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Revista Brasileira de Engenharia Agrícola e Ambiental

versão impressa ISSN 1415-4366versão On-line ISSN 1807-1929

Resumo

SILVA, Hellismar W. da; OLIVEIRA, Daniel E. C. de; RESENDE, Osvaldo  e  COSTA, Lílian M.. Thermodynamic properties of water desorption in Buchenavia capitata (Vahl) Eichler. Rev. bras. eng. agríc. ambient. [online]. 2018, vol.22, n.12, pp.878-883. ISSN 1807-1929.  http://dx.doi.org/10.1590/1807-1929/agriambi.v22n12p878-883.

Thermodynamic properties provide information on energy demand and kinetic parameters in water sorption processes in agricultural products. Such information is essential to analyze and scale drying and storage equipment. The objective of this study was to determine the thermodynamic properties involved in the water desorption process in Buchenavia capitata (Vahl) Eichler seeds with moisture contents ranging from 13.31 to 7.21% dry basis (d.b.), obtained by the indirect static method, at temperatures of 10, 20, 30 and 40 °C. The latent heat of vaporization, differential entropy and Gibbs free energy increase with the reduction of the moisture content of the seeds. The enthalpy-entropy compensation theory is valid for the desorption process, which is controlled by the enthalpy. The desorption of water in the seeds is not a spontaneous process.

Palavras-chave : latent heat; Gibbs free energy; theory of enthalpy-entropy.

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