Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A gas separation membrane module in which deformation of a tube sheet such as swelling and shrinkage can be prevented in gas separation. The gas separation membrane module includes a hollow fiber bundle provided by bundling multiple hollow fiber membranes, a module vessel in which the hollow fiber bundle is placed, and a tube sheet fixing the plurality of hollow fiber membranes at an end portion of hollow fiber bundle. The cross section of the tube sheet includes a hollow fiber membrane embedded portion in which the hollow fiber membranes are embedded and a solid portion in which no hollow fiber membrane is embedded, and the solid portion is located outside the hollow fiber membrane embedded portion. At least some of the hollow fiber membranes are wound with reinforcing fiber cloth at least within the hollow fiber membrane embedded portion.

Abstract: A gas separation membrane module, comprising: a hollow fiber element having a hollow fiber bundle consisting of a number of hollow fiber membranes and a tube sheet provided at an end of the hollow fiber bundle for binding the hollow fiber membranes; a vessel having an opening through which the hollow fiber element is inserted or removed; a lid member having a gas outlet formed therein and attached to cover the opening of the vessel; and a perforated plate having a plurality of through holes for forming gas channels formed therein, the perforated plate being mounted between the tube sheet and the lid member, the gas separation membrane module performing gas separation by supplying mixed gas to the hollow fiber membranes.

Abstract: A gas separation membrane module in which deformation of a tube sheet such as swelling and shrinkage can be prevented in gas separation. The gas separation membrane module includes a hollow fiber bundle provided by bundling multiple hollow fiber membranes, a module vessel in which the hollow fiber bundle is placed, and a tube sheet fixing the plurality of hollow fiber membranes at an end portion of hollow fiber bundle. The cross section of the tube sheet includes a hollow fiber membrane embedded portion in which the hollow fiber membranes are embedded and a solid portion in which no hollow fiber membrane is embedded, and the solid potion is located outside the hollow fiber membrane embedded portion. At least some of the hollow fiber membranes are wound with reinforcing fiber cloth at least within the hollow fiber membrane embedded portion.

Abstract: 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.

Abstract: A gas separation membrane module, comprising: a hollow fiber element having a hollow fiber bundle consisting of a number of hollow fiber membranes and a tube sheet provided at an end of the hollow fiber bundle for binding the hollow fiber membranes; a vessel having an opening through which the hollow fiber element is inserted or removed; a lid member having a gas outlet formed therein and attached to cover the opening of the vessel; and a perforated plate having a plurality of through holes for forming gas channels formed therein, the perforated plate being mounted between the tube sheet and the lid member, the gas separation membrane module performing gas separation by supplying mixed gas to the hollow fiber membranes.

Abstract: There is provided a process for producing nitrogen-rich air by feeding a high temperature air at 150° C. or more to an air separation membrane module.

Abstract: A gas separation membrane module has a vessel housing a hollow fiber element including a hollow fiber bundle consisting of a number of hollow fiber membranes (1) and a tube sheet (2) holding one end of the hollow fiber bundle. The interior of the vessel is partitioned by the tube sheet (2) into two spaces consisting of a raw gas chamber and a permeate gas chamber. A high-pressure mixed gas is fed into the raw gas chamber where gas separation is carried out. The gas separation membrane module has a configuration where during operation, the tube sheet (2) is supported by means of a perforated plate (8) in the vessel by a pressure from the mixed gas fed to maintain airtightness between the two spaces and when the tube sheet (2) receives a pressure in the reverse direction to that applied during the operation of the gas separation membrane module, the tube sheet (2) is forced to move within the vessel by the pressure in the reverse direction, thereby losing airtightness between the two spaces.

Abstract: A gas separation membrane module has a vessel housing a hollow fiber element including a hollow fiber bundle consisting of a number of hollow fiber membranes (1) and a tube sheet (2) holding one end of the hollow fiber bundle. The interior of the vessel is partitioned by the tube sheet (2) into two spaces consisting of a raw gas chamber and a permeate gas chamber. A high-pressure mixed gas is fed into the raw gas chamber where gas separation is carried out. The gas separation membrane module has a configuration where during operation, the tube sheet (2) is supported by means of a perforated plate (8) in the vessel by a pressure from the mixed gas fed to maintain airtightness between the two spaces and when the tube sheet (2) receives a pressure in the reverse direction to that applied during the operation of the gas separation membrane module, the tube sheet (2) is forced to move within the vessel by the pressure in the reverse direction, thereby losing airtightness between the two spaces.

Abstract: An asymmetric hollow-fiber gas separation membrane is made of a soluble aromatic polyimide that is composed of a specific repeating unit. The tetracarboxylic acid component of the unit has a diphenylhexafluoropropane structure and a biphenyl structure. The diamine component of the unit essentially contains diaminobenzoic acids and any of diaminodibenzothiophenes, diaminodibenzothiophene=5,5-dioxides, diaminothioxanthene-10,10-diones, and diaminothioxanthene-9,10,10-triones.

Abstract: A method for separating and recovering oxygen-rich air from the air, comprising, using a gas separation membrane module where a laminate consisting of a permeate-side spacer for forming a permeate gas channel communicated with a hollow section in a core tube for collecting and discharging a permeate gas and two flat-film gas separation membranes sandwiching the spacer and a feed-side spacer for forming a feed gas channel are spirally wound around the core tube such that the laminate and the feed-side spacer are alternately superimposed, vacuuming the hollow section of the core tube to 95 kPaA (absolute pressure) or less by vacuuming means while feeding the air into the feed gas channel by air feed means such that a maximum feed-air flow rate and a maximum static pressure divided by an effective membrane area of the gas separation membrane are 100 m3/min·m2 or less and 4000 Pa/m2 or less, respectively, to separate and recover oxygen-rich air from the hollow section of the core tube.

Abstract: An asymmetric hollow-fiber gas separation membrane is made of a soluble aromatic polyimide that is composed of a specific repeating unit. The tetracarboxylic acid component of the unit has a diphenylhexafluoropropane structure and a biphenyl structure. The diamine component of the unit essentially contains diaminobenzoic acids and any of diaminodibenzothiophenes, diaminodibenzothiophene=5,5-dioxides, diaminothioxanthene-10,10-diones, and diaminothioxanthene-9,10,10-triones.

Abstract: A humidifying device (10), for humidifying a gas with the water vapor contained in air, comprises: a hollow fiber bundle (14) formed by bundling a plurality of hollow fibers (14a) permeable by water vapor, the hollow fibers being orientated in a direction of a predetermined axis; a housing (12) having a space for accommodating the hollow fiber bundle (14), and having an introduction port (12a) for the gas to be humidified, communicating to bores of the hollow fibers, a discharging port (12b) for the gas to be humidified, communicating to the interior spaces of the hollow fibers, an air inlet (12c) communicating to a space in the housing external of the hollow fibers, and an air exit (12d) communicating to the space in the housing external of the hollow fibers; and blowing means (16) arranged at the air inlet (12c) of the housing for introducing air into the housing, wherein a ratio between a sum of the cross-sectional areas of the hollow fibers taken along a plane perpendicular to the axis, and the cross-sect

Abstract: A method for separating and recovering oxygen-rich air from the air, comprising, using a gas separation membrane module where a laminate consisting of a permeate-side spacer for forming a permeate gas channel communicated with a hollow section in a core tube for collecting and discharging a permeate gas and two flat-film gas separation membranes sandwiching the spacer and a feed-side spacer for forming a feed gas channel are spirally wound around the core tube such that the laminate and the feed-side spacer are alternately superimposed, vacuuming the hollow section of the core tube to 95 kPaA (absolute pressure) or less by vacuuming means while feeding the air into the feed gas channel by air feed means such that a maximum feed-air flow rate and a maximum static pressure divided by an effective membrane area of the gas separation membrane are 100 m3/min·m2 or less and 4000 Pa/m2 or less, respectively, to separate and recover oxygen-rich air from the hollow section of the core tube.

Abstract: An object of the present invention is to provide a humidifying apparatus capable of improving the humidification efficiency while lowering the pressure loss of gas even when a low-pressure gas is used, and is suitably usable for fuel cells. The present invention relates to a humidifying apparatus for fuel cells, fabricated by loading a hollow fiber membrane element into a container such that the space communicating with the hollow side of the hollow fiber membranes is isolated from the space communicating with the outer side of the hollow fiber membranes, wherein (a) the inner diameter of the hollow fiber membrane is larger than 400 ?m, (b) the water vapor permeation rate (P?H2O) of the hollow fiber membranes is 0.5×10?3 cm3 (STP)/cm2·sec·cm Hg or more, (c) the ratio (P?H2O/P?O2) of the water vapor permeation rate to the oxygen gas permeation rate of the hollow fiber membranes is 10 or more, and (d) the elongation at tensile break of the hollow fiber membranes after hot water treatment in hot water at 100° C.

Abstract: An object of the present invention is to provide a humidifying apparatus capable of improving the humidification efficiency while lowering the pressure loss of gas even when a low-pressure gas is used, and is suitably usable for fuel cells. The present invention relates to a humidifying apparatus for fuel cells, fabricated by loading a hollow fiber membrane element into a container such that the space communicating with the hollow side of the hollow fiber membranes is isolated from the space communicating with the outer side of the hollow fiber membranes, wherein (a) the inner diameter of the hollow fiber membrane is larger than 400 ?m, (b) the water vapor permeation rate (P?H2O) of the hollow fiber membranes is 0.5×10?3 cm3 (STP)/cm2·sec·cm Hg or more, (c) the ratio (P?H2O/P?O2) of the water vapor permeation rate to the oxygen gas permeation rate of the hollow fiber membranes is 10 or more, and (d) the elongation at tensile break of the hollow fiber membranes after hot water treatment in hot water at 100° C.