Water Adsorption on AQSOA-FAM-Z02 Beads

Abstract

Water/AQSOA-FAM-Z02 adsorption equilibrium data have been measured using two gravimetric systems at 30 °C, 50 °C, and 70 °C in the range 1–90% relative humidity (RH). The data were found to conform to a type IV adsorption isotherm and have been correlated with the Rigid Adsorbent Lattice Fluid dual site model in the range 1–50% RH, which has been shown to reproduce the experimental results with an average absolute deviation in line with uncertainties measured from duplicate and replicate experiments. The adsorption and desorption data were found not to overlap even at 1% RH, resulting in an open hysteresis under the experimental conditions studied. The Rigid Adsorbent Lattice Fluid dual site model adapted to take into account a nondesorbing fraction of pores reproduced the experimental desorption curves providing an overall description of the system for use in adsorption process simulations. The isosteric heats of adsorption obtained show a complex concentration dependence with a local maximum (84.2 kJ mol–1) and minimum (55.8 kJ mol–1) which are values consistent with the ranges found in the literature.