Different types of desiccant dehumidifiers perform in different ways, but the key approach they use to extract humidity with the air is possibly absorption or adsorption. Absorption happens in the event the desiccant compound dissolves as it will require dampness within the air, as is the situation with moisture absorbers. https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/