Hydrothermal Oxidation of Di-n-butylphthalate: Product Distribution and Reaction Mechanisms
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- 作者：Jude A. Onwudili ; Paul T. Williams
- 刊名：Energy & Fuels
- 出版年：2007
- 出版时间：May 2007
- 年：2007
- 卷：21
- 期：3
- 页码：1528 - 1533
- 全文大小：183K
- 年卷期：v.21,no.3(May 2007)
- ISSN：1520-5029
文摘
Di-n-butylphthalate, (DNBP) a ubiquitous environmental pollutant, has been decomposed under hydrothermalconditions between 300 and 380 
tities/deg.gif">C in a batch reactor for 1 h. The reactions were carried out to monitor theeffects of reaction temperature, oxidant concentration, and concentration of DNBP on the decompositionmechanism and product distribution. Generally, the oxidation of DNBP and its decomposition products increasedwith increasing temperature. At zero or lower hydrogen peroxide concentration, DNBP was hydrolyzed bywater-catalyst to produce mainly residual benzoic acid which was formed from o-phthalic acid, a labileintermediate product. Other compounds found included phthalic anhydride, butylbenzoate, acetylbenzoate,1-butanol, and 2-butanol. Effectively, the decomposition/oxidation of DNBP was limited by the resistance ofbenzoic acid to degradation. The same trend was noticed when the concentration of DNBP was varied; ahigher concentration of the compound produced higher initial concentration of benzoic acid and less carbondioxide. For example, only 66.8 wt % of the carbon content of 105.0 mg L-1 of DNBP was obtained ascarbon dioxide compared to 94.5 wt % when 10.5 mg L-1 was reacted using 6 wt % of oxidant.
tities/deg.gif">C in a batch reactor for 1 h. The reactions were carried out to monitor theeffects of reaction temperature, oxidant concentration, and concentration of DNBP on the decompositionmechanism and product distribution. Generally, the oxidation of DNBP and its decomposition products increasedwith increasing temperature. At zero or lower hydrogen peroxide concentration, DNBP was hydrolyzed bywater-catalyst to produce mainly residual benzoic acid which was formed from o-phthalic acid, a labileintermediate product. Other compounds found included phthalic anhydride, butylbenzoate, acetylbenzoate,1-butanol, and 2-butanol. Effectively, the decomposition/oxidation of DNBP was limited by the resistance ofbenzoic acid to degradation. The same trend was noticed when the concentration of DNBP was varied; ahigher concentration of the compound produced higher initial concentration of benzoic acid and less carbondioxide. For example, only 66.8 wt % of the carbon content of 105.0 mg L-1 of DNBP was obtained ascarbon dioxide compared to 94.5 wt % when 10.5 mg L-1 was reacted using 6 wt % of oxidant.