Acta Phys. -Chim. Sin. ›› 1993, Vol. 9 ›› Issue (05): 675-678.doi: 10.3866/PKU.WHXB19930519

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Investigation on Dehydration of Calcium Oxalate Monohydrate by Correlative Judging Method

Cheng Qing-Tang; Li Jing-Hua; Lou Xiang-Dong   

  1. Department of Chemistry, Henan University, Xinixang 453002
  • Received:1992-02-01 Revised:1992-08-12 Published:1993-10-15
  • Contact: Cheng Qing-Tang

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Abstract: The kinetic parameters and mechanism of dehydration of CaC_2O_4·H_2O have been studied by correlative judging method on the basis of thermogravimetry experiments. Results show that thermal dehydration of CaC_2O_4·H_2O is regulated by an A_3 mech-anism, i.e. random nucleation followed by subsequent growth. The kinetic parame-ters obtained are as follows: activation energy E=85.15 kJ·mol~(-1), frequency factor A=5.58×10~8 min~(-1), the compensation equation is log A=0.1119E-0.7832.

Key words: Calcium of oxalate, Thermogravimetry, Correlative judging method