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[Chemical Knowledge]：Properties and Uses of Aluminum Ammonium Sulfate (Ammonium Alum)

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ammonium aluminum sulfate (ammonium alum) in the chemical production of raw materials in the field of properties and uses
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1. of the properties of ammonium aluminum sulfate ammonium aluminum sulfate

, also known as ammonium alum, is a colorless crystalline powder, with strong hygroscopicity. It is easily soluble in water and insoluble in ethanol. Aluminum ammonium sulfate is acidic, and its aqueous solution is acidic. In the air, ammonium aluminum sulfate can absorb moisture and carbon dioxide, generating basic ammonium aluminum carbonate.

ammonium aluminum sulfate has poor thermal stability, and it will decompose to produce ammonium sulfate and aluminum hydroxide when heated to 150 ℃. In addition, ammonium aluminum sulfate also has a strong reduction, can be oxidized to aluminum sulfate.

2. the use of ammonium aluminum sulfate

1. chemical raw materials: ammonium aluminum sulfate can be used as chemical raw materials for the manufacture of other chemicals. For example, it can be reacted with alkali to produce aluminum hydroxide, which in turn produces aluminum oxide, etc.
2. water purification agent: ammonium aluminum sulfate can be used as a water purification agent for water treatment. In water, aluminum ammonium sulfate can be hydrolyzed to generate aluminum hydroxide colloid, which can adsorb suspended solids and colloidal substances in water, so as to achieve the purpose of water purification.
3. preservatives: ammonium aluminum sulfate has a certain preservative effect, can be used as food preservatives. It can inhibit the growth of bacteria and extend the shelf life of food.
4. fabric treatment agent: ammonium aluminum sulfate can be used for fabric treatment, can improve the hardness and abrasion resistance of the fabric, can also be used as a fire retardant.

In conclusion, ammonium aluminum sulfate (ammonium alum) has a wide range of uses in the field of chemical production raw materials. Due to its unique properties and functions, it has important application value in many fields.

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