Investigation on Regeneration Method of Oxygen Transport Membrane Using a Cobalt (II) Complex
Shosuke YAMANOUCHI* and Kazuhiro OKABE
Osaka R/D Laboratory, Sumitomo Electric Industries, Ltd.; 1-1-3, Shimaya, Konohana-ku, Osaka-shi 554-0024 Japan
This paper discribes the regeneration method of the deteriorated oxygen transport membrane using N,N'-bis (3-methoxysalicylidene) -2-methylpropylenediaminatocobalt (II) with 4-methylaminopyridine as an axial ligand. When the deteriorated complex solution exposed to O2/N2 mixed gas for 140 hours was brought into contact with Zn at 423 K, the O2/N2 selectivity (α) of oxygen transport membrane restored the initial value 110 from 2.2, and Co (II) concentration increased to the initial concentration 0.4 mol L−1 from 0,05 mol L−1. The O2/N2 selectivity (α) of the complex solutions treated with Fe, Mg, Al were 39, 1.5 and 1.5, respectively.
When the deteriorated complex solution, to which 17 wt% of water was added, was heated at 423 K, the O2/N2 selectivity (α) of the complex resored to 115 from 4.1, and the water concentration decreased to the initial concentration, 0.2 wt%. When the deteriorated copmplex solution exposed to air for about 48 hours was brought into contact with Zn at 423 K, the O2/N2 selectivity (α) of the complex solution regenerated to 116 from 2.1 and water concentration decreased from 15.8 wt% to 0.2 wt% It was also shown that the repetitive regeneration of the deteriorated complex solution is attainable by Zn contact.
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