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Physico-chemical, thermal, thermodynamic and kinetic characterization of a porous material (Di-calcium phosphate)

Abstract : The sorption isotherms of di-calcium phosphate (DCP) were determined using the gravimetric method at four temperatures. The sorption curves were fitted by the Guggenheim-Anderson-deBoer (GAB) model. The dehydration process was studied by means of X-ray diffraction. Thermo-gravimetric /differential thermal analyses (TGA / DTA) were used to record the loss of water and the nature of the products was studied by Fourier Transform Infrared Spectroscopy. The morphology of DCP was tested using the electronic scanning morphology (SEM). The thermal conductivity was determined using Hot Disk method. DCP convective drying kinetics modeling was conducted by the experimental study of the aero-thermal condition effects. The drying characteristic curves were then modeled using the nonlinear regression functions of MATLABR2013a. The curves predicted by the GAB model coincide well with the majority of the experimental points of the sorption isotherms. The net isosteric heat is mathematically expressed by second-order exponential function of the water content. SEM shows the presence of anhydrate and di-hydrate forms of DCP. DCP loses molecules of water when heated in two stages. Hot Disk method shows that the thermal conductivity depends heavily on the drying temperature and the product moisture. Midilli-kucuk is considered the most suitable model for the experimental results.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03617921
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Soumis le : mercredi 23 mars 2022 - 18:25:07
Dernière modification le : vendredi 5 août 2022 - 11:25:00

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Sana Jmai, Mohamed Bagane, Michèle Queneudec-T’kint. Physico-chemical, thermal, thermodynamic and kinetic characterization of a porous material (Di-calcium phosphate). Heat and Mass Transfer, Springer Verlag, 2019, 55 (12), pp.3589-3602. ⟨10.1007/s00231-019-02625-x⟩. ⟨hal-03617921⟩

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