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Heat and Mass Transfer

, Volume 55, Issue 2, pp 571–579 | Cite as

Moisture sorption isotherms and isosteric heat of sorption of Tunisian clay product

  • Nouha JhiderEmail author
  • Mohamed Bagané
Technical Note

Abstract

The aim of this study was to determine the adsorption and desorption isotherms of Tunisian clay product at different temperatures with a water activity varying from 10.95 to 97% using the statistic gravimetric method, which is an important step to evaluate its hygroscopic character. It was found that when temperature increases, clay material becomes less hygroscopic due to physical and/or chemical changes in product. Ten mathematical models were used to fit experimental data of sorption isotherms. The fitting of the model to experimental data was evaluated with the correlation coefficient (R2) and the root mean square error (RMSE). The Oswin model was determined to be the best model for describing experimental data of adsorption and desorption in the investigated ranges of temperature and water activity. The net isosteric heat of sorption determined from sorption isotherms estimated from Oswin model and using Clausius-Clapeyron equation decreased continuously with increasing the equilibrium moisture content.

Keywords

Tunisian clay Sorption isotherms Gravimetric method Oswin model Net isosteric heat of sorption 

Nomenclature

A, B, C, K

Models constants for sorption isotherms

x0, y0

Models constants for isostoric heat of sorption

aw

Water activity

N

Numbers of experimental data

Xe

Equilibrium moisture content (kg water/kg d.b)

Xm

Monolayer moisture content (kg water/kg d.b)

R

universal gas constant (J/mol.K)

T

Temperature (K)

R2

Correlation coefficient

RMSE

Root mean square error

qn,st

Net isosteric heat (kJ/mol) subscripts

exp.

Experimental

pre

Predict

Abbreviation

BET

Brunauer-Emmett-Teller

d.b

Dry basis

GAB

Guggenheim-Anderson-de Boer

Notes

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Applied Thermodynamics Unit Research, National Engineering School of Gabès (ENIG)University of GabèsGabèsTunisia

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