Decomposition of Ethylene Glycol by Ozone under Ultraviolet Irradiation

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  • 紫外線照射下でのオゾンによるエチレングリコールの分解

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Decomposition of ethylene glycol by ozone under ultraviolet irradiation was studied by changing the concentration of ethylene glycol, that of ozone in the feed gas, and the irradiation intensity of a low pressure mercury lamp.<BR>The overall reaction rate was represented as follows.<BR>where k is rate constant, I is the irradiation intensity of a low pressure mercury lamp, F is the concentration of ozone in the feed gas, and C is that of ethylene glycol. Oxalic acid, glyoxylic acid, glyoxal, glycolaldehyde, formaldehyde and formic acid were detected as decomposition products, and the removal of total organic carbon (TOC) was observed too. Based on the decomposition behavior of ethylene glycol and change of its decomposition products, the decomposition route was estimated.<BR>From the estimation of the decomposition route and the fact that a considerable amount of oxalic acid was produced, it was suggested that the TOC removal via oxalic acid was more important than that via formic acid. The TOC removal was affected by the concentration of ethylene glycol in addition to that of ozone in the feed gas and the irradiation intensity of low pressure mercury lamp.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1988 (5), 763-770, 1988-05-10

    The Chemical Society of Japan

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