A forward osmosis membrane having a low water resistance and an excellent mechanical strength includes a support unit and a selective layer. The support unit includes a plurality of nanostructures, and has opposite first and second surfaces which are defined by the nanostructures. Each of the nanostructures includes a carbon nanotube and a hydrophilic film coated around the carbon nanotube. The hydrophilic film includes a first hydrophilic polymeric material and a second hydrophilic polymeric material. The second hydrophilic polymeric materials of the nanostructures are cross-linked. The selective layer covers and contacts the first surface of the support unit.

A method and device for purifying heptafluoroisobutyronitrile and a dilution gas from a used gas mixture comprising heptafluoroisobutyronitrile, a dilution gas and arcing by-products. The method comprising the steps of (a) contacting the used gas mixture with at least one adsorbent material to generate a gas stream depleted in arcing by-products; (b) contacting the gas stream depleted in by-products with a first membrane to obtain a first permeate stream rich in the dilution gas, and a first retentate stream rich in heptafluoroisobutyronitrile; (c) contacting the first permeate stream rich in the dilution gas with a second membrane to obtain a second permeate stream rich in the dilution gas and a second retentate stream rich in heptafluoroisobutyronitrile; and (d) combining the first and second retentate streams rich in heptafluoroisobutyronitrile.

Disclosed herein are mixed matrix membranes, the mixed matrix membranes comprising a metal organic framework CA dispersed in a continuous polymer phase and methods of making and use thereof. The mixed matrix membranes can comprise a plurality of metal organic framework particles comprising UiO-66-(COOH).sub.2 dispersed in a continuous polymer phase. The mixed matrix membranes can comprise a plurality of metal organic framework particles dispersed in a continuous polymer phase comprising polyethersulfone, polyphenylsulfone, Matrimid, Torlon, cellulose acetate, or combinations thereof. Also disclosed herein are mixed matrix membranes for separating a target ion from a non-target ion in a liquid medium. Also described herein methods of separating a target ion from a non-target ion in a liquid medium using a mixed matrix membrane, wherein the mixed matrix membrane comprises a plurality of metal organic framework particles dispersed in a continuous polymer phase.

There is provided a production method for a resist composition purified product, which includes a step (i) of filtering a resist composition with a filter having a porous structure in which adjacent spherical cells are connected to each other. The filter includes a porous membrane containing at least one resin selected from the group consisting of polyimide and polyamide imide. The resist composition contains a base material component (A) that exhibits changed solubility in a developing solution under action of acid, an onium salt, and an organic solvent component (S), where the content of the organic solvent component (S) is 97% by mass or more.

A method and device for purifying heptafluoroisobutyronitrile and a dilution gas from a used gas mixture comprising heptafluoroisobutyronitrile, a dilution gas and arcing by-products. The method comprising the steps of (a) contacting the used gas mixture with at least one adsorbent material to generate a gas stream depleted in arcing by-products; (b) contacting the gas stream depleted in by-products with a first membrane to obtain a first permeate stream rich in the dilution gas, and a first retentate stream rich in heptafluoroisobutyronitrile; (c) contacting the first permeate stream rich in the dilution gas with a second membrane to obtain a second permeate stream rich in the dilution gas and a second retentate stream rich in heptafluoroisobutyronitrile; and (d) combining the first and second retentate streams rich in heptafluoroisobutyronitrile.

A method of producing a purified product of a resin composition for forming a phase-separated structure, the method including subjecting a resin composition for forming a phase-separated structure to filtration using a filter having a porous structure in which adjacent spherical cells are mutually communicating, the filter being provided with a porous membrane containing at least one resin selected from the group consisting of polyimide and polyamideimide, and the resin composition for forming a phase-separated structure including a block copolymer and an organic solvent component.

A filtering device is for obtaining a chemical liquid by purifying a liquid to be purified, and the filtering device has an inlet portion, an outlet portion, a filter A, at least one filter B different from the filter A, and a flow path which includes the filter A and the filter B arranged in series and extends from the inlet portion to the outlet portion, in which the filter A is a porous membrane containing a polyimide-based resin.

Described are composite hollow fibers filter membranes that include a porous polymeric hollow fiber support and a filter layer; methods of making the composite hollow fibers and using the composite hollow fibers as a filter membrane; methods of making a filter component or filter from the composite hollow fiber; and filter components and filters that contain the composite hollow fibers as filter membranes.

A porous membrane which has a sponge-like morphology. The porous membrane contains imidazole- and benzimidazole-based metal-organic framework fillers embedded in a polymer matrix. Methods of fabricating the porous membrane via steps including solvent casting and coagulating are described. Methods of separating gases using the porous membrane are also provided.

Disclosed is a hollow fiber that contains an outer layer made of a first polymer and an inner layer made of a second polymer, the inner layer including at its outer surface a macrovoid-free thin interface sublayer in contact with the inner surface of the outer layer. The first polymer is immiscible with the second polymer. Also disclosed is a process of preparing the above-described hollow fiber.