公开(公告)号：US20220371887A1

公开(公告)日：2022-11-24

申请号：US17755613

申请日：2020-11-06

申请人： Minoru TERADA ,  EVATEC CO., LTD.

发明人： Minoru TERADA

IPC分类号： C01B11/04 ,  B01J39/07 ,  B01J49/53

摘要： Provided is a method for preparing a hypochlorous acid aqueous solution by which a weakly acidic hypochlorous acid aqueous solution having a pH of about 3.5-7 can be obtained without substantially generating chlorine gas even immediately after regeneration or even with a new weakly acidic cation exchange resin. In a method for preparing a hypochlorous acid aqueous solution wherein an aqueous solution of hypochlorite is brought into contact with a weakly acidic cation exchanger to exchange a cation constituting the hypochlorite with hydrogen ions to increase the concentration of hypochlorous acid in the aqueous solution, a neutral salt solution of a strong acid and a strong base in an amount that may obtain the hypochlorous acid aqueous solution having a pH of at least 3.5 when the hypochlorite aqueous solution is brought into contact with the weakly acidic cation exchanger is brought into contact, prior to the contact between the hypochlorite aqueous solution and the weakly acidic cation exchanger, with a weakly acidic cation exchanger that has been regenerated or has not been substantially subjected to cation exchange.

公开(公告)号：US20230406703A1

公开(公告)日：2023-12-21

申请号：US18250849

申请日：2020-10-30

申请人： EVATEC CO., LTD.

发明人： Minoru TERADA

IPC分类号： C01B11/04

CPC分类号： C01B11/04 ,  C02F1/50

摘要： The subject is to provide a method and apparatus for producing hypochlorous acid solution of high concentration in a simple and easy manner without generating chlorine gas in principle. In the present invention to solve the above problem, an acidic aqueous solution with a pH of 1.5 to 5 and an aqueous solution containing hypochlorous acid aqueous solution are separately and independently prepared respectively, and both aqueous solutions are mixed to obtain hypochlorous acid water with a pH of 5 to 7.