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91.发明申请公开(公告)号：US20200016544A1
公开(公告)日：2020-01-16
申请号：US16497476
申请日：2017-09-15
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Keijirou TADA
Abstract: A hollow fiber membrane filtration device includes a hollow fiber membrane module including a vessel that includes a treated water outlet and a concentrated water outlet, hollow fiber membranes, an upper end fixing member that fixes upper end parts of the hollow fiber membranes, a permeated water chamber that is formed on an upper side of the upper end fixing member, a water conduit through which raw water is supplied into the vessel, and a diffusion tube that is provided on a lower side of the hollow fiber membranes. A plurality of ejection holes are provided on a side peripheral surface of the water conduit. A raw water pipe and gas introduction device are connected with the water conduit. A drainage port is provided at a lower part of the vessel.
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92.发明授权公开(公告)号：US10443023B2
公开(公告)日：2019-10-15
申请号：US15509683
申请日：2015-10-01
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Takahiro Kawakatsu , Kazuki Ishii
Abstract: Provided are a cleaning agent and a cleaning liquid that prevent a reduction in the rejection rate of an RO membrane which may occur when the RO membrane is cleaned and a method for cleaning an RO membrane with the cleaning liquid. The agent for cleaning an RO membrane includes a urea derivative. The urea derivative preferably includes urea (H2N—CO—NH2) and/or biuret (H2N—CO—NH—CO—NH2). The cleaning liquid is an aqueous solution produced by diluting the cleaning agent. The method for cleaning an RO membrane uses the cleaning liquid. Urea and biuret have a structure analogous to amide bonds included in aromatic polyamide RO membranes, and have a strong affinity for amide bond portions. Urea and biuret adsorb onto the amide bond portions, and prevent the amide bonds from being broken by the cleaning liquid.
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公开(公告)号：US10384966B2
公开(公告)日：2019-08-20
申请号：US15115493
申请日：2015-01-26
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Mizuyuki Sakai , Yukimasa Shimura
IPC: C11D3/37 , C11D7/26 , C02F5/10 , C11D3/20 , B08B3/04 , B08B3/02 , F22B37/52 , C11D11/00 , C08F120/06 , C08L33/02 , C23F14/02
Abstract: Provided are a method for removing scale and a scale remover that can efficiently remove scale deposited inside a boiler can or the like in an addition amount of chemicals permissible in terms of cost without corroding a boiler, particularly can efficiently remove scale deposited inside a boiler can even in a facility operated with feed water containing high-concentration iron. A method for removing scale deposited in a system of a steam generating facility, wherein polyacrylic acid having a weight-average molecular weight of more than 20,000 and 170,000 or less and/or a salt thereof is added to feed water of the steam generating facility. When the feed water contains iron, polymethacrylic acid having a weight-average molecular weight of more than 1,000 and 100,000 or less and/or a salt thereof is further added in combination.
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公开(公告)号：US20190232229A1
公开(公告)日：2019-08-01
申请号：US16332493
申请日：2017-03-09
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Yoichi MIYAZAKI , Yuichiro WADA , Kouichi NAGATA
CPC classification number: B01D61/48 , B01D61/46 , B01D2313/10 , B01D2313/12 , C02F1/469 , C02F1/4695 , Y02A20/134
Abstract: Inflow branch pipes of water to be treated, which are branched from an inflow line of the water to be treated, which is provided on an upper side of desalination chambers of an electrodeionization apparatus, communicate with the desalination chambers, respectively. Both ends of the inflow line of the water to be treated are opened, and a supply pipe of the water to be treated communicates with each of the ends so that the water to be treated can be supplied from both sides. In addition, in a lower side of each of the desalination chambers, outflow pipes of treated water, communicate with each other, and these outflow pipes each join an outflow line of the treated water. In addition, both ends of the outflow line of the water to be treated are opened so that the treated water can be discharged from both sides. According to such an electrodeionization apparatus, it is possible to suppress an increase in a differential pressure during passage of water.
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公开(公告)号：US20190144314A1
公开(公告)日：2019-05-16
申请号：US16310589
申请日：2017-06-27
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Qian LIN , Yukimasa SHIMURA
Abstract: The present invention provides a deoxidizing agent for boilers excellent in an oxygen removal effect under wide temperature conditions. The deoxidizing agent for boilers comprises (A) a hydroxylamine compound represented by the following general formula (I), (B) a heterocyclic compound having an N-substituted amino group, and (C) an aminophenol derivative represented by the following general formula (II), wherein R1 and R2 each independently represent an alkyl group having 1 to 5 carbon atoms; wherein R3 to R6 each independently represent any one of (a) the following general formula (III), (b) —OR10 and (c) —R11, at least one of R3 to R6 representing (a), and R10 and R11 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; wherein R7 represents a single bond or an alkylene group having 1 to 4 carbon atoms, and R8 and R9 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
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Patent Agency Ranking
公开(公告)号：US10179745B2
公开(公告)日：2019-01-15
申请号：US14760635
申请日：2013-10-18
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Yukitaka Matsumoto , Nobuhiro Orita , Hideki Kobayashi
IPC: B01D61/42 , C02F1/46 , C02F1/42 , C02F1/72 , B01D61/58 , C02F9/00 , C02F1/467 , C02F1/461 , B01D61/44 , C02F1/469 , C02F1/68 , C25B1/26 , C02F1/20 , C02F1/66 , C02F101/16 , C02F101/38
Abstract: A water recovery system can treat water in a confined space. The wastewater treatment system includes a cation-exchange device in which water to be treated, such as wastewater originating in a space station, water discharged by the human body, water produced by condensing water vapor contained in the air, is directly introduced to a cation-exchange resin and thereby treated by cation exchange; a diamond-electrode electrolysis device in which organic substances, urea, and other nitrogen compounds contained in water discharged from the cation-exchange device are decomposed; a catalytic decomposition device in which the residual organic component is brought into contact with a catalyst to be decomposed; an electrodialysis device in which water discharged from the catalytic decomposition device is treated by electrodialysis to produce desalted water as well as an acid and an alkali; and a mineral adding device in which a mineral is added to the desalted water.
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公开(公告)号：US20180370825A1
公开(公告)日：2018-12-27
申请号：US16064860
申请日：2016-09-20
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Yasuhiro OOI , Keijirou TADA , Akihiro FUJII
Abstract: Provided are a method and an apparatus for clarifying industrial water that enable industrial water to be clarified to a high degree with a small amount of coagulant instead of an inorganic coagulant, such as PAC, aluminum sulfate, or ferric chloride, which need to be used in a large amount for clarifying industrial water and are capable of producing treated water having qualities particularly suitable for an RO membrane treatment. The method for clarifying industrial water includes adding a melamine-formaldehyde resin acid colloidal solution to industrial water in order to coagulate the industrial water and subsequently filtering the coagulated water. The coagulated water may be directly filtered with a pressure or gravity filtration device, or with a microfiltration or ultrafiltration membrane module, without being subjected to solid-liquid separation using a sedimentation or floatation separation device prior to the filtration treatment.
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公开(公告)号：US10083769B2
公开(公告)日：2018-09-25
申请号：US15030781
申请日：2014-10-20
Inventor： Shingo Miyamoto , Mamoru Iwasaki , Mami Hirose , Motohiro Aizawa , Nobuyuki Ota , Takako Sumiya , Kazushige Ishida
Abstract: In an electrodeposition treatment of an iron-group metal ion-containing liquid, without being influenced by the properties of the iron-group metal ion-containing liquid, iron-group metal ions are efficiently removed from the liquid by precipitation. An anode chamber 2A provided with an anode 2 and a cathode chamber 3A provided with a cathode 3 are separated from each other by a cation exchange membrane 5, an iron-group metal ion-containing liquid is charged into the anode chamber 2A, a cathode liquid is charged into the cathode chamber 3A, and by applying the voltage between the anode 2 and the cathode 3, iron-group metal ions in the liquid in the anode chamber 2A are moved into the liquid in the cathode chamber 3A through the cation exchange membrane 5, so that an iron-group metal is precipitated on the cathode 3.
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公开(公告)号：US10056248B2
公开(公告)日：2018-08-21
申请号：US14903538
申请日：2014-06-23
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Haruyoshi Yamakawa
IPC: G01N21/00 , H01L21/02 , G01N21/33 , B08B3/04 , C25B1/30 , C25B9/00 , C25B15/02 , C25B15/08 , G01N21/25 , H01L21/67 , H01L21/66 , G01N21/27
CPC classification number: H01L21/02057 , B08B3/04 , C25B1/30 , C25B9/00 , C25B15/02 , C25B15/08 , G01N21/255 , G01N21/274 , G01N21/33 , G01N2201/127 , H01L21/67017 , H01L21/6704 , H01L21/67253 , H01L22/10
Abstract: To allow online monitoring of the overall concentration of oxidizing substances in electrolyzed sulfuric acid, for example, in a cleaning system, absorbance data having undergone baseline correction in relation to the overall concentration of oxidizing substances by using a standard sample liquid in the form of an electrolyzed sulfuric acid preparation liquid having the same sulfuric acid concentration as the sulfuric acid concentration of the electrolyzed sulfuric acid is prepared, and absorbance is measured over wavelengths ranging from 190 to 290 nm by using a sample liquid in the form of electrolyzed sulfuric acid having a sulfuric acid concentration ranging from 60 to 97% by mass and a liquid temperature ranging from 20 to 70° C. to measure the overall concentration of oxidizing substances in the electrolyzed sulfuric acid on the basis of the data. The overall concentration of oxidizing substances in the electrolyzed sulfuric acid can thus be immediately measured.
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公开(公告)号：US20180215637A1
公开(公告)日：2018-08-02
申请号：US15935850
申请日：2018-03-26
Applicant: KURITA WATER INDUSTRIES LTD.
Inventor： Mizuyuki SAKAI , Yukimasa SHIMURA
Abstract: A scale remover that efficiently removes scale deposited inside a boiler without corroding a boiler includes polyacrylic acid and polymethacrylic acid and/or salts thereof.
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