ELECTROLYTIC APPARATUS

To provide an electrolytic apparatus that prevents the adhesion of scale onto a surface of a cathode in non-diaphragm electrolysis for producing hypochlorous acid.SOLUTION: An electrolytic apparatus 1 comprises an anode 3 and a cathode 4 facing the anode in a non-diaphragm electrolysis tank 2. The a...

Full description

Saved in:
Bibliographic Details
Main Authors MIYAGAWA TATSURO, YOSHIOKA TATSURO
Format Patent
LanguageEnglish
Japanese
Published 10.08.2021
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:To provide an electrolytic apparatus that prevents the adhesion of scale onto a surface of a cathode in non-diaphragm electrolysis for producing hypochlorous acid.SOLUTION: An electrolytic apparatus 1 comprises an anode 3 and a cathode 4 facing the anode in a non-diaphragm electrolysis tank 2. The anode 3 is configured by coating a titanium substrate 5 with an iridium oxide catalyst 6. The cathode 4 is configured by coating the titanium substrate 5 with a polyacrylic acid film 7. Hypochlorous acid can be obtained by electrolyzing salt water while applying a direct-current voltage between the anode 3 and the cathode 4. On the other hand, calcium ions in the salt water are pulled by the cathode 4 to be a calcium carbonate, but are ordinarily deposited as a calcite in the most stable phase. However, a vaterite in a metastable phase is preferentially generated on a surface of the polyacrylic acid film 7 of the cathode 4. A deposited scale naturally and easily falls off because the adhesiveness of a spherical vaterite onto a cathode surface is smaller than that of a rhombohedral calcite. In this way, such an electrolytic apparatus that prevents the adhesion of scale onto the cathode surface can be provided.SELECTED DRAWING: Figure 1 【課題】次亜塩素酸製造のための無隔膜電解において、陰極表面へのスケール付着を防止した電解装置を提供する。【解決手段】電解装置1は、無隔膜電解槽2の中に陽極3と、これに対向する陰極4を備える。陽極3はチタン基体5を酸化イリジウム触媒6で被覆して構成され、陰極4はチタン基体5をポリアクリル酸被膜7で被覆して構成される。陽極3と陰極4に直流電圧を印加して、塩水を電解することで次亜塩素酸が得られる。一方、塩水中のカルシウムイオンは陰極4に引き寄せられ、炭酸カルシウムになるが、通常は最安定相のカルサイトとして析出する。しかし、陰極4のポリアクリル酸被膜7表面では準安定相のバテライトが優先的に生成する。陰極表面への付着性は、菱面体状のカルサイトより球状のバテライトのほうが小さいため、析出したスケールが自然脱落しやすい。これにより陰極表面へのスケール付着を防止した電解装置を提供することができる。【選択図】図1
Bibliography:Application Number: JP20200009589