A hydrophobic MOF-based porous liquid carbon capture absorbent is provided and includes a sterically hindered solvent and a hydrophobic MOFs modified material dispersed in the sterically hindered solvent. A mass percent of the hydrophobic MOFs modified material in the hydrophobic MOF-based porous liquid carbon capture absorbent is 5% to 20%. The hydrophobic MOFs modified material is prepared by a method comprising following steps: dispersing an MOFs material, a surface modifier and a catalyst in an organic solvent, and mixing them evenly, followed by a standing reaction to obtain the hydrophobic MOFs modified material.

Systems comprising a composition where an imidazole is tethered to an amine and a solvent are described herein. Methods of their preparation and use are also described herein. The methods of using the systems include the reduction of volatile compounds from gas streams and liquid stream.

A composition for absorbing carbon dioxide including an ionic liquid (A) containing a cation and an anion, and a protic compound (B) having a relative permittivity at 25 C. of 20 or more, wherein the cation at least includes a cation represented by the formula (1), the anion includes an anion where an acid dissociation constant (pKa) at 25 C. of its conjugate acid in water is 4.5 or more, and the ratio of a value obtained by multiplying the number of hydroxyl groups of the protic compound (B) by the number of moles of the protic compound (B) to the number of moles of the ionic liquid (A) [number of moles of protic compound (B)/number of moles of ionic liquid (A)] is 0.2 to 1.0:

##STR00001##

wherein R.sup.1 and R.sup.2 each independently represent a hydrogen or a C1-C6 linear alkyl group.

The present disclosure provides methods and apparatuses of recovering CO.sub.2 from a gas stream. The methods regenerate CO.sub.2 with high regeneration efficiencies, thereby lowering the overall energy cost for CO.sub.2 capture.

Disclosed are systems and methods which provide a process stream comprising a gaseous component, capture the gaseous component from the process stream by an ionic liquid solvent of a separator, and recover a captured gaseous component from the ionic liquid solvent in a regenerator. A second gaseous component from the process stream may be captured by the ionic liquid solvent of the separator, and the second gaseous component may be recovered from the ionic liquid solvent in the regenerator. Alternatively, the second gaseous component from the process stream may be uncaptured by the ionic liquid solvent, and the uncaptured second gaseous component may be recovered from a membrane unit.

An apparatus for collecting carbon dioxide from flue gas of a power plant. The apparatus includes an absorption tower, a sedimentation pool including slanting boards, a regeneration tower, a gas-liquid separator, a desiccator, a compressor, and a condenser. A rich solution is adapted to flow from a bottom of the absorption tower into the sedimentation pool for stratification. A gas outlet of the gas-liquid separator is in series connection with the desiccator, the compressor, the condenser, and a liquid carbon dioxide storage tank.

A hybrid method for capturing CO.sub.2 from a gas mixture is provided, comprising a step of contacting the CO.sub.2 containing gas mixture with a slurry consisting of a liquid medium, imidazole or imidazole derivative(s), and a metal-organic framework material (MOFs). For the slurry system, the mass fraction of the imidazole or imidazole derivative(s) in it ranging from 2 to 50% and the mass fraction of the metal-organic framework material in it ranging from 5 to 25%. In the technical solution provided in the present invention, through combining absorptive separation by the liquid solution in which the imidazole or imidazole derivative(s) is dissolved, adsorption separation by the MOF material suspended in the solution, and selective permeation separation by a liquid medium film forms on the outside surface of the suspended MOFs, an absorption-adsorption hybrid separation effect for CO.sub.2 gas mixtures is efficiently achieved. In the CO.sub.2 capture method provided in the present invention, conventional absorption separation and adsorptive separation technologies are effectively combined, furthermore, the addition of imidazole or imidazole derivative(s) substantially increases both the CO.sub.2 capture ability and capture amount of the MOFs/liquid slurry, showing a great potential in industrial applications.

A method for collecting carbon dioxide from flue gas of a power plant. The method includes: 1) mixing an organic amine, an ionic liquid, and water to obtain an aqueous solution of a composite absorbent; 2) spraying the aqueous solution of the composite absorbent into the flue gas to allow the flue gas flowing upwardly to fully contact with the downwardly sprayed aqueous solution of the composite absorbent and to allow CO.sub.2 in the flue gas to react with the composite absorbent to yield a solution rich in A.CO.sub.2 and B.CO.sub.2, where A represents the organic amine and B represents the ionic liquid; allowing the solution rich in A.CO.sub.2 and B.CO.sub.2 to stand and clarify to form different liquid layers; 3) thermally decomposing the mixed solution rich in A.CO.sub.2 and B.CO.sub.2 after heat exchange to release the chemically bound CO.sub.2.

A surface treating composition for copper or a copper alloy comprising an imidazole compound and means for using the composition in the soldering of electronic parts to printed wiring boards are disclosed.

A novel blend of piperazine (PZ) and a second amine compound is provided as a superior solvent for CO2 capture from coal-fired flue gas. Blending PZ with various second amine compounds can remediate the precipitation issue of concentrated PZ while maintaining its high CO2 absorption capacity and rate, and high resistance to oxidative degradation.