SBIR PHASE I: Environmentally Safe Destruction of Chlorinated Aromatic Compounds by a Novel Photothermal Process

9560978 Lavid这个SBIR第一阶段项目提供了一种新的还原光热工艺，用于以环境安全的方式销毁多氯联苯等氯化芳香族化合物。它利用紫外光在中等温度下引发多氯联苯的加氢脱氯，使其完全转化为有价值的碳氢化合物和氯化氢。该过程在氢气的还原气氛中进行，提供了必要的自由基链载体，并绕过了煤烟和有毒氯氧化合物的产生。大量场地受到三氯乙烷、三氯乙烯、四氯乙烯、多氯联苯等氯化危险废物的污染。这些化合物已被广泛使用，它们的存在引起了严重的环境问题。目前所有的补救技术都是不充分的。它们面临着高成本、不完全销毁、有毒产品排放以及处置/责任问题。因此，显然需要拟议的处理这些化合物的新工艺。第一阶段的主要目标是从实验上证明将多氯联苯转化为环境友好产品的可行性。这一目标将通过五个阶段的工作计划来实现。.将采用独特的UV光源，并追求两种专有选择，即单级和两级工艺。将为具有代表性的印刷电路板开发一个详细的动力学模型，计算机预测将为实验工作提供指导。两种具有代表性的多氯联苯的实验将在实验室规模的光热流动反应器中进行。第一阶段的成功完成将为全面的第二阶段提供技术基础，在该阶段将设计、建造和测试一个原型示范单元。这种新的还原光热工艺将为环境安全的芳香族氯代烃(如多氯联苯)的转化带来一种“绿色”技术。它将提供一种独特的、具有成本效益的清理技术，绕过与现有方法相关的所有问题，如成本高、煤烟和其他有毒产品的排放。因此，这将对联邦和州政府以及私营部门的补救努力大有裨益。

9560978 Lavid This SBIR Phase I project offers a novel reductive photothermal process for environmentally safe destruction of chlorinated aromatic compounds such as Polychlorinated Biphenyls (PCBs). It utilizes UV light to photo-initiate hydrodechlorination of PCBs at moderate temperature, leading to their complete conversion into valuable hydrocarbons and HCl. The process is conducted in a reducing atmosphere of hydrogen, providing the necessary radical chain-carriers and circumventing production of soot and toxic oxychlorinated species. A large number of sites are contaminated with chlorinated hazardous wastes such as TCA, TCE, PCE, PCB, etc. These compounds have been widely used and their presence entails severe environmental concerns. All current remedial technologies are inadequate. They suffer from high cost, incomplete destruction, emission of toxic products, and disposal/liability problems. Consequently, there is a clear need for the proposed new process for the treatment of these compounds. The main objective of Phase I is to experimentally demonstrate the feasibility of converting PCBs into environmentally benign products. This objective will be met by a five-stage work plan. .Unique UV light sources will be employed and two proprietary options pursued, single-stage and two-stage processes. A detailed kinetic model for a representative PCB will be developed, and computer predictions will provide guidance to the experimental effort. Experiments with two representative PCBs will be performed in a bench-scale photo-thermal flow reactor. Successful completion of Phase I will provide the technical foundation for a comprehensive Phase II, in which a prototype demonstration unit will be designed, constructed, and tested. This novel reductive photothermal process will lead to a "green" technology for environmentally safe conversion of aromatic chlorohydrocarbons (e.g., PCBs). It will provide a unique and cost-effective clean-up technology circumventing all the problems associ ated with current methods, such as high cost and emission of soot and other toxic products. Consequently, it will be of great benefit to Federal and State governments and to the private sector in their remediation efforts.