A device for preventing contamination of a positive-pressure connector (6) of an indwelling needle and a method based on same. The device comprises a shell (1), a connecting port (3) fixedly connected to the shell (1) and used for connecting to the positive-pressure connector (6), an air pressure balance hole (5) disposed opposite to the connecting port (3) and provided on the shell (1), and a filtering membrane (2) provided between the air pressure balance hole (5) and the connecting port (3). The device is simple in structure, adopts a structural design of the filtering membrane (2), can filter microorganisms, bacteria, viruses, dusts, and particulate pollution sources, and is used during indwelling of infusion intervals to prevent the positive-pressure connector (6) from being exposed to the air and maintain the aseptic state and positive-pressure condition of the positive-pressure connector (6) during indwelling.

An object of the present invention is to provide a porous support-zeolite membrane composite ensuring that at the time of separation or concentration with a zeolite membrane, both sufficient throughput and high separation performance are achieved in practice and the present invention relates to a porous support-zeolite membrane composite having a porous support and a zeolite membrane formed on the porous support, wherein part of the zeolite membrane penetrates into the inside of the porous support and the distance from the surface of the porous support to the inside into which the zeolite film penetrates is 5.0 m or less on average.

The present invention pertains to a method of producing high fat milk fat globule concentrates by microfiltration, to the concentrates obtained by the method, to a process of producing butter-like milk fat products and to the obtained butter-like milk fat products.

The present disclosure relates to a method for recovering ammonia, the method comprising (a) preparing a gas containing ammonia,(b) supplying the gas containing ammonia to a mixed solution of an aqueous solution of sulfuric acid and a antisolvent of ammonium sulfate, to obtain ammonium sulfate crystals, and (c) separating the ammonium sulfate crystals from the mixed solution, wherein a volume ratio of the antisolvent of ammonium sulfate to the aqueous solution of sulfuric acid is greater than 1.

An object of the present invention is to provide a porous support-zeolite membrane composite ensuring that at the time of separation or concentration with a zeolite membrane, both sufficient throughput and high separation performance are achieved in practice and the present invention relates to a porous support-zeolite membrane composite having a porous support and a zeolite membrane formed on the porous support, wherein part of the zeolite membrane penetrates into the inside of the porous support and the distance from the surface of the porous support to the inside into which the zeolite film penetrates is 5.0 m or less on average.

Provided is a composite separator for gas separation. According to an aspect of the present disclosure, a composite separator for gas separation includes a support and a selective layer disposed on one surface of the support, wherein the support includes a porous polyethylene film, and has a surface roughness of 100 nm or less, a surface median pore diameter of 300 nm or less, and a tensile strength in a machine direction (MD) and a transverse direction (TD) of 10 MPa or more.

Provided is a gas separation membrane for purifying mixed raw material gas including condensable gas, said gas separation membrane exhibiting excellent separation ability and being capable of maintaining a gas permeation rate at a high level for a long time under a condensable gas atmosphere.

A method of measuring concentration of dissolved organic nitrogen in sewage. The method includes: filtering a sewage sample using a filter membrane; measuring the concentrations of total dissolved nitrogen (TDN), ammonia nitrogen (NH.sub.4.sup.+), and nitric nitrogen (NO.sub.3.sup.) in the sewage sample, respectively designated as C.sub.TDN(I), C.sub.NH4.sup.+.sub.(I) and C.sub.NO3.sup..sub.(I); calculating the ratios of (C.sub.NH4.sup.+.sub.(I)+C.sub.NO3.sup..sub.(I))/C.sub.TDN(I) and C.sub.NO3.sup..sub.(I)/C.sub.NH4.sup.+.sub.(I), and according to the ratios, calculating the concentration of dissolved organic nitrogen (DON) in the sewage sample.

Described herein is a cordierite membrane coated on a monolith substrate formed from cordierite. The membrane coating is formed from cordierite particles which have been processed to have a median particle size diameter of between 1 and 3 microns with a narrow particle size distribution suitable for forming a cordierite membrane on a cordierite monolith substrate. After the cordierite membrane is formed on the cordierite monolith substrate, the cordierite membrane monolith has a pore size of less than 1 micron.

To provide a composition in which when the composition is formed into a solution, the clogging of a filter is less likely to be caused, and the solution can be filtered in a short time. A composition comprising: lithium bis(fluorosulfonyl)imide; and an impurity, wherein when the composition is dissolved in a mixed solvent obtained by mixing ethylene carbonate and ethyl methyl carbonate at a volume ratio of 3:7, to prepare a solution having a concentration of the lithium bis(fluorosulfonyl)imide of 1 M, and 50 mL of the solution is pressure-filtered at a pressure of 0.1 MPa using a membrane filter having a pore diameter of 0.2 m and a filtration area of 47 mm, insoluble particles having an average particle diameter of 5 to 150 m remain on the membrane filter.