Desorption isotherms of flaxseeds (Linum usitatissimum L.) and thermodynamic parameters of the process

ABSTRACT Sorption isotherms of flaxseeds were determined by static gravimetric method at temperatures 40, 60, and 80 ºC, over a relative moisture range of 10-95%. Six mathematical models were applied to analyze the experimental data. The modified GAB model showed the best fitting to the experimental...

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Published inCiência agronômica Vol. 51; no. 2
Main Authors Valente, Maria da Conceição da Costa, Nascimento, Rafael Alves do, Santana, Elza Brandão, Faria, Lênio José Guerreiro de, Costa, Cristiane Maria Leal
Format Journal Article
LanguageEnglish
Portuguese
Published Universidade Federal do Ceará 01.01.2020
Subjects
AGRONOMY
Drying
Equilibrium moisture content
Isosteric heat
Secagem
Conteúdo de umidade de equilíbrio
Equilibrium moisture content
Drying
Isosteric heat
Calor isostérico
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Abstract ABSTRACT Sorption isotherms of flaxseeds were determined by static gravimetric method at temperatures 40, 60, and 80 ºC, over a relative moisture range of 10-95%. Six mathematical models were applied to analyze the experimental data. The modified GAB model showed the best fitting to the experimental data. The isosteric heat and differential entropy were determined by applying the Clausius-Clapeyron and Gibbs-Helmholtz equations, respectively. The isosteric heat and the entropy of desorption isotherm presented similar behavior, with a sharp change of 10% in the equilibrium moisture content. The enthalpy-entropy compensation theory was applied to the isotherms, indicating that they are enthalpy-controlled.
AbstractList ABSTRACT Sorption isotherms of flaxseeds were determined by static gravimetric method at temperatures 40, 60, and 80 ºC, over a relative moisture range of 10-95%. Six mathematical models were applied to analyze the experimental data. The modified GAB model showed the best fitting to the experimental data. The isosteric heat and differential entropy were determined by applying the Clausius-Clapeyron and Gibbs-Helmholtz equations, respectively. The isosteric heat and the entropy of desorption isotherm presented similar behavior, with a sharp change of 10% in the equilibrium moisture content. The enthalpy-entropy compensation theory was applied to the isotherms, indicating that they are enthalpy-controlled.
Author Valente, Maria da Conceição da Costa
Santana, Elza Brandão
Costa, Cristiane Maria Leal
Nascimento, Rafael Alves do
Faria, Lênio José Guerreiro de
AuthorAffiliation Universidade Federal do Pará
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  givenname: Maria da Conceição da Costa
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  givenname: Rafael Alves do
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  fullname: Nascimento, Rafael Alves do
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  fullname: Santana, Elza Brandão
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  givenname: Lênio José Guerreiro de
  surname: Faria
  fullname: Faria, Lênio José Guerreiro de
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  givenname: Cristiane Maria Leal
  surname: Costa
  fullname: Costa, Cristiane Maria Leal
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Issue 2
Keywords Secagem
Conteúdo de umidade de equilíbrio
Equilibrium moisture content
Drying
Isosteric heat
Calor isostérico
Language English
Portuguese
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Snippet ABSTRACT Sorption isotherms of flaxseeds were determined by static gravimetric method at temperatures 40, 60, and 80 ºC, over a relative moisture range of...
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SubjectTerms AGRONOMY
Drying
Equilibrium moisture content
Isosteric heat
Title Desorption isotherms of flaxseeds (Linum usitatissimum L.) and thermodynamic parameters of the process
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