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化学学报
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化学学报 ›› 2001, Vol. 59 ›› Issue (12): 2132-2137. 上一篇    下一篇

研究论文

较快一级化学反应的热动力学研究法: 热弛豫法

孟祥光;曾宪诚;程四清;陈勇   

  1. 四川大学化学学院.成都(610064);后勤工程学院油料应用工程系
  • 发布日期:2001-12-15

Thermokinetic research method for faster first-order reactions: The thermal relaxation method

Meng Xiangguang;Zeng Xiancheng;Cheng Siqing;Chen Yong   

  1. Sichuan Univ, Coll Chem.Chengdu(610064)
  • Published:2001-12-15

PDF

354

被引次数

1

分析了非稳态传热情况下热导式热量计的动态性能，通过对输出信号的剖析，建立了热导式热量计冷却常数的经验动态模型。通过对热弛豫现象的分析，建立了可用于研究快速化学反应的热动力学研究法-热弛豫法，应用此种量热研究法可用于研究速率常数小于5s^-^1的一级化学反应。研究了25℃下乙酸甲酯、甲酸乙酯和甲酸甲酯在水溶液中的皂化反应，其计算结果与文献值相吻合，从而验证了热弛豫法的正确性。

关键词: 热动力学, 弛豫, 乙酸甲酯, 甲酸乙酯, 甲酸甲酯, 皂化作用

The transient heat transport property of conduction calorimeter is dissected and the experimental time-dependent cooling constant model of the conduction calorimeter is established in this paper. The thermal relaxation method proposed in this paper can be used to determine the faster reactions whose first-order rate constant could be less than 5 s^-^1 with the calorimetric technique. In order to test the validity of this method, the saponification of methyl acetate, ethyl formate and methyl formate in aqueous solution at 25℃ has been studied. The rate constants calculated with this method are in agreement with those in the literatrues. Therefore, the thermal relaxation method is believed to be correct.

Key words: THERMODYNAMICS, RELAXATION, METHYLACETATE, ETHYL FORMATE, FORMIC ETHER, SAPONIFICATION

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