A quantitative investigation of the reaction of ozone with p-toluenesulfonic acid in aqueous solution as a model compound for anionic detergents
A quantitative investigation of the reaction of ozone with p-toluenesulfonic acid in aqueous solution as a model compound for anionic detergents
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作为阴离子洗涤剂模型化合物，对水溶液中臭氧与对甲苯磺酸反应的定量研究
DOI：
10.1016/0043-1354(80)90017-2
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发表时间：
1980
期刊：
影响因子：
--
通讯作者：
S. Eberle
中科院分区：
文献类型：
--
作者：
P. Joy;E. Gilbert;S. Eberle
研究了臭氧与对甲苯磺酸在初始pH为3和12的水溶液中(25°C)的反应，初始浓度为1 mmoL L−1，臭氧投加量分别为24 mg−11和11 mg−11。底物消除遵循零级速率定律。98%对甲苯磺酸还原时，每摩尔对甲苯磺酸至少需要7摩尔臭氧，然而，要脱除100%对甲苯磺酸，臭氧消耗增加到每摩尔对苯二甲酸16摩尔臭氧。此时，DOC降低了28%，COD降低了74%。臭氧流量越大，PTA分解越快，但臭氧比消耗也增加。确定了以下化合物为氧化产物，并测定了它们随臭氧氧化时间的变化规律：乙二醛、醋酸、甲酸、丙酮酸、草酸、硫酸和过氧化氢。副产物中草酸被鉴定出来。在pH值为12时，观察到乳酸作为进一步的氧化产物。碳、硫和甲基的平衡以及酸当量表明一个或多个中间体带有磺酸基团。这些比例约为20%的中间体在100%消除PTA后消失。根据这些结果，对反应机理进行了讨论。
The reaction of ozone withp-toluenesulfonic acid (PTA) at initial pH 3 and 12 in aqueous solutions (25°C) has been studied at initial concentration 1 mmol l−1and ozone dose is 24 mg min−11. and 11 mg min−11. respectively. The substrate elimination follow a zero order rate law. A 98%p-toluenesulfonic acid reduction requires at least 7 mol O3per mol PTA, however to remove 100% PTA the consumption of ozone increases to 16 mmol O3per mmol PTA. At this point a 28% reduction of DOC and a 74% COD reduction was achieved.The PTA decomposition is quicker at higher ozone flow rate, but the specific ozone consumption increases also. As oxidation products the following compounds were identified and their quantitative variations as function of ozonation time were measured: methylglyoxal, acetic acid, formic acid, pyruvic acid, oxalic acid, H2SO4and H2O2. As byproduct mesoxalic acid was identified. At pH 12 lactic acid as a further oxidation product was observed.Balances of carbon, sulfur and methyl as well of the acid equivalents indicate one or more intermediates with a sulfonic acid group. These intermediates with a proportion of about 20% disappear after 100% PTA elimination. On account of these results a reaction mechanism is discussed.