Abstract: A method for inspecting a separation membrane module has a sealing step for sealing a gas for inspection on a primary side of zeolite membrane. The dynamic molecular diameter for the gas for inspection is greater than 1.07 times the pore diameter in the zeolite membrane. The gas for inspection has the characteristic of having a rate of reduction for a CO2 gas permeation rate in the zeolite membrane of less than 10% when a separation membrane structure is allowed to stand for 60 minutes in the gas for inspection at 25 degrees C. and 0.1 MPaG.

Abstract: A gas separator includes a separation membrane complex in which a separation membrane with pores having a mean pore diameter less than or equal to 1 nm is formed on a porous support, and a gas supply part that supplies a mixed gas including CO2 and another gas from the side of the separation membrane to the separation membrane complex. Then, CO2 in the mixed gas is caused to permeate through the separation membrane and the support and is separated from the mixed gas in a state in which at least part of a permeation surface of the support, from which a gas having permeated through the separation membrane is exhausted, has a temperature lower by 10° C. or more than the temperature of the mixed gas before being supplied to the separation membrane complex.

Abstract: A separation membrane complex includes a porous support and a separation membrane formed on the support and used to separate fluid. A supply/permeation area ratio obtained by dividing a supply-side surface area by a permeation-side surface area is higher than or equal to 1.1 and lower than or equal to 5.0, the supply-side surface area being the area of a region of the surface of the separation membrane to which fluid is supplied, the permeation-side surface area being the area of a region of the surface of the support from which fluid that has permeated through the separation membrane and the support flows off.

Abstract: A gas separation method includes supplying a mixed gas to a zeolite membrane complex and permeating a high permeability gas through the zeolite membrane complex to separate the high permeability gas from other gases. The mixed gas includes a high permeability gas and a trace gas that is lower in concentration than the high permeability gas. The molar concentration of a first gas included in the trace gas in the mixed gas is higher than the molar concentration of a second gas included in the trace gas in the mixed gas. The adsorption equilibrium constant of the first gas on the zeolite membrane is less than 60 times that of the high permeability gas. The adsorption equilibrium constant of the second gas on the zeolite membrane is 400 times or more that of the high permeability gas.

Abstract: A gas separation method includes supplying a mixed gas to a zeolite membrane complex and permeating a high permeability gas through the zeolite membrane complex to separate the high permeability gas from other gases. The mixed gas includes a high permeability gas and a trace gas that is lower in concentration than the high permeability gas. The trace gas contains an organic substance whose molar concentration in the mixed gas is higher than or equal to 1.0 mol %. The adsorption equilibrium constant of the organic substance on the zeolite membrane is less than 150 times the adsorption equilibrium constant of the high permeability gas.

Abstract: A zeolite membrane complex includes a porous support, and a zeolite membrane formed on the support. The zeolite membrane includes a zeolite crystal phase constituted by a plurality of zeolite crystals, and a dense grain boundary phase, which is a region between the plurality of zeolite crystals. A density of at least part of the grain boundary phase is smaller than a density of the zeolite crystal phase. A width of the grain boundary phase is 2 nm or more and 10 nm or less. Accordingly, it is possible to realize high permeability and high separating performance, and high durability of the zeolite membrane.

Abstract: A method for inspecting a separation membrane structure includes an assembly step of sealing a separation membrane structure that includes a porous substrate and a separation membrane into a casing, and an inspection step of applying pressure to an inspection liquid that has filled a first main surface side of the separation membrane.

Abstract: A separation membrane structure has partition walls including a honeycomb shaped porous ceramic body provided with a large number of pores, and cells to become through channels of a fluid are formed by the partition walls. The cells include separation cells and slit cells. In the separation cells, the intermediate layer is disposed on the surface of a substrate, and a separation layer is further formed. The intermediate layer has a structure where aggregate particles are bonded to one another by an inorganic bonding material having a thermal expansion coefficient equal to or higher than that of the aggregate particles.

Abstract: A monolithic separation membrane structure according to the present invention includes a porous support body and a separation membrane. The porous support body has a plurality of filtration cells opening at both end surfaces, a plurality of water collecting cells closed on the both end surfaces, a plurality of discharge flow paths running through the plurality of water collecting cells and opening on an outer peripheral surface, and a monolithic base body including the outer peripheral surface. The separation membrane is formed on inside surfaces of the plurality of filtration cells. The plurality of filtration cells includes a first filtration cell and a second filtration cell which are adjacent to each other. The plurality of water collecting cells include water collecting cell which is adjacent to the first filtration cell and are separated from the second filtration cells.

Abstract: An aluminophosphate-metal oxide bonded body including a metal oxide having a bonding surface on a part of the surface thereof, and aluminophosphate that is disposed on the bonding surface of the metal oxide, wherein an alkali metal, an alkaline earth metal or both of these is/are disposed on the bonding surface of the metal oxide, and the content rate of the alkali metal, alkaline earth metal or both is from 0.3 to 30.0% by mass with respect to all of the substances that are disposed on the bonding surface of the metal oxide. An aluminophosphate-metal oxide bonded body that provides a favorable bonded state even for complicated shapes is provided.

Abstract: A zeolite membrane composite includes a porous support and a zeolite membrane formed on the support. The zeolite membrane includes a low-density layer that covers the support, and a compact layer that covers the low-density layer. The compact layer has a higher content of a zeolite crystalline phase than the low-density layer. By in this way forming the compact layer on the low-density layer that covers the support, the thin compact layer with no defects can be formed more easily than in the case where a compact layer is formed directly on a support.

Abstract: A porous support includes a base body, a supporting layer, and a topmost layer. The supporting layer is disposed between the base body and the topmost layer, and makes contact with the topmost layer. A ratio of a porosity of the topmost layer to a porosity of the supporting layer is greater than or equal to 1.08. A ratio of a thickness of the topmost layer to a thickness of the supporting layer is less than or equal to 0.9.

Abstract: A gas separator includes a separation membrane complex in which a separation membrane with pores having a mean pore diameter less than or equal to 1 nm is formed on a porous support, and a gas supply part that supplies a mixed gas including CO2 and another gas from the side of the separation membrane to the separation membrane complex. Then, CO2 in the mixed gas is caused to permeate through the separation membrane and the support and is separated from the mixed gas in a state in which at least part of a permeation surface of the support, from which a gas having permeated through the separation membrane is exhausted, has a temperature lower by 10° C. or more than the temperature of the mixed gas before being supplied to the separation membrane complex.

Abstract: A zeolite membrane complex includes a porous support, and a zeolite membrane formed on the support. The zeolite membrane includes a zeolite crystal phase constituted by a plurality of zeolite crystals, and a dense grain boundary phase, which is a region between the plurality of zeolite crystals. A density of at least part of the grain boundary phase is smaller than a density of the zeolite crystal phase. A width of the grain boundary phase is 2 nm or more and 10 nm or less. Accordingly, it is possible to realize high permeability and high separating performance, and high durability of the zeolite membrane.

Abstract: A package comprises an airtight container having an oxygen permeability of less than or equal to 15 ml/m2dMPa and water vapor permeability of less than or equal to 2 g/m2d, and a sub-nano membrane structure accommodated in the airtight container. The sub-nano membrane structure having a porous support and a sub-nano membrane. The sub-nano membrane formed on the porous support and having an average pore diameter of less than or equal to 1 nm.

Abstract: A method for inspecting a separation membrane module has a sealing step for sealing a gas for inspection on a primary side of zeolite membrane. The dynamic molecular diameter for the gas for inspection is greater than 1.07 times the pore diameter in the zeolite membrane. The gas for inspection has the characteristic of having a rate of reduction for a CO2 gas permeation rate in the zeolite membrane of less than 10% when a separation membrane structure is allowed to stand for 60 minutes in the gas for inspection at 25 degrees C. and 0.1 MPaG.

Abstract: A method for inspecting a separation membrane structure includes an assembly step of sealing a separation membrane structure that includes a porous substrate and a separation membrane into a casing, and an inspection step of applying pressure to an inspection liquid that has filled a first main surface side of the separation membrane.

Abstract: Provided is a zeolite membrane manufactured by: subjecting a porous body to heat treatment at 400° C. or more in the presence of oxygen as pretreatment, before adhering zeolite seed crystals to a surface of the porous body; storing the porous body under an environment of humidity of 30% or more for 12 hours or more after the heat treatment; and subsequently adhering the zeolite seed crystals to the porous body. The zeolite membrane having oxygen eight-membered rings, which is manufactured by subjecting the porous body to the heat treatment, provides a value that is obtained by dividing a permeance of CF4 by a permeance of CO2 to be 0.015 or less, and has fewer defects.

Abstract: Each cell is pressurized with gas from outside of the cell, the amount of permeation of the gas permeated into each cell is measured, and a cell having the amount of permeation greater than (average value of all cells+A) (wherein A is a predetermined value of ? to 6?, where ? is the standard deviation) is considered to be defective. Alternatively, pressure is reduced for each cell, the degree of vacuum in each cell is measured, and a cell having the degree of vacuum worse than (average value of all cells+A) is considered to be defective. Then, a polymer compound is poured into the defective cells of the monolithic separation membrane structure and cured so that the defective cells are sealed. Alternatively, the polymer compound formed in advance as the sealing member is inserted into the defective cells to seal the defective cells.

Abstract: A monolithic separation membrane structure according to the present invention includes a porous support body and a separation membrane. The porous support body has a plurality of filtration cells opening at both end surfaces, a plurality of water collecting cells closed on the both end surfaces, a plurality of discharge flow paths running through the plurality of water collecting cells and opening on an outer peripheral surface, and a monolithic base body including the outer peripheral surface. The separation membrane is formed on inside surfaces of the plurality of filtration cells. The plurality of filtration cells includes a first filtration cell and a second filtration cell which are adjacent to each other. The plurality of water collecting cells include water collecting cell which is adjacent to the first filtration cell and are separated from the second filtration cells.