NHPI催化分子氧氧化α-O-4型木质素模型分子

发布时间：2018-05-16 01:23

  本文选题：N-羟基邻苯二甲酰亚胺(NHPI) + 催化氧化　； 参考：《精细化工》2017年12期

【摘要】：以苄基苯基醚为模型分子,氧气为氧化剂,考察了N-羟基邻苯二甲酰亚胺(NHPI)对分子氧氧化木质素醚键(α-O-4)的催化作用和多种可溶性过渡金属盐的助催化作用,探究了NHPI和硝酸铜用量、反应温度、反应时间和氧气分压对反应的影响。结果表明:NHPI催化分子氧氧化苄基苯基醚生成苯甲醛和苯酚,在可溶性的钴、锰、镍和铜盐中,铜盐对NHPI的助催化作用最好。在NHPI/Cu(NO3)2催化下,当氧分压高于0.5 MPa时,苄基苯基醚的氧化反应对氧气为0级。过高温度会加剧目标产物苯甲醛和苯酚的深度氧化。优化的工艺条件为,以乙酸为溶剂,n(苄基苯基醚)∶n(NHPI)∶n(硝酸铜)=1.0∶0.2∶0.02,氧气分压为1.0 MPa时,在110℃下反应15h,苄基苯基醚的转化率为37.2%。
[Abstract]:Using benzyl phenyl ether as model molecule and oxygen as oxidant, the catalytic effects of N-hydroxyphthalimide (NHPI) on molecular oxygen oxidation of lignin ether bond (伪 -O-4) and various soluble transition metal salts were investigated. The effects of the amount of NHPI and copper nitrate, reaction temperature, reaction time and partial pressure of oxygen on the reaction were investigated. The results show that the molecular oxygen oxidizes benzyl phenyl ether to benzaldehyde and phenol. Among the soluble cobalt, manganese, nickel and copper salts, copper salts have the best catalytic effect on NHPI. Under the catalysis of NHPI/Cu(NO3)2, when the partial pressure of oxygen is higher than 0.5 MPa, the oxidation reaction of benzyl phenyl ether to oxygen is of 0 order. Excessive temperature will aggravate the deep oxidation of benzaldehyde and phenol. The optimum technological conditions were as follows: when acetic acid was used as solvent, benzyl phenyl ether (benzyl phenyl ether) was used as solvent, the conversion rate of benzyl phenyl ether was 37.2 when the reaction was carried out at 110 鈩，

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