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    CLEANING AGENT, CLEANING LIQUID AND CLEANING METHOD FOR AROMATIC POLYAMIDE REVERSE OSMOSIS MEMBRANES
    1.
    发明公开
    CLEANING AGENT, CLEANING LIQUID AND CLEANING METHOD FOR AROMATIC POLYAMIDE REVERSE OSMOSIS MEMBRANES 审中-实审

    公开(公告)号：EP4410406A1

    公开(公告)日：2024-08-07

    申请号：EP22875387.7

    申请日：2022-03-16

    申请人： Kurita Water Industries Ltd.

    发明人： FUJII, Akihiro ,  Wong Xin Yee

    IPC分类号： B01D61/10 ,  B01D65/06 ,  B01D71/56 ,  C11D17/08 ,  C11D1/02 ,  C11D3/20 ,  C11D3/26 ,  C11D3/34 ,  C11D3/36

    CPC分类号： B01D61/10 ,  B01D65/06 ,  B01D71/56 ,  C11D1/02 ,  C11D3/20 ,  C11D3/26 ,  C11D3/34 ,  C11D3/36 ,  C11D17/08

    摘要： The present invention provides a cleaning agent, a cleaning liquid, and a cleaning method, which are capable of effectively removing a contaminant that is not able to be sufficiently removed by conventional cleaning liquids in cases where aromatic polyamide reverse osmosis membranes used in water treatments are contaminated and the performances of the aromatic polyamide reverse osmosis membranes such as the permeation flux and the desalination rate are deteriorated. The present invention provides a cleaning agent for aromatic polyamide reverse osmosis membranes, the cleaning agent being composed of an aqueous solution which has a pH of 13 or more and contains a stabilized halogen, a chelating agent that contains one or more substances selected from among aliphatic carboxylic acids containing no amino group, phosphonic acid compounds containing no amino group, polyphosphoric acids, and salts thereof, and an alkaline agent. According to the present invention, an aromatic polyamide reverse osmosis membrane is cleaned with use of a cleaning liquid that is composed of an aqueous solution of this cleaning agent. A chloramine compound which is obtained by mixing a compound having a primary amino group with hypochlorous acid and/or a hypochlorite is suitable for use as the stabilized halogen.

    METHOD FOR IMPROVING EFFICIENCY OF HEAT TRANSMISSION BY STEAM
    2.
    发明公开
    METHOD FOR IMPROVING EFFICIENCY OF HEAT TRANSMISSION BY STEAM 审中-实审

    公开(公告)号：EP4365333A1

    公开(公告)日：2024-05-08

    申请号：EP22832482.8

    申请日：2022-03-16

    申请人： Kurita Water Industries Ltd.

    发明人： WATANABE, Kazuya ,  KOIZUMI, Masakazu

    IPC分类号： C23F11/02 ,  F26B21/00 ,  F28B1/02 ,  F28B1/06 ,  F28F21/08

    CPC分类号： F26B21/00 ,  F28B1/02 ,  F28F21/08 ,  C23F11/02 ,  F28B1/06

    摘要： Provided is a method for improving efficiency of heat transmission that enables improving the efficiency of heat transmission by steam in a steam system at a pH of less than 7. A method for improving the efficiency of heat transmission by steam, wherein, in a step of introducing steam into a heat exchanger to heat an object to be heated or a step of contacting the steam with a cooling body to liquefy the steam, a sarcosine compound is allowed to be present in the steam system at a pH of less than 7. As the sarcosine compound, a long-chain sarcosine compound represented by the following formula (I) is preferable. R1C(=O)-N(CH3)-(CH2)n-COOR2 ... (I) In formula (I), R1 is an unsaturated or saturated linear or branched hydrocarbon group having 7 to 24 carbon atoms, n is an integer of 0 to 2, and R2 is a hydrogen atom or a salt-forming group.

    PLATING PRETREATMENT METHOD FOR ABS RESIN SURFACE, PLATING TREATMENT METHOD FOR ABS RESIN SURFACE, AND ABS RESIN PLATED PRODUCT
    7.
    发明公开
    PLATING PRETREATMENT METHOD FOR ABS RESIN SURFACE, PLATING TREATMENT METHOD FOR ABS RESIN SURFACE, AND ABS RESIN PLATED PRODUCT 审中-公开

    公开(公告)号：EP3677703A1

    公开(公告)日：2020-07-08

    申请号：EP18849843.0

    申请日：2018-08-31

    申请人： Kurita Water Industries Ltd. ,  JCU Corporation

    发明人： NAGAI Tatsuo ,  YAMAMOTO Yuzuki ,  YAMAMOTO Taibou ,  HASHIMOTO Yasuo ,  IZUMITANI Miyoko

    IPC分类号： C23C18/24 ,  C25B1/00 ,  C25D5/56

    摘要： A treatment device 1 has: a treatment tank 2 provided with a constant temperature heater 3 on the outer periphery; an electrolytic cell 6 continuing from a pipe 4 provided with a circulation pump 5; and a pipe 7 for supply to the treatment tank 2 from the electrolytic cell 6. Within the electrolytic cell 6 are provided a positive electrode 6A and a negative electrode 6B formed from diamond electrodes and a bipolar electrode 6C disposed between the two. The treatment tank 2 and the electrolytic cell 6 are filled with a prescribed concentration of sulfuric acid. The treatment device is configured such that a persulfate solution S such as peroxydisulfuric acid is generated by electrolysis of the sulfuric acid by making a prescribed current flow from a direct current power supply unit to the positive electrode 6A and the negative electrode 6B, and this persulfate solution S can be supplied to the treatment tank 2 via the pipe 7. A plating pretreatment method for Cr and Mn-free ABS resin surfaces that can form plating sufficiently adhering to an ABS resin surface can be applied to this treatment device 1.