对二甲苯液相催化氧化新工艺  

New process for p-xylene liquid-phase catalytic oxidation

作　　者：赵志翔[1] 潘鹤林[1] 司改改 王有才[1] 束铭杰 

机构地区：[1]华东理工大学化工学院,上海200237

出　　处：《应用化工》2017年第7期1359-1361,1365,共4页Applied Chemical Industry

摘　　要：提出一种对二甲苯(PX)催化氧化新工艺。研究以纳米粒子CeO_2为催化剂,水为溶剂,含臭氧的空气为氧化剂,在85℃时对二甲苯液相催化氧化过程。主要考察温度、催化剂、臭氧浓度、反应时间等因素对PX转化率和各氧化产物选择性的影响。结果表明,对二甲苯和纳米粒子CeO_2的摩尔比为278.6∶1,臭氧浓度65 mg/L,溶剂水75 mL,反应时间8.5 h,气体流量0.5 L/min,反应温度85℃,对二甲苯转化率为13.6%,对甲基苯甲酸选择性高达86.2%。若溶剂由水变为冰醋酸,可以显著增加氧化深度,使对甲基苯甲酸中甲基进一步转化为醛基。A new process of p-xylene catalytic oxidation was proposed. Nano particle CeO2 as catalyst,water as solvent,ozone-air mixture as oxidant,process of p-xylene oxidation at 85 ℃ was studied. Effect of different factors such as temperature,catalyst,ozone concentration,reaction time on the reaction was investigated. Results showed that p-xylene was oxidized with 13. 6% conversion and 86. 2% selectivity for ptoluic acid at 85 ℃ under 65 mg/L of ozone concentration for 8 h at the gas flow rate of 0. 5 L/min when the mole ratio of p-xylene and nano particle CeO2 was 278. 6∶ 1. If the solvent was changed from water to glacial acetic acid,the oxidation depth could increase significantly so that the methyl in p-toluic acid could be further oxidized to aldehyde group.

关 键 词：纳米粒子CeO2 对甲基苯甲酸 臭氧 对二甲苯 

分 类 号：TQ245.1[化学工程—有机化工]