A method for manufacturing a carbon dioxide adsorbent includes preparing an amine aqueous solution having an amine compound concentration ranging from 5% to 70% inclusive and a temperature ranging from 10° C. to 100° C. inclusive, impregnating silica gel with the amine aqueous solution, and aeration-drying the silica gel carrying the amine compound. The silica gel has a particle size ranging from 1 mm to 5 mm inclusive, an average pore diameter ranging from 10 nm to 100 nm inclusive, and a pore volume ranging from 0.1 cm.sup.3/g to 1.3 cm.sup.3/g inclusive.

The present invention provides a process for capturing CO.sub.2 from a gas stream, the process at least comprising the steps of: (a) providing a CO.sub.2-containing gas stream; (b) contacting the gas stream as provided in step (a) in an adsorption zone with solid adsorbent particles thereby obtaining CO.sub.2-enriched solid adsorbent particles (c) passing CO.sub.2-enriched solid adsorbent particles as obtained in step (b) from the bottom of the adsorption zone to the bottom of a first desorption zone; (d) removing a part of the CO.sub.2 from the CO.sub.2-enriched solid adsorbent particles in the first desorption zone, thereby obtaining partly CO.sub.2-depleted solid adsorbent particles and a first CO.sub.2-enriched gas stream; (e) passing the partly CO.sub.2-depleted solid adsorbent particles as obtained in step (d) via a riser to a second desorption zone; (f) removing a further part of the CO.sub.2 from the partly CO.sub.2-depleted solid adsorbent particles in the second desorption zone thereby obtaining regenerated solid adsorbent particles and a second CO.sub.2-enriched gas stream; and (g) recycling regenerated solid adsorbent particles as obtained in step (f) to the adsorption zone of step (b); wherein the second desorption zone is located above the adsorption zone.

The present invention concerns a process for the separation of a gas mixture containing CO.sub.2 and at least one inert gaseous species, comprising (a) feeding the gas mixture into an adsorption column via a first inlet located at a first side of the column, wherein the adsorption column contains a solid CO.sub.2 sorbent loaded with H.sub.2O molecules and thereby desorbing H.sub.2O molecules and adsorbing CO.sub.2 molecules, to obtain a sorbent loaded with CO.sub.2 and an inert product stream; and then (b) feeding a stripping gas comprising H.sub.2O into the adsorption column via a second inlet located at a second side which is opposite to the first inlet, thereby stripping the sorbent and desorbing CO.sub.2 molecules and adsorbing H.sub.2O molecules, to obtain a sorbent loaded with H.sub.2O and the CO.sub.2 product stream, wherein the adsorption column is re-used in step (a) after being stripped in step (b). The invention also concerns an apparatus for performing the process according to the invention.

A method of treating a sorbent having a species sorbed thereto includes simultaneously providing first and second fluids to the sorbent to heat the sorbent and desorb the sorbed species from the sorbent. The first fluid is different from the second fluid. The first fluid includes steam. The second fluid is separable from the first fluid and the desorbed species.

The present application is directed to processes for removing carbon dioxide (CO.sub.2) from low CO.sub.2 concentration gaseous streams. The process comprises contacting the gaseous stream with a hydrogel for absorbing at least some CO.sub.2 from the gaseous stream. The hydrogel comprises a cross-linked hydrophilic polymer comprising a hydrophilic polymer cross-linked with a cross-linking agent. Processes for preparing the hydrogel, types of hydrogels, using the hydrogel to remove CO.sub.2 from gaseous streams, and regenerating the hydrogel to recover absorbed CO.sub.2 from the hydrogel are also disclosed.

A carbon dioxide adsorbent including silica gel and an amine compound carried by the silica gel. The silica gel has a spherical shape, a particle size ranging from 1 mm to 5 mm inclusive, an average pore diameter ranging from 10 nm to 100 nm inclusive, a pore volume ranging from 0.1 cm.sup.3/g to 1.3 cm.sup.3/g inclusive, and a waterproof property N that is defined by an expression (1) and that is not lower than 45%,
N=(W/W.sub.0)×100  (1) where N is the waterproof property in percentage (%) of the silica gel, W.sub.0 is a total number of particles of the silica gel immersed in water, W is a number of particles of the silica gel not subjected to breakage out of W.sub.0.

A device for regenerating materials using a plasma field. The device includes a flow unit configured to flow a gas or a liquid and a plasma unit coupled to the flow unit and including a plurality of electrodes and a sorbent bed having a sorbent material. The plasma unit is configured to receive the flow of the gas or liquid from the flow unit so that the gas or liquid flows through the sorbent material and a predetermined chemical species in the gas or liquid is adsorbed or absorbed by the sorbent material. The device also includes a power source providing a power signal to one or more of the electrodes. The electrodes are configured so that the power signal generates a plasma field in the sorbent material that causes the adsorbed or absorbed chemical species to desorb from the sorbent material.

An adsorption material is disclosed that comprises a metal-organic framework and a plurality of ligands. The metal-organic framework comprising a plurality of metal ions. Each respective ligand in the plurality of ligands is amine appended to a respective metal ion in the plurality of metal ions of the metal-organic framework. Each respective ligand in the plurality of ligands comprises a substituted 1,3-propanediamine. The adsorbent has a CO.sub.2 adsorption capacity of greater than 2.50 mmol/g at 150 mbar CO.sub.2 at 40° C. Moreover, the adsorbent is configured to regenerate at less than 120° C. An example ligand is diamine 2,2-dimethyl-1,3-propanediamine. An example of the metal-organic framework is Mg.sub.2(dobpdc), where dobpdc.sup.4− is 4,4′-dioxidobiphenyl-3,3′-dicarboxylate. Example applications for the adsorption material are removal of carbon dioxide from flue gas and biogasses.

The disclosure generally relates to CCS sorbents, particularly for CO.sub.2/H.sub.2O displacement desorption process. The sorbent includes an aluminum oxide support and an alkali metal salt impregnated on the support, and a silicon modification of the sorbent to reduce water uptake by the sorbent and make it more hydrophobic. The silicon modification can be an organosilyl moiety added after the initial sorbent is complete, or a silica source added to the aluminum oxide structure, typically via impregnation. The sorbents demonstrate better H.sub.2O/CO.sub.2 ratios. Compositions and methods of making are disclosed.

A method for manufacturing a carbon dioxide adsorbent includes: forming a kneaded product containing a hydrophilic fiber, a powdery porous material, and an aqueous hydrophilic binder dispersion into particles and drying the particles to generate porous material particles containing the hydrophilic fiber and the powdery porous material combined by the hydrophilic binder; and preparing an aqueous amine solution having an amine concentration of 5% or more and 70% or less and a temperature of 10° C. or higher and 100° C. or lower, impregnating the aqueous amine solution into the porous material particles, and aeration-drying the porous material particles impregnating the amine. The carbon dioxide adsorbent contains the porous material particles and the amine carried by the porous material particles, the porous material particles containing the hydrophilic fiber and the powdery porous material combined by the hydrophilic binder.