Abstract: A monolithic separation membrane structure comprises a support body and a separation membrane. The support body is composed of a porous material and includes a plurality of through holes. The separation membrane is formed in a tubular shape on an inner side of the plurality of through holes, and is used in a penetrative vaporization method or a vapor infiltration method. The helium gas permeation resistance in the support body is less than 8.3×107 Pa·sec/m2.

Abstract: A DDR-type zeolite seed crystal has an average particle diameter of less than or equal to 0.2 ?m, and an average aspect ratio of less than or equal to 1.3.

Abstract: A zeolite membrane structure includes a porous support, and a zeolite membrane. The zeolite membrane has a first zeolite layer located in a surface of the porous support, and a second zeolite layer located outside of the surface of the porous support and integrally formed with the first zeolite layer. The porous support has an outermost layer in which the first zeolite layer is located. An average thickness of the first zeolite layer is less than or equal to 5.4 micrometers. A porosity of the outermost layer is greater than or equal to 20% and less than or equal to 60%.

Abstract: A zeolite membrane structure includes a porous support, and a zeolite membrane. The zeolite membrane has a first zeolite layer located in a surface of the porous support, and a second zeolite layer located outside of the surface of the porous support and integrally formed with the first zeolite layer. The porous support has an outermost layer in which the first zeolite layer is located. An average thickness of the first zeolite layer is less than or equal to 5.4 micrometers. A porosity of the outermost layer is greater than or equal to 20% and less than or equal to 60%.

Abstract: A zeolite membrane structure includes a porous support, and a zeolite membrane. The zeolite membrane has a first zeolite layer located in a surface of the porous support, and a second zeolite layer located outside of the surface of the porous support and integrally formed with the first zeolite layer. The porous support has an outermost layer in which the first zeolite layer is located. An average thickness of the first zeolite layer is less than or equal to 5.4 micrometers. An average pore diameter of the outermost layer is greater than or equal to 0.050 micrometers and less than or equal to 0.150 micrometers.

Abstract: There is provided a method for cleaning a ceramic filter which can shorten an operation time required to clean the ceramic filter. The method for cleaning the ceramic filter includes: reducing a pressure of a space on a secondary side of the uncleaned ceramic filter, while supplying a cleaning medium to a space on a primary side of the uncleaned ceramic filter, thereby passing the cleaning medium through the ceramic uncleaned filter, so that the uncleaned ceramic filter is cleaned.

Abstract: A DDR-type zeolite seed crystal has an average particle diameter of less than or equal to 0.2 ?m, and an average aspect ratio of less than or equal to 1.3.

Abstract: A zeolite membrane structure includes a porous support, and a zeolite membrane. The zeolite membrane has a first zeolite layer located in a surface of the porous support, and a second zeolite layer located outside of the surface of the porous support and integrally formed with the first zeolite layer. The porous support has an outermost layer in which the first zeolite layer is located. An average thickness of the first zeolite layer is less than or equal to 5.4 micrometers. An average pore diameter of the outermost layer is greater than or equal to 0.050 micrometers and less than or equal to 0.150 micrometers.

Abstract: A monolithic separation membrane structure comprises a support body and a separation membrane. The support body is composed of a porous material and includes a plurality of through holes. The separation membrane is formed in a tubular shape on an inner side of the plurality of through holes, and is used in a penetrative vaporization method or a vapor infiltration method. The helium gas permeation resistance in the support body is less than 8.3×107 Pa·sec/m2.

Abstract: Provided is a separation membrane manufacturing method capable of easily manufacturing a dense separation membrane. The separation membrane manufacturing method comprises a membrane forming step of forming a separation membrane precursor containing a separation membrane precursor solution on the surface of cells formed in a porous monolith substrate; and a drying step of performing ventilation drying by passing hot air through the cells having the separation membrane precursor in the monolith substrate to dry the separation membrane precursor. During the ventilation drying in the drying step, the temperature of the monolith substrate having the separation membrane precursor is raised to 90° C. within 15 minutes from the start of the passing of the hot air at such a rate of temperature rise that an average rate of temperature rise is 7° C./min or more from the start of the passing of the hot air until the temperature reaches 90° C.

Abstract: A method for using a ceramic filter including dividing a plurality of through channels into a plurality of zones including an outward path and a return path by use of through channel division means disposed along a row in which water collecting cells are arranged in at least one end face of a porous body constituting the ceramic filter in a state where the through channel division means is in contact with the row, so that a mixed fluid undergoes, at least once, a passing process of passing through the outward path in which the mixed fluid flows from the first end face to the second end face of the ceramic filter, returning and then passing through the return path in which the mixed fluid flows from the second end face to the first end face, and collecting a target permeable substance after permeation of a separation membrane.

Abstract: There is disclosed a method for manufacturing a carbon membrane in which a phenolic hydroxyl group is 10,000 ppm or less and whose separating function does not easily deteriorate even after exposure to acidic conditions. The method for manufacturing the carbon membrane has a drying step of drying a resin solution membrane including a phenol resin formed on a substrate; and a carbon membrane preparing step of heating the dried resin solution membrane at 600 to 900° C. in a vacuum or at 650 to 900° C. in a nitrogen atmosphere to carbonize the membrane, thereby obtaining the carbon membrane in which the concentration of the phenolic hydroxyl group is 10,000 ppm or less.

Abstract: Provided is a separation membrane manufacturing method capable of easily manufacturing a dense separation membrane. The separation membrane manufacturing method comprises a membrane forming step of forming a separation membrane precursor containing a separation membrane precursor solution on the surface of cells formed in a porous monolith substrate; and a drying step of performing ventilation drying by passing hot air through the cells having the separation membrane precursor in the monolith substrate to dry the separation membrane precursor. During the ventilation drying in the drying step, the temperature of the monolith substrate having the separation membrane precursor is raised to 90° C. within 15 minutes from the start of the passing of the hot air at such a rate of temperature rise that an average rate of temperature rise is 7° C./min or more from the start of the passing of the hot air until the temperature reaches 90° C.

Abstract: A carbon membrane formed by carbonizing a phenol resin having at least one kind of atomic groups among a methylene bond, a dimethylene ether bond, and a methylol group, wherein the total mole content of the atomic groups is 100 to 180% with respect to the phenolic nuclei. A pervaporation separation method using the carbon membrane is also disclosed.

Abstract: There is disclosed a process for producing a separation membrane The process for producing the separation membrane includes a membrane forming step of passing a precursor solution of the separation membrane through cells of a monolith substrate to form a separation membrane precursor made of the precursor solution 31 on the surfaces of the cells; and then a cell suction step of sucking the insides of the cells from open ends of the cells in a first end face of the monolith substrate, to suck and remove an excess portion of the precursor solution which is present in the cells.

Abstract: Provided is a method of producing a carbon membrane including dipping a porous support in a suspension of a phenolic resin or a suspension of a phenolic resin precursor, drying the resulting support to form a membrane made of the phenolic resin or the phenolic resin precursor, and heat treating and thereby carbonizing the resulting membrane into a carbon membrane.

Abstract: There is provided a method for cleaning a ceramic filter which can shorten an operation time required to clean the ceramic filter. The method for cleaning the ceramic filter includes: reducing a pressure of a space on a secondary side of the uncleaned ceramic filter, while supplying a cleaning medium to a space on a primary side of the uncleaned ceramic filter, thereby passing the cleaning medium through the ceramic uncleaned filter, so that the uncleaned ceramic filter is cleaned.

Abstract: A coating membrane forming method for forming a coating membrane on an object to be coated, the method comprising the steps of: setting the object to be coated for forming a coating membrane thereon in a dipping tank; sending an application liquid for forming the coating membrane into the dipping tank to raise a liquid level of the application liquid till the top of a region for forming the coating membrane thereon in the object to be coated is immersed in the application liquid; and thereafter discharging the application liquid outside the dipping tank to lower the liquid level of the application liquid.

Abstract: A porous carbon membrane has as a loaded component water, alcohol, ether, or ketone loaded on a surface or in a pore, or on the surface and in the pore thereof. The carbon membrane has the loaded component preferably having a molecular weight of 100 or less. The carbon membrane has the loaded component preferably being linear alcohol or linear ether. The carbon membrane has the loaded component preferably being at least one selected from methanol, ethanol, n-propanol, and n-butanol. There is provided a carbon membrane having high separation performance and little change in the separation performance with the passage of time.

Abstract: A separation membrane complex where a carbon membrane is formed directly on a porous body (surface layer) and an intermediate layer has a thickness of 10 to 100 ?m can be used as a filter having improved flux and selectivity in comparison with a conventional one.