Development of a Dissolved Oxygen Monitoring System for Corrosion Control of Salt Producing Plants

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  • Yashiro Hitoshi
    Department of Chemistry and Bioengineering, Faculty of Engineering, Iwate University
  • Araki Kei
    Department of Chemistry and Bioengineering, Faculty of Engineering, Iwate University
  • Myung Seung-Taek
    Department of Chemistry and Bioengineering, Faculty of Engineering, Iwate University
  • Suzuki Eiich
    Department of Chemistry and Bioengineering, Faculty of Engineering, Iwate University

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  • 製塩プラントにおける腐食管理のための溶存酸素モニタリング法の開発
  • セイエン プラント ニ オケル フショク カンリ ノ タメ ノ ヨウゾン サンソ モニタリングホウ ノ カイハツ

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Abstract

A dissolved oxygen monitoring system has been developed for better control of corrosion problems in salt producing plants. The limiting current density for the reduction of oxygen on a rotating Pt electrode is determined for flowing solutions sampled out from plant lines. The current density is then converted into relative oxygen concentration referring to the current densities for both deoxygenated and fully erated sample solutions. The oxygen concentration in the fully aerated sample solution can be estimated satisfactorily using alting-out parameters, which allows convenient determination of absolute concentration of dissolved oxygen in the sample. The activity of Pt electrodes can be maintained in an enhanced condition by the cyclic polarization anodically to 0.7 V (Ag/AgCl). The existence of Cu2+ in the synthetic brine above 1 ppm interferes with the oxygen analysis, electrodepositing on Pt during the cathodic polarization. Meanwhile, the anodic current peak for the stripping of the deposited Cu can be used for determination of Cu2+ in the solution. During the cathodic reduction of oxygen dissolved in the brine containing Fe2+ above 1 ppm, Fe(OH)2 deposited on the Pt electrode due to the surface alkalization. It causes a serious interference with the oxygen reduction reaction. Ni2+ ion up to 5 ppm showed a scare effect on the electroreduction of oxygen on the rotating Pt electrode. These detrimental effects could be eliminated using a cation exchange method.

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