关键词: 微通道反应器, 连续流, 氧化, 传质, 传热

Abstract: At present, the research on synthesis of m-methyl benzoic acid is mainly limited to the intermittent reaction process of the oxidation vessel, and there are few reports on the continuous flow reaction process. In response to this problem, a continuous flow process for the synthesis of m-methyl benzoic acid in liquid-phase oxidation in pulsed hybrid microchannel reactors was proposed. Using m-xylene as the raw material, peracetic acid as the oxidant, cobalt acetate and sodium bromide as catalysts. Through the inspection of the reaction material ratio, the amount of catalyst, the reaction residence time, the reaction temperature and the amount of solvent, etc, the optimum process conditions were obtained. When n(m-xylene):n(peracetic acid):n(cobalt acetate):n(sodium bromide):n(acetic acid)=1:4:0.015:0.02:5, reaction temperature at 120℃, the residence time at 15min, the reaction performance was the best. The results showed that this process takes full advantage of the excellent mass and heat transfer characteristics of the microchannel continuous flow reactor, greatly shortens the reaction time, increases the reaction rate, expands the selection range of the process conditions, increases the safety factor and realizes the effective control of the oxidation reaction process.

Key words: microchannel reactor, continuous flow process, oxidation, mass transfer, heat transfer