Dehydration of Crystallization Water in Salts Using a New Designed Controlled-Water Vapor Micro DTA

  • M. Taniguchi
  • H. Moriguchi
  • S. Shimizu


The effects of water vapor pressure on the equilibria and kinetics for the dehydration of crystallization water in salts have been studied using a new designed controlled-water vapor micro sample DTA instrument. The dehydrations of CuSO4·H2O, CaC2O·H2O, ZnC2O4 · 2H2O and CaSO4 · 1/2H2O have been examined respectively. The partial pressures of H20(g) in N2 carrier gas flowing through the DTA chamber were kept constant within ±0.001atm over the wide pressure range from 0.01atm to 0.7atm. A dumbbel type Pt detector and Pt pan were used. For the comparison of data, the usual Ni block cell was also used. The van’t Hoff plots by using the initiation temperatures of DTA peaks and the fixed pH2O values gave the reasonable enthalpy changes for the dehydration reactions. The activation energies were obtained by introducing the correction term (1-P/Pe) in the kinetic equation.


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  1. (1).
    R.L. Stone and H.F. Rase, Anal. Chem. 29 (1957) 1273.CrossRefGoogle Scholar
  2. (2).
    R.L. Stone, Anal. Chem. 32 (1960) 1582.CrossRefGoogle Scholar
  3. (3).
    M. Taniguchi and T.R. Ingraham, Can. J. Chem. 42 (1969) 2467.CrossRefGoogle Scholar
  4. (4).
    P.D. Garn, Thermoanalytical Methods of Investigation, Academic Press (1965) p.224.Google Scholar
  5. (5).
    R.C. Mackengie (ed.), Differential Thermal Analysis vol.1, Academic Press (1970) p. 63, 101, 395.Google Scholar
  6. (6).
    W.W. Wendlandt, Thermal Methods of Analysis (2nd ed.), John Wiley & Sons (1974) p.202.Google Scholar
  7. (7).
    M. Taniguchi, Kagaku to Kogyo (The Chem. Soc. of Japan) 18 (1965) 645.Google Scholar
  8. (8).
    M. Taniguchi and Y. Yamamoto, Proc. of the 5th ICTA, (1977) 497.Google Scholar
  9. (9).
    S. Shimizu and M. Taniguchi, Nippon Kagaku Kaishi (The Chem. Soc. of Japan), 1977 (7) 957.Google Scholar
  10. (10).
    M. Wakihara, T. Uchida and M. Taniguchi, Metal Trans. 8 9B (1978) 29.Google Scholar
  11. (11).
    A. Yamamoto, K. Yamada, M. Maruta and J. Akiyama, Proc. of the 2nd ICTA, Vol.1 (1969) 105.Google Scholar

Copyright information

© Springer Basel AG 1980

Authors and Affiliations

  • M. Taniguchi
    • 1
  • H. Moriguchi
    • 1
  • S. Shimizu
    • 1
  1. 1.Department of Chemical Engineering, Faculty of EngineeringTokyo Institute of TechnologyTokyo 152Japan

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