化学
催化作用
氧化剂
硫酸
氧气
磷钼酸
醋酸
产量(工程)
氮氧化物
无机化学
核化学
有机化学
材料科学
燃烧
冶金
作者
Xi Long,Li-Ming Song,Feng Guo,Di Wen
摘要
BACKGROUND Quinclorac (3,7-dichloro-8-quinolinecarboxylic acid) is commercially produced from the partial oxidation of 3,7-dichloro-8-(chloromethyl)quinolone by nitric acid in 98% sulfuric acid. Such technology suffers from some shortcomings, such as the discharge of NOx and wastewater, and the formation of nitro compounds. Oxygen is a clean, cheap oxidant. The key to realizing the production of quinclorac by oxidizing 3,7-dichloro-8-(chloromethyl)quinolone with oxygen is the development of an efficient catalyst. RESULTS The transformation of 3,7-dichloro-8-(chloromethyl)quinolone to quinclorac oxidized by O2 molecule in acetic acid solution can be accomplished under a homogeneous catalyst system composed of H3PMo12O40/Ce/Co/Br. Experiments show that the optimal catalytic system consists of 0.209 (wt)% phosphomolybdic acid, 0.022 (wt)% Ce(III), 0.027 (wt)% Co(II) and 0.0161 (wt)% Br−. CONCLUSION Temperature is an important parameter affecting reaction rate. The influence of oxygen concentration in the gas phase on quinclorac yield and 3,7-dichloro-8-(chloromethyl)quinolone conversion is great. The activation energy of this catalytic reaction is 57.6 kJ mol−1. The reaction orders for oxygen and 3,7-dichloro-8-(chloromethyl)quinolone are 0.26 and 0.93, respectively. © 2022 Society of Chemical Industry (SCI).
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