催化湿式过氧化物法(CWPO)降解间硝基苯磺酸钠动力学研究

Kinetics of catalytic wet peroxide oxidation of meta-nitro benzene sulfonic acid sodium salt

为了优化反应条件及研究反应机理,利用不锈钢高压反应釜,采用催化湿式过氧化物法(CWPO)在不同温度、初始总有机碳(TOC)浓度、氧化剂及催化剂条件下对间硝基苯磺酸钠溶液进行降解处理,得到最优条件为温度200℃,初始TOC浓度2560mg/L,氧化剂30mL及催化剂0.5g。并采用Elovich方程和双常数方程对降解过程的单因素动力学数据进行了拟合,并建立了催化湿式氧化降解过程的多因素动力学方程。结果表明,上述方程均能较好地拟合催化湿式氧化的降解过程。同时分析了考察因素对TOC去除率的影响,其影响的顺序为:温度>初始TOC浓度>氧化剂>催化剂。

This paper is aimed at reporting its authors＇ research results on the kinetic nature of catalytic wet peroxide oxidation of metanitro benzene sulfonic acid sodium salt. For the given purpose, we have studied the catalytic wet peroxide oxidation under different temperatures, the initial TOC concentration, oxidant amount and catalyst amount and so on. It is also for the given purpose, we have also selected the optimum reaction conditions, such as the likely-to-be optimum temperature （200 ℃）, the initial TOC concentration （2 560 mg/L）, oxidant amount （30 mL） and the catalyst amount （0.5 g） in view of the practical cost and mild reaction condition. The experimental data of all influential factors concerned with the catalytic wet peroxide oxidation process have also been described with Elovich equation and double-constant equation. In order to further study the reaction mechanism and optimize the reaction conditions, experiments on the catalytic wet peroxide oxidation of refractory wastewater of meta-nitro nenzene sulfonic acid sodium salt have also been performed with a kind of stainless steel autoclave. Then we have established a muhi-factor kinetics model under the deliberately chosen optimum condition. The results of our research have shown that both of the above equations are satisfactory for describing the process of the CWPO with the kinetics model well reflecting the reaction process. In addition, the equations and experimental results prove to be able to provide a theoretical base for practical application and further deep-going studies. And finally, we have analyzed the relative significance of the investigated factors on the removal rate of TOC by using simple methods as well as found the order of the factors＇ order in significance on the initial TOC removal rate, which can be shown as follow： temperature 〉 the concentration of initial TOC 〉 oxidant 〉 catalyst.