The production method includes: a gel-crushing step of grinding a crosslinked hydrogel polymer to obtain a particulate crosslinked hydrogel polymer; a heating drying step of obtaining dried particles from the particulate crosslinked hydrogel polymer by using a continuous stirring drying machine; a post-crosslinking step of post-crosslinking the particulate crosslinked hydrogel polymer or the dried particles; and a sizing step of adjusting a particle size of the dried particles or the post-crosslinked dried particles to obtain water-absorbent resin powder. The particulate crosslinked hydrogel polymer contains a gel fluidizer. A gel temperature of the particulate crosslinked hydrogel polymer containing the gel fluidizer, the gel temperature being measured by a contact thermometer, is not lower than 50° C. In the production method, the dried particles or the post-crosslinked dried particles is forcedly cooled before the sizing step.

Provided are a superabsorbent polymer and a preparation method thereof, including preparing a base resin and conducting surface modification of the base resin in the presence of an inorganic filler. The method of preparing the superabsorbent polymer of the present invention may provide a superabsorbent polymer having improved rewetting property and liquid permeability.

A monolithic organic porous ion exchanger having a continuous skeleton and continuous pores, wherein the continuous skeleton is formed of an organic polymer being a hydrolysate of a crosslinked polymer of a (meth)acrylic acid ester and divinylbenzene, the organic polymer having any one or both of a —COOH group and a —COONa group as ion-exchange groups, the continuous skeleton has a thickness of 0.1 to 100 μm, the continuous pores have an average diameter of 1.0 to 1000 μm, the monolithic organic porous ion exchanger has a total pore volume of 0.5 to 50.0 mL/g, and has a total ion-exchange capacity of the —COOH group and the —COONa group per weight in a dry state of 4.0 mg equivalent/g or more.

A dehumidifying element includes a plurality of sheets that have moisture adsorption and desorption properties and that are stacked on top of each another. At least some of the sheets each have an irregular shape. The sheets each contain a hygroscopic agent having properties of a re-moistening-type glue that exhibits adherence when adsorbing moisture and that solidifies when being dried. The sheets are bonded to each other by the hygroscopic agent.

Cross-linked polyvinyl polymers comprising charged groups and methods of making are disclosed. The polymers are effective and durable adsorbent of dyes from aqueous solutions. Also, a method of removal of dyes from contaminated water is disclosed.

Disclosed is a method for improving a water absorption amount under load by water absorbent resin particles, the method including shaking a powder containing a plurality of water absorbent resin particles contained in a container. An amount of powder corresponding to a theoretical filling rate of less than 100% may be contained in the container.

Disclosed is a method for improving a water absorption amount under load by a powder, the method including shaking a powder containing a plurality of water absorbent resin particles while applying a load to the powder. A maximum value of an acceleration received by the powder to be shaken may be 0.050 to 4.0 G.

Disclosed is a particulate water-absorbent resin composition containing at least one selected from the group consisting of a microporous inorganic material, silver, and a silver compound, and a polymer particle, in which the polymer particle contains an inorganic reducing agent.

A production method of water-absorbent resin particles is disclosed, the method including: preparing a monomer aqueous solution containing an ethylenically unsaturated monomer and silica; polymerizing the ethylenically unsaturated monomer in the monomer aqueous solution by an aqueous solution polymerization method to obtain a hydrogel-like polymer; and coarsely crushing the hydrogel-like polymer, in which a concentration of the silica in the monomer aqueous solution is 0.02 to 4.0 ppm.

A method of fabrication of a porous polymer aerogel amine material includes preparing a solution comprising at least a solvent, amine monomers having protecting groups, one or more crosslinkers, and one or more radical initiators, heating the solution to promote polymerization and to produce a polymerized material, performing solvent exchange with the polymerized material, causing a deprotection reaction in the polymerized material to remove the protecting groups to produce a deprotected material, soaking and rinsing the deprotected material to remove excess reagents and any byproducts of the deprotection reaction, and drying the deprotecting material to produce the amine sorbent. A system to separate CO.sub.2 from other gases has a polymer porous aerogel sorbent having greater than 5 wt % of amine containing vinyl monomers integrated into a polymer backbone, and the amine containing vinyl monomers may have a molecular weight of less than 100 g/mol.