The present invention includes: a CO.sub.2 absorption part 141 including a first absorption section 141A for absorbing CO.sub.2 from exhaust gas and a second absorption section 141B that is located below the first absorption section 141A, arranged vertically within a CO.sub.2 absorption tower 14 for absorbing CO.sub.2 from exhaust gas 11B containing CO.sub.2; and a first absorption liquid extraction line L.sub.11 that is provided between the first absorption section 141A and the second absorption section 141B, and that is for extracting, from the absorption tower 14, a CO.sub.2 absorption liquid that has absorbed CO.sub.2 in the exhaust gas at the first absorption section 141A, and for resupplying the CO.sub.2 absorption liquid after being cooled to the second absorption section 141B within the absorption tower 14, wherein an extraction position X of the first absorption liquid extraction line L.sub.11 for extracting the CO.sub.2 absorption liquid from the absorption tower 14 has both a peak liquid temperature in a reaction temperature distribution for the CO.sub.2 absorption liquid inside the first absorption section 141A, and a peak liquid temperature in a reaction temperature distribution for the CO.sub.2 absorption liquid inside the second absorption section 141B.

This invention is directed to methods and systems for controlling water in acid gas removal processes comprising the steps of a) treating the gas stream in an absorption zone with the NAS absorption liquid; b) direction the acid gas-loaded NAS absorption liquid to a regeneration zone; c) directing the regenerated NAS absorption liquid to step a); and d) controlling the first and second set of conditions.

The present invention relates to a system for desorption of acid gas (1) from an acid gas rich absorption liquid having a steam part (3) and a process part (4). The steam part (3) and the process part (4) are separated to prevent intermixing of fluids in the steam part with fluids in the process part. The system (1) comprises a desorption cylinder (9) which is adapted to rotate about a longitudinal axis of rotation A of the desorption cylinder (9), and a stationary support stand (19) for supporting the desorption cylinder (9), and means for rotating (18) the desorption cylinder. The steam part (3) and the process part (4) are integrated in the desorption cylinder (9) and steam is supplied to the steam part (3) and acid gas rich absorption liquid (2) is supplied to the process part (4). The process part (4) comprises a desorption chamber (12) provided with a stripper unit (33) having an integrated reboiler (52) and the process part (4) is provided with means for discharging an acid gas lean absorption fluid (2) and having means for removing acid gas rich vapor (8), and the steam part (3) is provided with means for discharging condensate (6). The present invention also relates to a method for desorption of acid gas from an acid gas rich absorption liquid.

Various embodiments of a portable carbon dioxide (CO2) absorption device that may remove excess CO2 from a closed environment are disclosed herein. The absorption device is reusable and configured for many environments.

The invention provides a process for regenerating a liquid absorbent, comprising: contacting the liquid absorbent with a hydrophobic medium, wherein the liquid absorbent comprises at least one amine of Formula (I) and degradation product thereof comprising at least one imine of Formula (II), wherein each Ar is independently an aromatic group and each R is independently selected from hydrogen, an organyl group and NH.sub.2; and selectively extracting the degradation product into or through the hydrophobic medium. ##STR00001##

A system for carbon dioxide capture from a gas mixture comprises a lean solvent comprising 3-amino-1-propanol (AP), 2-dimethylamino-2-methyl-1-propanol (DMAMP), and water; an absorber containing at least a portion of the lean solvent, wherein the absorber is configured to receive the lean solvent and a gaseous stream comprising carbon dioxide, contact the lean solvent with the gaseous stream, and produce a rich solvent stream and a gaseous stream depleted in carbon dioxide; a stripper, wherein the stripper is configured to receive the rich solvent stream; a cross-exchanger fluidly coupled to a rich solvent outlet on the absorber and a rich solvent inlet on the stripper; a reboiler fluidly coupled to a lower portion of the stripper; and a condenser fluidly coupled to a vapor outlet of the stripper.

The present invention relates to novel molecules suitable to the use in the separation/removal of carbon dioxide from gaseous mixtures as liquid-phase carbon dioxide absorbers and suitable to allow the subsequent release of the absorbed carbon dioxide in form of different ionic liquids, preferentially a glycine salt with choline hexanoate, ester between glycine and hexanoic alcohol (hexyl glycinate) and glycerol ester with glycine and hexanoic acid. The present invention also relates to a method and a plant for the capture of carbon dioxide from gaseous mixtures by using an absorber for carbon dioxide in liquid phase with a heating jacket.

An absorbent is prepared by dissolving in water 1) monoethanolamine (MEA) and 2) a primary amine represented by the following formula (1) and having high steric hindrance. Releasability of CO.sub.2 or H.sub.2S during regeneration of the absorbent is thereby improved, and the amount of water vapor used during regeneration of the absorbent in a facility for recovering CO.sub.2 or H.sub.2S can be reduced. ##STR00001##
R.sub.1 to R.sub.3: H or a hydrocarbon group having 1 to 3 carbon atoms, at least one of R.sub.1 to R.sub.3 being a hydrocarbon.

Provided herein is a method for absorbing CO.sub.2 from a gas mixture. The method includes using an apparatus comprised of a first RPB unit and a second RPB unit. The first RPB unit and the second RPB unit are arranged to absorb CO.sub.2 in a first gas stream and a second gas stream, respectively. A liquid CO.sub.2-absorbent is supplied sequentially passing through the first RPB unit and the second RPB unit to absorb CO.sub.2 in the first gas stream and the second gas stream. The liquid CO.sub.2-absorbent is regenerated to produce a regenerated CO.sub.2-absorbent. The regenerated CO.sub.2-absorbent is transported to the first RPB unit.

Method and apparatus for separating a target substance from a fluid or mixture. Capsules having a coating and stripping solvents encapsulated in the capsules are provided. The coating is permeable to the target substance. The capsules having a coating and stripping solvents encapsulated in the capsules are exposed to the fluid or mixture. The target substance migrates through the coating and is taken up by the stripping solvents. The target substance is separated from the fluid or mixture by driving off the target substance from the capsules.