A primary study on the water absorbing/releasing performance of molecular sieve desiccant

AbstractThe performance of water absorbing/releasing of 4A Molecular sieve desiccant was primarily investigated by weighting method. Three kinds of saturated salt solutions of Zinc Bromide, Potassium Acetate and Magnesium Chloride were employed in a constant temperature oven to simulate the different environment of humidity of test samples. The results show that the saturated water absorbing capability of Molecular sieve desiccant distinctly depends on the environmental condition of depositing. It increases linearly with the deposited time if the temperature keeps constant, and its slope changes with the humidity. The saturated water absorbing capability of Zeolte desiccant increase with the increasing environmental humuidity. The water absorbing rate of sacked Molecular sieve desiccant is only 1/6 of the essential value. After water absorbing capability is saturated, relative humidity equilibrium exists between the environment and Molecular sieve desiccant, and the humidity of Molecular sieve desiccant varies in the range of 6.1-31.9%. Under the condition of lower humidity of Silica Gel and Molecular sieve desiccant, the adsorbent water in the surface of Molecular sieve desiccant was released