紫外光谱法实时测定新枞酸的氧化动力学研究

Study on the kinetics of oxidation of neoabietic acid using UV-VIS spectroscopy

摘要: 采用了紫外光谱法建立的新枞酸定量分析方法,跟踪测定在连续反应器上的新枞酸氧化反应动力学。在物质的量范围0.6420×10-6³.854×10-6mol内,新枞酸的吸光度（A1）与物质的量（n1）的线性关系是:A1=0.7390×106n1+0.2403。在反应温度25、30、40、50℃下,新枞酸的氧化反应动力学呈现表观一级反应,氧化速率常数分别为0.0024、0.0040、0.0083、0.0168min-1。反应的表观活化能Ea为61.39kJ·mol-1。

Abstract: The method was applied to the analysis of the mole quantities of neoabietic acid by UV Spectrophotometry. The kinetics of oxidation of neoabietic acid was investigated using a continuous experiment apparatus. Results and conclusions drawn were as follows. Firstly, plot of absorption (A1) against the mole quantity (n1) was linear:A1 =0.7390×106n1 +0.2403, in the mole quantity range of 0.6420×10-6³.854×10-6mol. Secondly, the oxidation reaction was first order at 25, 30, 40, 50℃, respectively. The reaction rate constants were 0.0024, 0.0040, 0.0083, 0.0168min-1, respectively. Finally, the reaction activation energy was 61.39kJ·mol-1.