Desiccants primarily remove moisture through two mechanisms:
Chemical Reaction: For example, quicklime (calcium oxide, CaO) reacts with water to form calcium hydroxide, an irreversible and exothermic reaction.
Physical Adsorption: Desiccants, such as silica gel and montmorillonite, utilize their porous structures to adsorb water molecules; some are reusable.
Diverse Forms for Easy Packaging: Commonly available in small granular, powder, or block forms, packaged in non-woven fabric or breathable membranes, facilitating placement in various packaging spaces.
Wide Range of Applications: Different types of desiccants are suitable for different temperature and humidity conditions. For example, montmorillonite is suitable for environments below 50℃, while calcium chloride remains highly effective at absorbing moisture in high humidity environments.
Targeted Selection: Choose a suitable desiccant based on the properties of the substance being dried (acidity, alkalinity, sensitivity, etc.) to avoid adverse reactions. For example, alkaline desiccants cannot be used to dry acidic gases.