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目的:推断并验证大黄、地榆、牡丹皮3味中药炒炭的热解反应机制,进一步完善这3味中药炒炭研究的理论。方法:采用模式函数法中的单个扫描速率的不定温法(Coats-Redfern模型与Achar模型)推断大黄、地榆、牡丹皮3味中药炒炭过程中热解反应的机理函数,通过比较转化率(α)理论值、实验值与1/T的热分析曲线对机理函数进行验证。结果:积分形式表达式能更较好地描述大黄、地榆、牡丹皮3味中药炒炭热解的反应机制,三者的炒炭热解机理函数分别为9号机理函数积分形式g(α)=[(1-α)-1/3-1]2,2号机理函数积分形式g(α)=α+(1-α)ln(1-α),9号机理函数积分形式g(α)=[(1-α)-1/3-1]2。结论:3味中药炒炭的热解反应机制均属于反应扩散,转化率理论值与实验值存在一定的差异,运用热分析动力学方法只是尽可能地模拟这3味中药的炒炭热解反应过程。
OBJECTIVE: To deduce and verify the pyrolysis reaction mechanism of rhubarb, burnet and moutan three traditional Chinese medicinal charcoal to further improve the theory of the three kinds of Chinese herbal charcoal research. Methods: The mechanism function of pyrolysis reaction of Rhubarb, Ulmus pumila and Cortex Moutan in the process of defatting charcoal was deduced by using the method of single-rate scanning at a constant temperature (Coats-Redfern model and Achar model). By comparing the conversion rate (α) theoretical value, experimental value and 1 / T thermal analysis curve to verify the mechanism function. Results: The integral form expression can better describe the reaction mechanism of rhubarb, burnet and moutan three Chinese herbal fried carbon pyrolysis mechanism, the pyrolysis mechanism functions of the three are the integral form of mechanism function g (α ) = [(1-α) -1 / 3-1] The integral form of the mechanism function of the number 2 g (α) = α + (1-α) ln α) = [(1-α) -1 / 3-1] 2. CONCLUSION: The pyrolysis reaction mechanism of the three kinds of Chinese traditional medicine charcoal belongs to the reactive diffusion. The theoretical value of the conversion rate is different from the experimental value. The thermal analysis kinetic method only simulates the pyrolysis reaction of the three kinds of Chinese herbs as much as possible process.