Conversion of manganate to permanganate

C - Chemistry – Metallurgy – 25 – B

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C25B 1/28 (2006.01) C25B 15/08 (2006.01) H05K 3/00 (2006.01)

Patent

CA 2003997

An electrolytic oxidation process for producing alkali metal permanganate from alkali metal manganate, and particularly for effecting such production to regenerate a permanganate working bath, such as used in desmearing, etch-back or cleaning processes in the manufacture of printed circuits, which has reached a level of decreased working efficiency, wherein an aqueous alkaline solution of manganate in alkali metal hydroxide is electrolytically oxidized using a non-sacrificial anode and a cathode comprised of an alkali-resistant cathode electrode immersed in a concentrated aqueous solution of sodium hydroxide in a container porous to ions which is formed from ion-porous polymeric membrane material.

Divulgation d'un procédé d'oxydation électrolytique pour la production de permanganate de métal alcalin à partir de manganate de métal alcalin, et particulièrement pour effectuer cette production de permanganate afin de régénérer un bain de permanganate en service, tels que ceux utilisés dans les procédés de démarbrage, de gravure en retrait et de nettoyage lors de la fabrication de circuits imprimés, qui a perdu un certain niveau d'efficacité; dans lequel une solution aqueuse alcaline de manganate et d'hydroxyde de métal alcalin est oxydée électrolytiquement à l'aide d'une anode non consommable et d'une cathode comprenant une électrode cathodique, résistante aux alcalis, immergée dans une solution aqueuse concentrée d'hydroxyde de sodium contenue dans un récipient poreux aux ions, qui est formé à partir d'une membrane polymère poreuse aux ions.

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