Differing types of desiccant dehumidifiers do the job in different ways, but the primary process they use to extract moisture in the air is either absorption or adsorption. Absorption takes place if the desiccant material dissolves as it requires humidity through the air, as is the case with humidity absorbers. https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/