prior to reentering the adsorption portion of the loop where it is exposed to oxygen.

A system and a method for continuously separating carbon dioxide from gas mixtures, utilizing a continuous loop of porous monoliths which support a sorbent within its pores. Continuously exposing a portion of the continuous loop of monoliths to a flow of gas mixture containing a minor proportion of carbon dioxide, to adsorb carbon dioxide from the flow. The loop passes through a sealed regeneration and carbon dioxide capture assembly located astride a portion of the loop, and which is capable of sealingly containing a monolith in relative movement through the assembly. The assembly chamber comprises a plurality of separately sealed zones, including at least one zone for purging oxygen from the monoliths, a subsequent zone for heating the monolith to release the adsorbed carbon dioxide, and another cooling zone for cooling the monolith prior to reentering the adsorption portion of the loop where it is exposed to oxygen.

The present disclosure relates to a novel improved method for continuous crystallization of highly crystalline clathrate hydrates. The novel improved method utilizes a novel hydrator capable of overcoming heat and mass transfer limitations that usually constrain crystallization rate and thus reduces process productivity. The disclosed method and hydrator are for production of crystalline clathrates in general, CO.sub.2 capture, capture of other clathrate forming compounds, CO.sub.2 storage and transportation, storage and transportation of any clathrate forming compound in a solid lattice, gas separation or water desalination or purification purposes.

The present disclosure relates to a novel improved method for continuous crystallization of highly crystalline clathrate hydrates. The novel improved method utilizes a novel hydrator capable of overcoming heat and mass transfer limitations that usually constrain crystallization rate and thus reduces process productivity. The disclosed method and hydrator are for production of crystalline clathrates in general, CO.sub.2 capture, capture of other clathrate forming compounds, CO.sub.2 storage and transportation, storage and transportation of any clathrate forming compound in a solid lattice, gas separation or water desalination or purification purposes.