Abstract: A separation membrane module (1A) includes: a tubular pressure container (7); a plurality of separation membrane elements (2) inserted in the pressure container (7) and each having a first end member (3) and a second end member (4); and a sealing member (5A) mounted on one of or both the first end member (3) and the second end member (4) that are adjacent to each other. In a normal condition, the sealing member (5A) is located radially inward of a maximum diameter portion of the first end member (3) and/or the second end member (4) on which the sealing member (5A) is mounted. The sealing member (5A) is deformed due to contact between the adjacent separation membrane elements (2) or due to supply of a pressurized liquid into the pressure container (7), and comes into close contact with an inner circumferential face (7a) of the pressure container (7).

Abstract: Provided are a connection member capable of preventing leakage from a supply side to a permeating side from occurring by a simple means; and a separation membrane module using the connection member. The connection member (20) is used to connect in series a plurality of separation membrane elements equipped with end surface holding members (36) and to install the separation membrane elements in a pressure-resistant vessel (38). The connection member (20) is characterized in that, when the separation membrane elements are connected to each other, the connection member is engaged with respective grooves (36b) of the end surface holding members (36) adjacent to each other.

Abstract: A separation membrane module (1A) includes: a tubular pressure container (7); a plurality of separation membrane elements (2) inserted in the pressure container (7) and each having a first end member (3) and a second end member (4); and a sealing member (5A) mounted on one of or both the first end member (3) and the second end member (4) that are adjacent to each other. In a normal condition, the sealing member (5A) is located radially inward of a maximum diameter portion of the first end member (3) and/or the second end member (4) on which the sealing member (5A) is mounted. The sealing member (5A) is deformed due to contact between the adjacent separation membrane elements (2) or due to supply of a pressurized liquid into the pressure container (7), and comes into close contact with an inner circumferential face (7a) of the pressure container (7).

Abstract: Provided are a connection member capable of preventing leakage from a supply side to a permeating side from occurring by a simple means; and a separation membrane module using the connection member. The connection member (20) is used to connect in series a plurality of separation membrane elements equipped with end surface holding members (36) and to install the separation membrane elements in a pressure-resistant vessel (38). The connection member (20) is characterized in that, when the separation membrane elements are connected to each other, the connection member is engaged with respective grooves (36b) of the end surface holding members (36) adjacent to each other.

Abstract: Provided are a pressure vessel for a membrane element in which the membrane element can be easily mounted, a membrane filtration apparatus equipped with the pressure vessel for a membrane element, and a method for manufacturing a membrane filtration apparatus. A rail (protrusion) 60 is formed on the inner circumferential surface of the pressure vessel 40 in such a manner that a ridge line 61 extends along the insertion direction of the membrane element. Consequently, the membrane element 10 can be inserted into the pressure vessel 40 so as to be in a sliding contact onto the ridge line 61 of the rail 60 formed on the inner circumferential surface of the pressure vessel 40. Therefore, the frictional resistance can be reduced as compared with conventional ways, so that the membrane element 10 can be easily mounted onto the pressure vessel 40.

Abstract: Provided is a process for continuously producing a composite reverse osmosis membrane comprising a polyamide skin layer and a porous support for supporting the polyamide skin layer, the method comprising: A) applying an aqueous solution ? containing a compound having two or more reactive amino groups to form a covering layer of an aqueous solution on the porous support while moving the porous support; B) permeating the aqueous solution ? in micro pores of the porous support by holding the covering layer on the porous support for 0.2 to 15 seconds; C) removing the covering layer while holding the aqueous solution ? within the micro pores of the porous support; and D) forming the polyamide skin layer by applying an organic solution ? containing a polyfunctional acid halide onto the surface of the porous support to make the aqueous solution ? contact the organic solution ? for interfacial polymerization.

Abstract: A reverse osmosis membrane that has alkali resistance, and therefore can maintain high boron rejection performance even at high pH region, and a method for producing the membrane are disclosed. The reverse osmosis membrane has an initial performance that a rate of change Rf (%) determined by the following equation is within ±10%: Rf(%)=((F1-F0)/F0)×100 wherein F0 is a permeation flux (m3/(m2/day)) at the initiation of operation when a sodium hydroxide aqueous solution adjusted to pH 12.0 as raw water is continuously circulated at 25° C. under pressure of 0.75 MPa, and F1 is permeation flux (m3/(m2/day)) after one week operation.

Abstract: A composite semipermeable membrane which combines the high ability to reject salts and a high permeation flux and is especially excellent in the ability to reject uncharged substances, and a process for producing the semipermeable membrane are disclosed. The process comprises forming on a surface of a porous supporting film a thin film comprising a polyamide resin obtained by reacting a polyfunctional amine ingredient with a polyfunctional acid ingredient in the presence of at least an alkali metal hydroxide and an organic acid.