Desiccant classification and application

Desiccant classification and application Desiccant is also called suction agent. It is used in moisture-proof and mildew-proof. It acts as a desiccant. It is a water-removing agent that absorbs moisture from the atmosphere. Its drying principle is to physically transfer water molecules. Adsorption in its own structure or by chemical absorption of water molecules and change its chemical structure into another substance. Divided into physical adsorption desiccant and chemical adsorption desiccant by adsorption method and reaction product.

Physically adsorbed desiccants are silica gel, alumina gel, molecular sieves, activated carbon, bone charcoal, charcoal, mineral desiccants, or activated clay, and its drying principle is to physically adsorb water molecules in its own structure.

The commonly used desiccants for chemical adsorption include lime-based desiccants, magnesium chloride, calcium chloride, soda lime, or phosphorus pentoxide, silicic acid, etc., which chemically absorb water molecules and change their chemical structures to become another substance.

Physical adsorption desiccant application:

1, desiccant for bottled drugs and food moisture. Ensure the dryness of the contents to prevent the growth of miscellaneous fungus.

2, desiccant can be made into a general package desiccant for moisture protection.

3, desiccant can be easily placed in various types of items (such as instruments and meters, electronic products, leather, shoes, clothing, food, medicines and household appliances, etc.) in order to prevent items from moisture mildew or rust.

Chemical adsorption desiccant application:

1. Acid desiccant: Concentration **, phosphorus pentoxide, used to dry acidic or neutral gas, concentrated sulfuric acid can not be used to dry hydrogen sulfide, hydrogen bromide, hydrogen iodide strong reducing acid gas.

2. Neutral desiccant: Anhydrous copper sulphate, calcium chloride, general gas can be dry, but calcium chloride can not dry ammonia.

3, alkaline desiccant: soda lime, quicklime, sodium hydroxide solids, used to dry neutral or alkaline gases.