亜リン酸の液相酸化における二酸化硫黄の作用 : 酸素-二酸化硫黄混合ガスによる亜リン酸の液相酸化 (第1報)

概要

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Aqueous oxidation of phosphorous acid by dissolved oxygen proceeds very slowly, but when sulfur dioxide is coexistent with oxygen gas, cooperative oxidation processes for both sulfurous acid and phosphorous acid proceed quickly in aqueous solution. Though sulfur dioxide itself is a popular reducing agent, it affects like the oxidizing agent as if. This somewhat strange phenomenon is investigated mainly from a stoichiometrical point of view. An aqueous solution of 0.1 ∼ 1 mol / dm3 H3PO3 is oxidized by oxygen gas containing 0 ∼ 5 volume% SO2 under the condition of pH4.5 and 80 °C. Addition of 1 volume% SO2 increases the oxidation rate as high as 10 times than without SO2, but the oxidation rate of phosphorous acid does not pass over that of SO2 itself. Hydrogen peroxide generated during the oxidation of SO2 by oxygen is attributed to the oxidation of phosphorous acid.
社団法人資源・素材学会の論文
2002-01-25