Effects of Guanidine on the Liquid-Phase Catalytic Oxidation of p-Xylene to Terephthalic Acid
Effects of Guanidine on the Liquid-Phase Catalytic Oxidation of p-Xylene to Terephthalic Acid
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DOI：
10.1021/ie050810p
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发表时间：
2005-09
影响因子：
4.2
通讯作者：
Youwei Cheng;Xi Li;Qinbo Wang;Lijun Wang
中科院分区：
文献类型：
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作者：
Youwei Cheng;Xi Li;Qinbo Wang;Lijun Wang
在以前的论文[Wang，Q.;李，X.;王，L.;郑玉; Xie，G. Ind.Eng.Chem.Res.2005，44（2），261 - 266; 2005，44（13），4518 - 4522]，提出并测试了Co-Mn-Br催化的对二甲苯液相氧化的集总动力学方案和分数动力学模型，并研究了水对氧化反应动力学的影响。本文研究了胍类催化剂添加剂对Co-Mn-Br催化体系上对二甲苯液相氧化制对苯二甲酸反应的影响。在气液两相充分混合的半间歇氧化反应器中进行了四种胍组成的实验。结果表明，胍的加入明显促进了第二位甲基的氧化。然而，对于第一甲基的氧化，存在最佳胍组合物w 0。当胍的组成低于w 0时，第一个甲基的氧化速率随胍的含量增加而增加。
In previous papers [Wang, Q.; Li, X.; Wang, L.; Cheng, Y.; Xie, G. Ind. Eng. Chem. Res. 2005, 44 (2), 261−266; 2005, 44 (13), 4518−4522], a lumped kinetic scheme and a fractional kinetic model for the liquid-phase oxidation of p-xylene catalyzed by Co−Mn−Br was proposed and tested and the effect of water on the oxidation reaction kinetics was investigated. In this paper the effect of guanidine catalyst additive on the liquid-phase oxidation of p-xylene to terephthalic acid over Co−Mn−Br catalyst system was studied. Experiments on four levels of guanidine composition were carried out in a semibatch oxidation reactor where the gas and liquid phases were well mixed. The results show that the addition of guanidine apparently accelerates the oxidation of the second methyl group. However, for the oxidation of the first methyl group there is an optimal guanidine composition w0. When the composition of guanidine is lower than w0, the oxidation rates for the first methyl group increase with the increase of guanidi...