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Polychlorinated aromatic heavy component run time and temperature graph
Polychlorinated aromatic hydrocarbons are chemically stable and can persist for years, decades, or even longer in environmental media such as water bodies, soils, and sediments. As they are widely used, they pose a growing problem for human health and the environment. Threatened. The first batch of 12 controlled chemicals of the three categories published by the UNEP “Holiday Convention on Persistent Organic Pollutants (PoPs)†are chlorinated aromatic organic compounds. In the past, polychlorinated aromatic hydrocarbons were treated by incineration. Dioxins may be generated during the incineration process, causing serious harm to the environment. This has been banned by the state. Therefore, it is urgent to develop clean and environmentally friendly treatment processes.
Domestic and foreign R&D teams all try to treat polychlorinated aromatics by gas-phase catalytic hydrogenation, but the gas-solid catalytic hydrogenation process requires high temperatures, poor catalyst activity, complex hydrogenation products, and severe carbon deposition. It is difficult to substantively solve the urgent environmental problems facing the industry. In particular, the polychlorinated aromatic heavy components have the characteristics of a highly symmetrical structure and a high boiling point. Most of them exist in the form of solids, and the required gasification temperature is extremely high, and it is difficult to achieve vapor-phase feeding in the process.
Recently, Yin Hongfeng, a researcher at the Institute of New Energy Technology of the Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, and an industrial catalysis team led by Zhou Shenghu have developed a process and catalyst suitable for all polychlorinated aromatic hydrodechlorination technologies.
Zhou Shenghu creatively proposed the process of hydrocatalytic hydrodegradation of polychlorinated aromatic heavy components by hot feed liquid, and successfully solved the key problem of polychlorinated aromatic heavy components dissolved at room temperature and difficult to feed. Through the selection of suitable organic solvents and the development of new hydrodechlorination catalysts, the reaction pressure of hydrogen at 170-250°C is 1.5-3.0 MPa, and the space velocity of polychlorinated aromatics feed is 0.07-0.15 h-1. The polychlorinated aromatics are cleanly and efficiently converted to harmless cyclohexane, the reaction conversion rate is greater than 95%, and the selectivity of hydrodechlorination products is 100%. The 500-hour stability test of this project has been successfully completed. The continuous liquid turbulent bed hydrogenation process and the hydrogenation catalyst run stably. The catalyst has a large operating temperature space. The process has a large amount of polychlorinated aromatic hydrocarbons and a high selectivity for hydrogenation products, can cleanly and efficiently treat polychlorinated aromatic hydrocarbons, and has significant environmental and social benefits.
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