Differing types of desiccant dehumidifiers do the job in various ways, but the main procedure they use to extract moisture from the air is possibly absorption or adsorption. Absorption takes place when the desiccant substance dissolves as it takes moisture within the air, as is the case with humidity absorbers. https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/