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该文讨论了四乙酰乙二胺(TAED)/H2O2体系和单一H2O2体系分别与木素模型物(乙酰香兰酮)的反应动力学方程。2种系统中氧化乙酰香兰酮的反应都是一级反应。在TAED/H2O2体系中,一级反应速率常数k为0.34min-1,半衰期t1/2为2min;而单一H2O2体系中,k为0.0035min-1,半衰期t1/2为220min。因此,TAED/H2O2体系氧化乙酰香兰酮的速率比单一H2O2体系快约100倍。同时还分析了TAED/H2O2体系漂白针叶木TMP时,为了增加过氧乙酸的生成,起始pH为11左右;为了减少H2O2的降解,终了pH应为7,这样的反应条件有利于提高反应效率和速率。
This paper discusses the reaction kinetics of tetraacetyl ethylenediamine (TAED) / H2O2 system and single H2O2 system with lignin (acetovan). Oxidation of acentricone in both systems was a first order reaction. In TAED / H2O2 system, the first-order reaction rate constant k is 0.34min-1 and the half-life t1 / 2 is 2min. In single H2O2 system, k is 0.0035min-1 and the half-life t1 / 2 is 220min. Therefore, the TAED / H2O2 system oxidizes acetonum about 100 times faster than a single H2O2 system. At the same time, it was also analyzed that when the TED / H2O2 system bleached softwood TMP, in order to increase the generation of peracetic acid, the initial pH was about 11; in order to reduce the degradation of H2O2, the final pH should be 7, so the reaction conditions are beneficial to improve the reaction efficiency And rate.