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Apparatus for electrolyzing sulfuric acid and method for electrolyzing sulfuric acid

a technology of electrolyzing apparatus and sulfuric acid, which is applied in the direction of electrolysis process, electrolysis components, cells, etc., can solve the problems of increasing the transportation cost of chemical products compared with concentrated sulfuric acid, requiring a large amount of equipment cost, so as to achieve safe and high current efficiency , the effect of high current efficiency

Inactive Publication Date: 2013-12-19
DE NORA PERMELEC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an apparatus and method for electrolyzing sulfuric acid which can produce dilute sulfuric acid with controlled temperature, concentration, and high-current efficiency. This results in the production of electrolyte containing high concentrations of oxidizing agent. The prior art has not been able to achieve this efficient production of oxidizing agent.

Problems solved by technology

Generally speaking, however, sulfuric acid commercially available is concentrated sulfuric acid at the density of 98% or 96%, and therefore when sulfuric acid diluted to that of a low density, which is called dilute sulfuric acid is to be supplied to the apparatus for electrolyzing sulfuric acid, the chemicals supply equipment of the plant must have an exclusive storage tank as additional unit and supply piping, requiring a large amount of equipment cost.
In addition, sulfuric acid of a low concentration is larger in volume compared with concentrated sulfuric acid, and the transportation cost of the chemical will be increased compared with that of concentrated sulfuric acid.
However, there is no disclosure in the methods described in PTLs 1˜3 about the controlling method for concentration of sulfuric acid, although it is disclosed that electrolyzing low concentration sulfuric acid gives a high current efficiency.
For this reason, if exhaust from the tank or equipment controlling the concentration of sulfuric acid is introduced to exhaust facilities or a scrubber without any treatment, sulfuric acid enters the exhaust facilities or the scrubber, which causes problems of corrosion or performance degradation.
In this method, however, sulfuric acid used for cleaning supplied at a low concentration is re-concentrated and therefore, the cleanliness is not uniform and the safety is problematic.

Method used

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  • Apparatus for electrolyzing sulfuric acid and method for electrolyzing sulfuric acid
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  • Apparatus for electrolyzing sulfuric acid and method for electrolyzing sulfuric acid

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example 1

[0146]The experiment was conducted using the apparatus for electrolyzing sulfuric acid and the method for electrolyzing sulfuric acid shown in FIG. 1 and FIG. 2. For the anode 3 and the cathode 6 incorporated in the electrolytic cell 2, a conductive diamond electrode was applied, which was prepared in such a way that diamond provided with conductivity by boron doping was coated on a 200 mm φ silicon substrate. Current density was 100 A / dm2. For both the anode side and the cathode side, the sulfuric acid temperature and concentration control process was as follows, in which concentrated sulfuric acid was diluted with pure water to prepare dilute sulfuric acid of the specified temperature and the specified concentration.

[0147]The procedures for the anode side were as follows.

[0148]1) Pure water was supplied from the anode side pure water supply pipe 10 to the anode side tank 31 and stored. Feed amount of the pure water was weighed by using an ultrasonic integrating flow meter, which i...

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Abstract

The present invention relates to an apparatus to produce oxidizing agent-rich sulfuric acid by electrolysis of sulfuric acid. More specifically, it relates to the apparatus by which dilute sulfuric acid of the specified temperature and concentration is formed within the electrolysis system and then, by electrolysis of the formed dilute sulfuric acid, electrolytic sulfuric acid containing richly oxidizing agent is formed at a high efficiency and safely under the temperature control.The apparatus for electrolyzing sulfuric acid and the method for electrolyzing sulfuric acid by the present invention comprise the anode side dilute sulfuric acid generation loop A in which concentrated sulfuric acid, as feed material, is diluted and controlled to the specified temperature and concentration, and the anode side electrolytic sulfuric acid generation loop B in which electrolytic sulfuric acid is formed by electrolysis of dilute sulfuric acid with the temperature and concentration controlled to the specified range in the anode side dilute sulfuric acid generation loop A, in, at least, the anode side electrolysis part of the apparatus for electrolyzing sulfuric acid having the anode side electrolysis part and the cathode side electrolysis part.

Description

TECHNICAL FIELD[0001]The present invention relates to an apparatus for electrolyzing sulfuric acid and a method for electrolyzing sulfuric acid for producing oxidizing agent-rich electrolytic sulfuric acid through electrolysis of sulfuric acid.[0002]More in detail, the present invention relates to the apparatus for electrolyzing sulfuric acid and the method for electrolyzing sulfuric acid for producing electrolytic sulfuric acid containing oxidizing agent at a high efficiency and safely in such a manner that dilute sulfuric acid for which temperature and concentration are controlled is formed in the apparatus for electrolyzing sulfuric acid and the temperature- and concentration-controlled dilute sulfuric acid is electrolyzed.BACKGROUND ART[0003]Conventionally, persulfuric acid has been used in various manufacturing and inspection processes as chemical agent, such as pre-treatment agent for electrolytic metal plating, etching agent, oxidizing agent in chemical and mechanical polishi...

Claims

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Application Information

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IPC IPC(8): C25B1/22C25B15/02
CPCC25B15/02C25B11/12C25B15/08C25B1/22C25B11/043C25B1/28
Inventor DOMON, HIROKIFUJII, KOUJIKOSAKA, JUNKOKATO, MASAAKI
Owner DE NORA PERMELEC LTD
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