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。其中一些包括吸附、焚烧和生物降解。具有中等有机浓度(1-30%)的含水废流可能过于稀释而不适合经济地焚烧，而对于通过吸附或生物降解进行处理则可能过于浓缩。对于这样的蒸气，超临界水中的氧化是一种潜在的替代技术。因此，含水废水中存在的危险有机化学品可以转化为二氧化碳和水。这项工作的目的是了解超临界水中危险有机废物的氧化动力学，以用于此类工艺的设计和开发。苯酚、萘、氯苯和醋酸在超临界水中会被氧化。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-质谱仪。考察产物产率和反应物转化率随反应停留时间的变化，有利于反应路径的解析和反应动力学的确定。该项目将提供实际工程进展的机会，以及在理解超临界流体中的化学反应过程方面的根本性进展。

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.