What is a Hygroscopic Agent?

2022 11/25

Hygroscopic Agent refers to any substance that can absorb moisture from the air. It can be divided into three types: solid hygroscopic agent, liquid hygroscopic agent and gas hygroscopic agent according to the state of hygroscopic agent. Moisture absorbent. Also known as desiccant (Highly Hygroscopic Desiccant). The solid hygroscopic agent uses the adsorption principle to dehumidify the humid air; the liquid hygroscopic agent uses the absorption principle to dehumidify the air: the gaseous hygroscopic agent is the bed shrinking air, and this air is mixed with the moist air to realize the dilution of the moist air. purpose of dehumidification.

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Solid hygroscopic agent is a solid substance that can absorb water vapor from the air, also known as solid desiccant. It uses a porous substance with a large surface area to absorb moisture in the air under surface adsorption and capillary condensation. Since the partial pressure of water vapor on the surface of the solid hygroscopic agent is lower than the partial pressure of water vapor in the air, it absorbs the moisture in the air and achieves the purpose of air dehumidification.

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The most commonly used solid hygroscopic agents are silica gel and calcium chloride. On the psychrometric diagram, an air treatment process using a solid hygroscopic agent is an isenthalpic heating process. When the solid hygroscopic agent is in contact with the moist air, the solid hygroscopic agent absorbs the moisture in the moist air, and at the same time releases the latent heat of vaporization to heat the air, while the enthalpy value of the air before and after dehumidification remains unchanged.

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