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O3/H2O2体系能产生大量自由基,臭氧与自由基的耦合氧化作用能提高苯乙烯的氧化去除效率.采用O3/H2O2氧化高浓度苯乙烯有机废气,研究了臭氧投加量、停留时间、H2O2体积分数、循环液喷淋密度和O3/C8H8摩尔比对苯乙烯去除率的影响.结果表明,O3/H2O2气液两相氧化能高效净化苯乙烯有机废气,苯乙烯去除率可达85.7%.适宜运行条件:停留时间为20.6 s,H2O2体积分数为10%,喷淋密度为1.72 m3·(m2·h)-1,O3/C8H8摩尔比为0.46.采用GC-MS分析O3/H2O2气液两相高级氧化苯乙烯出口气样,研究结果表明苯甲醛(C6H5CHO)和苯甲酸(C6H5COOH)为O3/H2O2氧化苯乙烯的中间产物,并推测出苯乙烯的降解机制.
O3 / H2O2 system can produce a large number of free radicals, and the coupling oxidation of ozone with free radicals can improve the oxidation removal efficiency of styrene.Using O3 / H2O2 to oxidize high concentration styrene organic waste gas, the effects of ozone dosage, residence time, H2O2 Volume fraction, circulating liquid spray density and molar ratio of O3 / C8H8 on the styrene removal efficiency.The results showed that the O3 / H2O2 gas-liquid two-phase oxidation can purify styrene organic waste gas efficiently and the removal rate of styrene can reach 85.7%. The suitable operating conditions were as follows: the residence time was 20.6 s, the volume fraction of H2O2 was 10%, the spray density was 1.72 m3 · (m2 · h) -1 and the molar ratio of O3 / C8H8 was 0.46. The results showed that benzaldehyde (C6H5CHO) and benzoic acid (C6H5COOH) were the intermediates of O3 / H2O2 oxidation of styrene, and the degradation mechanism of styrene was deduced.