Abstract: The present invention provides a separation membrane that is suitable for separating an acid gas from a gas mixture containing the acid gas and has a high acid gas permeability. A separation membrane (10) of the present invention includes: a separation functional layer (1); a porous support member (3) supporting the separation functional layer (1); and an intermediate layer (2) disposed between the separation functional layer (1) and the porous support member (3), and including a matrix (4) and nanoparticles (5) dispersed in the matrix (4).

Abstract: The present invention provides a separation membrane having high separation performance in terms of a gas mixture containing an acid gas. A separation membrane 10 of the present invention includes a separation functional layer 1 including: graphene oxide; an ionic liquid; and a polymer. The ionic liquid is, for example, hydrophilic and contains an imidazolium ion and tetrafluoroborate. A method for manufacturing the separation membrane 10 of the present invention includes: applying a coating liquid containing the graphene oxide, the ionic liquid, and the polymer to a substrate to obtain a coating film; and drying the coating film.

Abstract: A purification system is for purifying a mixture containing a first solvent, a second solvent, and an impurity. The purification system includes a first membrane separation device including a pervaporation membrane and a second membrane separation device including a filtration membrane. The pervaporation membrane separates the mixture into a first permeated fluid and a first concentrated fluid. The first permeated fluid has a lower concentration of the impurity than that in the mixture, and the first concentrated fluid has a higher concentration of the impurity than that in the mixture. The filtration membrane separates the first concentrated fluid into a second permeated fluid and a second concentrated fluid. The second permeated fluid has a lower concentration of the impurity than that in the first concentrated fluid, and the second concentrated fluid has a higher concentration of the impurity than that in the first concentrated fluid.

Abstract: The present invention relates to an ionic liquid-containing structure including an ionic liquid composed of a pair of a cation and an anion, in which a HOMO energy level of the anion is higher than an LUMO energy level of the cation, and a difference between the HOMO energy level of the anion and the LUMO energy level of the cation is 0.2 a.u. or more.

Abstract: The present invention provides a separation membrane that is suitable for separating an acid gas from a gas mixture containing the acid gas and has a high acid gas permeability. A separation membrane (10) of the present invention includes: a separation functional layer (1); a porous support member (3) supporting the separation functional layer (1); and an intermediate layer (2) disposed between the separation functional layer (1) and the porous support member (3), and including a matrix (4) and nanoparticles (5) dispersed in the matrix (4).

Abstract: The present invention relates to a method for producing an ionic liquid-containing structure, including: an inorganic network structure forming step of forming a network structure of an inorganic compound in the presence of an ionic liquid; and a polymer network structure forming step of forming a polymer network structure of a prepolymer and a crosslinking agent in the presence of the ionic liquid.

Abstract: An object of the present invention is to provide a method which can produce an ionic liquid-containing network structure with high productivity. A method for producing an ionic liquid-containing structure, which includes an inorganic particle network structure forming step of forming a network structure by inorganic particles in the presence of an ionic liquid, and a polymer network structure forming step of forming a network structure by polymerization of a monomer component containing at least a polar group-containing monomer in the presence of the ionic liquid is provided.

Abstract: An aspect of the present invention relates to a separation membrane for selectively separating a component (A) from a fluid containing the component (A) and a component (B), wherein the separation membrane has a first surface and a second surface opposite to the first surface, an affinity of the first surface side of the separation membrane for the component (A) is higher than an affinity of the first surface side of the separation membrane for the component (B), and an affinity of the second surface side of the separation membrane for the component (A) is higher than the affinity of the first surface side of the separation membrane for the component (A).

Abstract: The separation membrane of the present invention includes: a separation function layer including a high-molecular polymer as a matrix and an amine compound represented by the formula [I] and/or [II] below; and hydrophobic layers arranged on both faces of the separation function layer. The separation function layer includes a crack inhibitor. (In the formula, A1 represents a divalent organic residue having 1 to 3 carbon atoms, and n represents an integer of 0 or 1.) (In the formula, A2 represents a divalent organic residue having 1 to 3 carbon atoms, and n represents an integer of 0 or 1.

Abstract: The present invention provides a carbon dioxide separation membrane having a grafted chain into which a substituent having high selective affinity for carbon dioxide is introduced and thus having high carbon dioxide separation capability. The present invention is a method for producing a carbon dioxide separation membrane. This method includes the steps of: (1) irradiating a polymer film with radiation; (2) forming, in the irradiated polymer film, a grafted chain containing a repeating unit of a monomer having a substituent capable of forming a salt with a fluoride ion; and (3) subjecting the substituent capable of forming a salt with a fluoride ion to treatment with a fluoride salt so as to form a salt with a fluoride ion in the substituent.