Drying sorption enthalpy

Fig. 10.2-3 Ratio of the sorption enthalpy q to the enthalpy of vaporization A/ lg of potatoes dependent on the moisture content X of the drying good...

If the sorption isotherm is temperature-independent the heat of sorption is zero therefore a number of sorption isotherm equations used in agricultural sciences are useless from the point of view of dryer calculations unless drying is isothermal. It is noteworthy that in the model equations derived in this section the heat of sorption is neglected, but it can easily be added by introducing Equation 3.59 for the solid enthalpy in energy balances of the solid phase. 

Due to the amorphous structure, ANP acquires such specific features as increased content of functional groups, high accessibility, and sorption ability (loelovich, 2013a, 2014a). Freeze-dried amorphous nanocellulose has an enhanced wetting enthalpy (—125 to — 130J/g), absorbs up to 35—40% water vapor, and completely decomposes under action of cellulolytic enzymes. Moreover, the chemical modification of ANP is carried out faster and deeper than other kinds of nanocellulose. 

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