Aluminum chlorohydrate
[CAS# 1327-41-9]

Identification

• Classification: Inorganic chemical industry >> Inorganic salt >> Metal halides and halides >> Metal chlorides and salts
• Name: Aluminum chlorohydrate
• Synonyms: Aluminum hydroxychloride
• Molecular Formula: Al2Cl(OH)₅
• Molecular Weight: 174.45
• CAS Registry Number: 1327-41-9 (101707-17-9 / 114442-10-3 / 84861-98-3)
• EC Number: 215-477-2
• SMILES: [OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Cl-]

Safety Data

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Substances or mixtures corrosive to metals	Met. Corr.	1	H290
Serious eye damage	Eye Dam.	1	H318
Eye irritation	Eye Irrit.	2	H319
Acute toxicity	Acute Tox.	4	H302
Skin irritation	Skin Irrit.	2	H315
Skin corrosion	Skin Corr.	1B	H314
Skin corrosion	Skin Corr.	1A	H314

Discovery and Applications

Aluminum Chlorohydrate (ACH) is an inorganic compound that was first synthesized in the early 20th century as a byproduct of an aluminum extraction process. The compound later gained recognition for its unique chemical properties and potential applications. ACH is a member of a family of aluminum-based compounds used in a variety of industrial and consumer products.

Aluminum Chlorohydrate is a white crystalline or amorphous powder that is soluble in water. It is a highly effective coagulant and flocculant due to its ability to neutralize negatively charged particles in solution. ACH is characterized by its acidic to neutral pH in aqueous solution, typically between 3.5 and 4.5. The compound is usually used in a hydrated form, which enhances its effectiveness in a variety of applications.

Water treatment is one of the major uses of aluminum chloride, and ACH is widely used as a coagulant in water purification processes. It aids in the aggregation of suspended particles and impurities to form larger flocs that can be easily removed by sedimentation or filtration. This process is essential for the production of clean and safe drinking water. In wastewater treatment, ACH helps remove suspended solids, organic matter, and pollutants. Its ability to form flocs increases the efficiency of the treatment process, resulting in cleaner wastewater.

In personal care and cosmetics, aluminum chloride is used for its antiperspirant properties. ACH is a key ingredient in many antiperspirants and deodorants. It works by temporarily blocking sweat ducts, reducing sweating and controlling body odor. This compound forms a gel-like plug in the sweat glands, blocking sweat from reaching the surface of the skin. ACH is also used in various cosmetic formulations because it has astringent properties that help tighten and condition the skin.

Aluminum chloride hydrate can be used in a variety of industrial processes. It is used as a sizing agent in the paper industry. ACH improves paper strength and printability by enhancing the bonding of fibers and fillers. This produces a higher quality paper product with better performance characteristics. In textiles, ACH is used as a mordant in dyeing processes. It helps to fix dyes to fibers, improving color fastness and overall fabric quality.

ACH has potential medical applications, especially in the field of vaccine adjuvants. Research has explored the use of aluminum chloride as a vaccine adjuvant. Adjuvants enhance the body's immune response to vaccines, making them more effective. ACH could help develop more effective, longer-lasting vaccines.

Due to its acidic nature, aluminum chloride should be handled with care, using appropriate safety gear, including gloves and goggles, and avoiding contact with skin and eyes. Proper ventilation is recommended to prevent inhalation of dust or fumes. Store ACH in well-sealed containers in a cool, dry place to prevent moisture absorption and degradation. Follow all safety guidelines for handling and disposal.

Aluminum chloride has a relatively low impact on the environment if managed properly. ACH is biodegradable and breaks down in the environment through natural processes. However, large amounts of aluminum chloride should be managed carefully to avoid potential impacts to aquatic systems. Proper waste management practices should be followed to minimize any potential environmental impacts.

References

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