Does anyone know what is the "sosteric heat of sorption of rice husk, i am working on designing rice husk dryer and could not find any information and data about it.
Isosteric heat is obtained by applying the vant-Hoff-like equation to a concentration of a compound in an external phase or its vapor pressure in the gas, for a sorbed concentration maintaned constant. For that the sorption isotherms should be obtained, and the analysis is performed in a strict thermodynamic way, without using approximate models such as the Langmuir model. It is more or less straighforward for gas phase adsorption, needs several isotherms measured at different temperatures, and for any selected sorbed concentrations, ln (vapor phase pressure) is plotted vs 1/T et cetera. If performed carefully, the analysis of isosteric heats allows verifying whether the sorption heat/enthalpy depends on the loading, and in this way to check the basic assumptions of the approximated models. But it will need either proper way to interpolate the isostherms for a certain selected sorbed concentration, or to obtain the latters with the multiplicity of isotherm points, which is basically the same. The use of isosteric heats allows avoding typically non-addressed problems on whether Langmuir model maximal capacity changes with a temperature, and the affinity is really constant. Regarding risk husk, it is most probably water vapor sorption.
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