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公开(公告)号：JP2002336855A
公开(公告)日：2002-11-26
申请号：JP2001150750
申请日：2001-05-21
Applicant: TORAY INDUSTRIES
Inventor： KITADE TAMOTSU , NAKANISHI TAKAYUKI , KIHARA MASAHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a fresh water generating method and a fresh water generation capable of achieving higher recovery rate when permeated water is obtained by subjecting raw water to membrane treatment. SOLUTION: In the fresh water generating method, sulfate ion concentration is reduced by passing the raw water through a nano filtration membrane A, then the permeated water is passed through a nano filtration membrane B having higher salt removing ratio than the membrane A, further the permeated water is passed through a reverse osmosis membrane to remove salts.
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公开(公告)号：JP2002085941A
公开(公告)日：2002-03-26
申请号：JP2001207607
申请日：2001-07-09
Applicant: TORAY INDUSTRIES
Inventor： NAKANISHI TAKAYUKI , TATEISHI YASUSHI , KIHARA MASAHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a fresh water making process which involves subjecting feed water to membrane treatment to obtain permeate water and enables attainment of a higher recovery ratio of the permeate water (i.e., fresh water), and also to provide a fresh water maker for the process. SOLUTION: This process involves: supplying feed water to pretreatment membrane to obtain pretreated water; and thereafter, supplying the pretreated water to reverse osmosis membrane to obtain permeate water and concentrated water; wherein a portion of the feed water is supplied to the reverse osmosis membrane while bypassing the pretreatment membrane.
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公开(公告)号：JP2001252656A
公开(公告)日：2001-09-18
申请号：JP2000067418
申请日：2000-03-10
Applicant: TORAY INDUSTRIES
Inventor： FUSAOKA YOSHINARI , KIHARA MASAHIRO , HAYASHI KUNIHIKO , MIYOSHI TOSHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a fresh water generating method using reverse osmotic separation by which the generating cost of fresh water from sea water is reduced and besides, a stable operation is enabled for a long period. SOLUTION: In this fresh water generating method from sea water, at least two reverse osmosis membrane module units 2, 4 containing reverse osmosis membrane elements provided in connection in series are used, and sea water is fed to the reverse osmosis membrane module unit 2 and also concentrated sea water obtained from the reverse osmosis membrane module unit 2 at the preceding 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, sea water is treated in such a way that in every reverse osmosis membrane element, a membrane surface flow rate of the feeding sea water is controlled at >=0.03 m/s and also a permeated water quantity per 1 m2 reverse osmosis membrane is in a range of 0.07-1.2 m3/d.
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公开(公告)号：JP2001252539A
公开(公告)日：2001-09-18
申请号：JP2000067412
申请日：2000-03-10
Applicant: TORAY INDUSTRIES
Inventor： KIHARA MASAHIRO , FURUNO SHUJI , OOTO KATSUFUMI
Abstract: PROBLEM TO BE SOLVED: To provide a reverse osmosis composite membrane having a support membrane which can hardly by compacted even in high pressure operation. SOLUTION: A base material 2A, a support membrane 2B having communication holes 2b, and a separation function layer 2C are laminated in turn to form the reverse osmosis composite membrane. When, after a pressure of 5.5 MPa is the thickness direction is applied to the membrane for 3 h and the application is lifted, the average porosity of the support membrane is D0(%), and the average bore diameter is d0 (μm), and after a pressure of 10 MPa in the thickness direction is subsequently applied to the membrane for 3 h and the application is lifted, the average porosity of the support membrane is D1(%), and the average bore diameter is d1 (μm), D0, d0, D1 and d1 simultaneously meet formulas: 0.6
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公开(公告)号：JP2000288542A
公开(公告)日：2000-10-17
申请号：JP28135199
申请日：1999-10-01
Applicant: TORAY INDUSTRIES
Inventor： KIHARA MASAHIRO , MINEGISHI SHINICHI , NAKANISHI TAKAYUKI
Abstract: PROBLEM TO BE SOLVED: To decrease the deterioration of a reverse osmosis membrane due to deformation under the operation condition of high pressure and high density, to make the pressure loss of elements not so large, to prevent the performance deterioration of the elements due to concentration polarization, and to provide a sufficient pressure-resistant property and separation performance. SOLUTION: A unit including a reverse osmosis membrane, a permeated liquid flow passage material, and a supply liquid flow passage material, is disposed around a water collection pipe. The permeated liquid flow passage material is composed of a woven knit fabric having a plurality of grooves, and a water permeable cloth disposed on the surface, having the grooves, of the woven knit fabric. The grooves have a width of 0.1 to 0.2 mm, a depth of 0.05 to 0.2 mm, and a pitch of 18-25 grooves/cm. The supply liquid flow passage material consists of a lattice structure, which has an interval X between the intersection points perpendicular to the axis of the water collection pipe, of 2 to 5 mm, and an interval Y between the intersection points in the axial direction, of 1.0 to 1.8 times X.
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Patent Agency Ranking
公开(公告)号：JP2000288541A
公开(公告)日：2000-10-17
申请号：JP10231099
申请日：1999-04-09
Applicant: TORAY INDUSTRIES
Inventor： KIHARA MASAHIRO , MINEGISHI SHINICHI , NAKANISHI TAKAYUKI
Abstract: PROBLEM TO BE SOLVED: To decrease the deterioration of a reverse osmosis membrane due to deformation under high pressure and high density conditions, to make the pressure loss of elements not so large, to prevent the performance deterioration of the elements due to concentration polarization, and to provide a sufficient pressure-resistant property and separation performance. SOLUTION: In a spiral type reverse osmosis membrane formed by winding a unit comprising a supply liquid flow passage material, two reverse osmosis membranes, and a permeated liquid flow passage material lying between the reverse osmosis membranes, around a hollow water collection pipe having pores on its surface, the permeated liquid flow passage material is composed of woven knit fabric having a plurality of grooves on at least one surface and an average thickness of 0.15 mm or more and 0.4 mm or less, and a water permeable cloth disposed on the surface, having the grooves, of the woven knit fabric and having an average thickness of 0.05 mm or more and 0.2 mm or less, and the supply liquid flow passage material consists of a net-like structure having an interval X between the diagonal lines perpendicular to the water collection pipe, of 2 mm or more and 5 mm or less, an interval Y between the diagonal lines parallel to the water collection pipe, of 1.0 times X or more and 1.8 times X or less, and an average thickness of 0.5 mm or more and 1.0 mm or less.
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公开(公告)号：JP2000288356A
公开(公告)日：2000-10-17
申请号：JP2000024971
申请日：2000-02-02
Applicant: TORAY INDUSTRIES
Inventor： NAKANISHI TAKAYUKI , KIHARA MASAHIRO , TANIGUCHI MASAHIDE
Abstract: PROBLEM TO BE SOLVED: To improve the linear velocity of fluid flowing in membrane surfaces of reverse osmosis membrane elements to suppress concentration polarization and making a reverse osmosis membrane separation apparatus sufficiently exhib capability of the reverse osmosis membrane elements by installing a reverse osmosis membrane module in which a plurality of reverse osmosis membrane elements are connected in series and specifying the cross-section surface area of a raw water flow route of the reverse osmosis membrane elements. SOLUTION: The reverse osmosis membrane part is composed of a module 3 to which a plurality of reverse osmosis membrane elements are boaded. In this case, the reverse osmosis membrane element 1 in the upstream side is made to have a wider cross-section surface area of a raw water flow route than the reverse osmosis membrane element 12 in the downstream side. The raw water passed through a raw water intake route 4 and pressurized by a pressurizing pump 5 and led to the module 3. Consequently, the raw water is subjected to reverse osmosis membrane treatment by the reverse osmosis membrane element 1 and the passed water is taken out through a passed water discharge route 7. The concentrated water which is not passed through the reverse osmosis membrane element 1 is led to the reverse osmosis membrane element 2 and treated by the element 2 and the passed water is discharged through the passed water discharge route 7 and concentrated water is discharged through a concentrated water discharge route 6.
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公开(公告)号：JP2000262867A
公开(公告)日：2000-09-26
申请号：JP7194399
申请日：1999-03-17
Applicant: TORAY INDUSTRIES
Inventor： NAKANISHI TAKAYUKI , KIHARA MASAHIRO , MINEGISHI SHINICHI
Abstract: PROBLEM TO BE SOLVED: To control concentration polarization and to demonstrate enough performance by packing reverse osmosis membrane elements in a reverse osmosis membrane module in series in the passage direction of raw water and setting up the thickness of a passage material on the raw water side to meet a specified relation. SOLUTION: Reverse osmosis membrane elements 1, 2 are packed in series in a reverse osmosis membrane module 3, and raw water 4 supplied from a high pressure pump 5 is separated into concentrated water 6 and filtrate 7. Each of the elements 1, 2 is composed at least of a reverse osmosis membrane 9, a raw water passage material 10, a filtrate passage material 11, and a filtrate catchment pipe 12. The thickness of the material 10 is set up within 0.2-2.0 mm to obtain the filtrate 7 efficiently. Namely, the value of (the raw water passage material thickness of the element 1 arranged on the side of a module inlet)/(the raw water passage material thickness of the element 2 arranged on the side of a module outlet) is set up, for example, at 1.05 or above.
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公开(公告)号：JPH11253762A
公开(公告)日：1999-09-21
申请号：JP8297798
申请日：1998-03-13
Applicant: TORAY INDUSTRIES , TORAY ENG CO LTD
Inventor： TANIGUCHI MASAHIDE , ONOE TOSHIJI , KIHARA MASAHIRO , OKADA HIROMICHI
Abstract: PROBLEM TO BE SOLVED: To manufacture easily a hollow yarn membrane module wherein one end of a hollow yarn membrane freely swings by a method wherein in the hollow yarn membrane module comprising a plurality of hollow yarn membranes, a sectional area at a free end part of the hollow yarn membrane is made smaller than a sectional area in an outer peripheral standard of the other part of the hollow yarn membrane. SOLUTION: A hollow yarn membrane module comprises a plurality of hollow yarn membranes 1, and has a sealed end part 2, a potting part 3 and a water- collecting part 4. In this case, a sectional area at a free end part (a sealed end part 2) of the hollow yarn membrane 1 is made smaller than sectional area in an outer peripheral reference of the other part of the hollow yarn membrane 1. As the sectional area at the free end part 2 to the sectional area in an outer peripheral reference of the other part of the hollow yarn membrane 1, the sectional area necessary for sealing the free end part 2 of the hollow yarn membrane 1 is nequired, the sectional area at the free end part 2 is preferably at most two times the practical hollow yarn membrane sectional area. When sealed, a method of deforming the hollow yarn membrane 1 with pressure is desirable.
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公开(公告)号：JPH11239718A
公开(公告)日：1999-09-07
申请号：JP4361498
申请日：1998-02-25
Applicant: TORAY INDUSTRIES
Inventor： TANIGUCHI MASAHIDE , ONOE TOSHIJI , KIHARA MASAHIRO
Abstract: PROBLEM TO BE SOLVED: To easily produce a hollow fiber membrane module in which one end of a hollow fiber membrane moves freely. SOLUTION: In a method for producing a hollow fiber membrane module which comprises a plurality of hollow fiber membranes 1 and has a fixed end part and a sealed free end part, the membranes 1 are adhesion-fixed in an opened state, to the opening parts in the hollow fiber membranes, a filler 6 is packed in the membranes and cured, and an adhesion-fixed parts are removed to make the free end part. In this way, the hollow fiber membrane module suitable for the treatment of raw water containing various pollutants such as sewage treatment and drainage treatment can be produced easily.
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