Dehydration of calcium hydrogen phosphate dihydrate
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 1,p. 34-37
- https://doi.org/10.1039/dt9730000034
Abstract
The dehydration of CaHPO4,2H2O has been studied isothermally between 409 and 537 K and over a range of partial pressures of water vapour between 1·3 cN m–2 and 6·0 kN m–2 at a total pressure of 1 atm. The rate of dehydration is controlled by diffusion of water, and below 478 K the activation energy is 190 kJ mol–1 and this value is not affected by the partial pressure of water vapour. However, above 478 K the activation energy drops markedly and is then affected by partial pressure of water vapour. Some evidence has been obtained for the formation of a monohydrate as an intermediate and, while this is not conclusive, this postulate helps to clarify the results of previous work.Keywords
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