Oxidation in Supercritical Water: Reaction Pathways and Kinetics (REU Supplement)

目前正在使用几种技术来安全处理危险废物。其中包括吸附、焚烧和生物降解。中等有机浓度（1-30%）的含水废物流可能太稀，无法进行经济的焚烧，也可能太浓，无法通过吸附或生物降解处理。超临界水氧化是一种潜在的替代技术。因此，存在于含水废物流中的危险有机化学物质可以转化为二氧化碳和水。这项工作的目的是了解危险有机废物在水处理厂氧化的动力学，以用于此类工艺的设计和开发。苯酚、萘、氯苯和乙酸在污水中会被氧化。氧化反应将在流动反应器中进行，产物将通过高效液相色谱、气相色谱和气相色谱质谱分析。研究产物产率和反应物转化率随反应器停留时间的变化将有助于确定反应途径和确定反应动力学。该项目将为实际工程进展提供机会，并为理解超临界流体中的化学反应过程提供基础进展。

Several technologies are in use for the safe treatment of hazardous wastes. Some of these include adsorption, incineration, and biodegradation. Aqueous waste streams with moderate organic concentrations (1-30%) may be too dilute for economical incineration and too concentrated for treatment by adsorption or biodegradation. For such streams oxidation in supercritical water (SCW) is a potential alternative technology. Hazardous organic chemicals present in aqueous waste streams can thus be converted to carbon dioxide and water. This work is aimed at understanding the kinetics of the oxidation of hazardous organic wastes in SCW to be used in the design and development of such processes. Phenol, naphthalene, chlorobenzene and acetic acid will be oxidized in SCW. The oxidation reactions will be conducted in a flow reactor and the products will be analyzed by high performance liquid chromatography, gas chromatography, and gas chromatography mass spectrometry. Examining the variation of the products' yields and the reactant conversion with the reactor residence time will facilitate resolution of the reaction pathways and determination of the reaction kinetics. The project will provide opportunities for practical engineering advances as well as fundamental advances in understanding chemical reaction processes in supercritical fluids.