A chemical liquid manufacturing apparatus is provided. The manufacturing apparatus at least includes an ion exchange medium and an ion adsorption medium configured downstream from the ion exchange medium. A material of the ion adsorption medium includes a resin material having an amide bond or an imide bond. A manufacturing method of a chemical liquid using the apparatus is also provided.

Provided are a polyimide and/or polyamideimide porous body and method for manufacturing same, method for separation and/or adsorption using the porous body, a separation material, adsorption material, and filter media composed of the porous body, a laminate, and a filter device. A polyimide and/or polyamideimide porous body in which the polyimide and/or polyamideimide has at least one group selected from the group consisting of a carboxy group, a salt-type carboxy group, and a NH bond.

A process for preparing a membrane comprising applying a composition comprising a polyimide to a gas-permeable support and irradiating the composition with UV-C light source to form a discriminating layer on the support, wherein: (i) the UV-C light source emits light having a wavelength in the range 200 to 280 nm; (ii) the irradiation is performed for a period of time in the range 0.05 to 60 seconds; and (iii) the irradiation is performed at a power intensity of at least 20 mW/cm.sup.2 and no more than 250 mW/cm.sup.2

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.

A gas separation system includes: a first gas separation membrane unit; a second gas separation membrane unit; a material gas feed line connected to a gas inlet port of the unit; a first compressor interposed to the line; a first connection line connecting a permeated gas discharge port of the unit and a gas inlet port of the unit; and a second connection line connecting a non-permeated gas discharge port of the unit and the line. The unit and unit each have a gas separation selectivity of 30 or greater. The CH.sub.4 recovery rate is 98% or higher. The CO.sub.2 content in non-permeated gas of the unit is 5 mol % or less. The flow rate of gas fed to the unit is 60% or less of the flow rate of material gas fed to the unit.

A composite hollow fiber membrane having improved water permeability and peel strength and a manufacturing method thereof are disclosed. The composite hollow fiber membrane includes a tubular polymer membrane having an outer surface and an inner surface, and a tubular braid disposed between the outer surface and the inner surface of the tubular polymer membrane, the tubular braid comprises a plurality of yarns, each of the yarns includes first multifilaments and second multifilaments, each of the first multifilaments includes a plurality of first monofilaments having fineness of 3 to 50 denier, and each of the second multifilaments includes a plurality of second monofilaments having fineness of 0.4 to 3 denier.

A composite membrane comprising: (a) a porous support; (b) optionally a gutter layer; (c) a polyimide discriminating layer; and (d) a protective layer comprising dialkylsiloxane groups and having an average thickness of 825 to 2,000 nm; wherein the polyimide discriminating layer comprises 2,4,6-trimethyl-1,3-phenylene groups, each such group independently having an atom or substituent other than H at the 5-position.

The present invention provides nanofiltration membranes with reduced chemical reactivity that can be utilized in manufacturing processes where reactive feedstocks and/or products are utilized or produced. Methods of making and using the membranes are also provided.

A process for producing nitrogen-rich air by feeding high temperature air at 150 C. or more to an air separation membrane module is described. After being placed at 175 C. for two hours, the air separation module exhibits a shape-retention ratio of 95% or more in one embodiment. The nitrogen-rich air can be fed to a fuel tank for an aircraft, for example.

An object of the present invention is to provide a chemical liquid which has excellent defect inhibition performance and hardly breaks a transfer pipe line that a device for manufacturing the chemical liquid includes at the time of manufacturing the chemical liquid. Another object of the present invention is to provide a chemical liquid storage body, a manufacturing method of a chemical liquid, and a manufacturing method of a chemical liquid storage body. The chemical liquid according to an embodiment of the present invention is a chemical liquid containing an organic solvent and an ion of at least one kind of atom selected from the group consisting of an Fe atom, a Cr atom, a Ni atom, and a Pb atom, in which in a case where the chemical liquid contains one kind of the ion, a content of the metal ion is 0.1 to 100 mass ppt, in a case where the chemical liquid contains two or more kinds of the ions, a content of each of the metal ions is 0.1 to 100 mass ppt, and a charge potential is equal to or lower than 100 mV.