公开(公告)号：EP1029583A4

公开(公告)日：2002-06-19

申请号：EP99925385

申请日：1999-06-18

Applicant: TORAY INDUSTRIES

Inventor： KIHARA MASAHIRO ,  MINEGISHI SHINICHI ,  NAKANISHI TAKAYUKI

IPC: B01D61/02 ,  B01D63/10 ,  B01D63/12 ,  B01D65/00 ,  B01D61/08 ,  B01D61/10

CPC classification number: B01D65/00 ,  B01D61/022 ,  B01D63/10 ,  B01D63/12 ,  Y02A20/131

Abstract: A spiral reverse osmosis membrane element of the present invention includes a plurality of bag-shaped reverse osmosis membranes, permeated liquid passage members arranged inside the reverse osmosis membranes, and a plurality of feed liquid passage members interposed between the reverse osmosis membranes, those membranes and passage members being wound around an outer surface of a hollow pipe in a manner that only the interiors of the reverse osmosis membranes communicate with through-holes formed in the surface of the hollow pipe. Each of the feed liquid passage members is a mesh member having series of quadrilateral meshes formed by a plurality of linear members crossing each other. Two opposite cross-points out of four cross-points of each of the quadrilateral meshes are in line in parallel with an axial direction of the hollow pipe. And relations 2mm ≤ X ≤ 5mm and X ≤ Y ≤ 1.8X are both satisfied where X denotes a distance between the cross-points in a direction perpendicular to the axial direction of the hollow pipe and Y denotes a distance between the cross-points in the axial direction of the hollow pipe.

公开(公告)号：JP2002282855A

公开(公告)日：2002-10-02

申请号：JP2001095160

申请日：2001-03-29

Applicant: TORAY INDUSTRIES

Inventor： NAKANISHI TAKAYUKI ,  KITADE TAMOTSU ,  KIHARA MASAHIRO

IPC: C02F1/44 ,  B01D61/02 ,  B01D61/14 ,  B01D61/58

Abstract: PROBLEM TO BE SOLVED: To provide a method and equipment for producing water capable of achieving a higher recovery rate with a NF(nano-filtration) membrane having a suitable desalination performance when treating a seawater in a membrane process to obtain a permeated water. SOLUTION: A seawater is supplied to a NF membrane module using a nano filtration membrane (NF membrane) whose sulphate ion extraction coefficient is at least 90%, its NF membrane module is so operated as to allow calcium extraction coefficient to be 35% or less and the calcium ion concentration in a concentrated water to be 965 mg/L or less, and a permeated water is pressurized and is treated with a reverse osmosis membrane module to obtain a desalinated water.

公开(公告)号：JP2002079246A

公开(公告)日：2002-03-19

申请号：JP2001173608

申请日：2001-06-08

Applicant: TORAY INDUSTRIES

Inventor： TATEISHI YASUSHI ,  KIHARA MASAHIRO ,  NAKANISHI TAKAYUKI ,  MURAKAMI MUTSUO

IPC: C02F1/44 ,  B01D61/04 ,  B01D69/10 ,  B01D71/56 ,  C08G69/26 ,  C08J5/22

Abstract: PROBLEM TO BE SOLVED: To provide a water making method capable of making water in high recovery while suppressing the generation of scale on the surface of a membrane. SOLUTION: Raw water is supplied to an ion separation membrane to obtain permeated water and this permeated water is supplied to a reverse osmosis membrane. In this case, the pH of raw water is controlled to 2-5 and 10% or more of monovalent ions contained in raw water are permeated through the reverse osmosis membrane to remove not less than 90% of divalent or more metal ions contained in raw water and/or divalent or more ions capable of being bonded to divalent or more metal ions.

公开(公告)号：JP2001252660A

公开(公告)日：2001-09-18

申请号：JP2000067423

申请日：2000-03-10

Applicant: TORAY INDUSTRIES

Inventor： MIYOSHI TOSHIRO ,  HAYASHI KUNIHIKO ,  FUSAOKA YOSHINARI ,  KIHARA MASAHIRO

IPC: C02F1/44 ,  B01D61/02 ,  B01D61/12 ,  B01D61/58

Abstract: PROBLEM TO BE SOLVED: To provide a fresh water generating method using reverse osmotic separation which enables reduction in water generating cost. SOLUTION: Sea water is fed to a reverse osmosis membrane unit containing reverse osmosis membrane elements to separate concentrated sea water and obtain permeated water. In this case, a portion of the concentrated sea water is added to the feeding sea water of the reverse osmosis membrane module unit and also, while the pressure higher by 0.5-5 MPa than osmotic pressure of the feeding sea water is always applied to the reverse osmosis membrane, sea water is treated to generate fresh water.

公开(公告)号：JP2001252659A

公开(公告)日：2001-09-18

申请号：JP2000067422

申请日：2000-03-10

Applicant: TORAY INDUSTRIES

Inventor： MIYOSHI TOSHIRO ,  HAYASHI KUNIHIKO ,  FUSAOKA YOSHINARI ,  KIHARA MASAHIRO

IPC: C02F1/44 ,  B01D61/02 ,  B01D61/12 ,  B01D61/58

Abstract: PROBLEM TO BE SOLVED: To provide a fresh water generating method using reverse osmotic separation by which the water generating cost is reduced and deterioration of water quality of fresh water is prevented. SOLUTION: In this fresh water generating method, at least two reverse osmosis membrane module unites 2, 4 containing reverse osmosis membrane elements provided by connecting in series, are provided and sea water is fed to the reverse osmosis membrane module unit at the initial stage, and also concentrated sea water obtained from the reverse osmosis membrane module unit 2 at the front stage is fed to the reverse osmosis membrane module unit 4 at the succeeding stage, and then permeated water is obtained from respective stages. In this case, while back pressure is applied to a permeated water side of the reverse osmosis membrane at the front stage, the concentrated sea water obtained from the front stage is raised in pressure by a turbocharger 8 provided between the preceding stage and the post stage, and then is fed to the post stage.

公开(公告)号：JP2001252540A

公开(公告)日：2001-09-18

申请号：JP2000067413

申请日：2000-03-10

Applicant: TORAY INDUSTRIES

Inventor： KIHARA MASAHIRO ,  OOTO KATSUFUMI ,  FURUNO SHUJI

IPC: B01D69/12 ,  B01D61/02 ,  B01D63/12 ,  B01D71/56 ,  B01D71/68 ,  C02F1/44 ,  C08J5/18

Abstract: PROBLEM TO BE SOLVED: To provide a reverse osmosis composite membrane which can produce a large mount of filtrate without causing the lowering of water quality even during operation under a pressure of at least 7.0 MPa. SOLUTION: In the reverse osmosis composite membrane 3 in which a support membrane 2B in which communication holes 2b are distributed and a separation function layer 2C are formed in turn on the surface of a porous base material 2A, when the average porosity and average bore diameter of the support membrane 2B are Ds(%) and ds (μm) respectively, and the average porosity and average bore diameter of the base material 2A are Db(%) and db (μm) respectively, Ds, ds, Db, and as simultaneously satisfy 40

公开(公告)号：JP2001252537A

公开(公告)日：2001-09-18

申请号：JP2000067410

申请日：2000-03-10

Applicant: TORAY INDUSTRIES

Inventor： KIHARA MASAHIRO ,  OOTO KATSUFUMI ,  FURUNO SHUJI

IPC: B01D69/12 ,  B01D61/02 ,  B01D63/10 ,  B01D71/56 ,  B01D71/68 ,  C02F1/44 ,  C08J7/04

Abstract: PROBLEM TO BE SOLVED: To provide a reverse osmosis composite membrane which does not cause the lowering of separation performance and a fresh water generation ratio with the compaction of a support membrane and the deformation of a separation function layer controlled even in high pressure operation. SOLUTION: In the reverse osmosis composite membrane, a base material 2, the support membrane 2B having communication holes 2b, and the separation function layer 2C are laminated in turn. When an optional position in the thickness direction of the support membrane 2B is X, and the diameter of the communication hole at the position X is Y (μm), X and Y meet formula: 0.3X+0.01

公开(公告)号：JP2001129365A

公开(公告)日：2001-05-15

申请号：JP31531499

申请日：1999-11-05

Applicant: TORAY INDUSTRIES

Inventor： TANIGUCHI MASAHIDE ,  FURUNO SHUJI ,  KIHARA MASAHIRO

IPC: B01D61/12 ,  B01D61/02 ,  B01D61/08 ,  C02F1/44

Abstract: PROBLEM TO BE SOLVED: To provide a method for operating a reverse osmosis device capable of controlling or regulating conditions of plant operation while monitoring the level of bromine or boron in the permeated water obtained from a reverse osmosis module. SOLUTION: In focussing on a particular relationship between the salt permeation coefficient P in the permeated water calculated by means of reverse osmosis and the permeation coefficient PB of the particular ingredient (for example, boron) in the permeated water, the condition of the plant operation is controlled or regulated in accordance with the assumed concentration of boron CBP obtained by assuming the concentration of boron CBP in the permeated water from the concentration of salt CP in the permeated water. For example, when the boron concentration is high in the permeated water, the operation pressure is raised as well as the number of operation lines of reverse osmosis elements is reduced to thereby obtain a permeated water meeting the standard value of the water quality.

公开(公告)号：JP2000051668A

公开(公告)日：2000-02-22

申请号：JP23656399

申请日：1999-08-24

Applicant: TORAY INDUSTRIES

Inventor： KIHARA MASAHIRO ,  YAMAMURA HIROYUKI ,  NISHIMURA KAZUHIKO

IPC: B01D63/00 ,  B01D61/08 ,  B01D63/08

Abstract: PROBLEM TO BE SOLVED: To provide a liquid separation element capable of ensuring a permeated liquid flow channel sufficient even under high pressure and excellent in properties such as a permeate flow rate, an obstruction ratio, an exclusion ratio or a concn. ratio and durability. SOLUTION: In a liquid separation element, a membrane unit including reverse osmosis membranes 1 and a permeated liquid flow channel material 10 having grooves of which the groove width is smaller than the thickness of the reverse osmosis membrane is formed to the periphery of a center pipe having water collecting holes and the exclusion ratio of salt after a supply soln. of 25 deg.C containing 5.0 wt.% of salt supplied for 2 hr while pressure is set to 13 MPa and a flow rate is set to 20 l/min is not less than the exclusion ratio of salt after 2 hr-supply under a condition wherein pressure is 5.5 MPa and a flow rate is 20 l/min.

公开(公告)号：JP2000051667A

公开(公告)日：2000-02-22

申请号：JP23656299

申请日：1999-08-24

Applicant: TORAY INDUSTRIES

Inventor： KIHARA MASAHIRO ,  YAMAMURA HIROYUKI ,  NISHIMURA KAZUHIKO

IPC: B01D63/00 ,  B01D61/08 ,  B01D63/08

Abstract: PROBLEM TO BE SOLVED: To provide a liquid separation element capable of ensuring a permeated liquid flow channel sufficient even under high pressure and excellent in properties such as a permeate flow rate, an obstruction ratio, an exclusion ratio or a concn. ratio and durability. SOLUTION: A membrane unit including reverse osmosis membranes 1 and a permeated liquid flow channel material 10 having grooves of which the groove width is smaller than the thickness of the reverse osmosis membrane and characterized by that a flow resistance value measured under static water pressure within a range of 0.5-10 MPa is within a range of 0.31-0.63 MPa/3/day is wound around a center pipe having water collecting holes.