Polyaluminium chloride (PAC) is a chemical compound with the formula Al2(OH)nCl6-n, where n is the degree of hydrolysis. It is a widely used coagulant in water treatment, wastewater treatment, and industrial processes. Here are some key properties and uses of polyaluminium chloride:
Properties
1. Chemical Formula: Al2(OH)nCl6-n
2. Molecular Weight: Variable, depending on the degree of hydrolysis
3. Appearance: White or yellowish powder
4. Solubility: Soluble in water, slightly soluble in organic solvents
5. pH: 3.5-5.5 (1% aqueous solution)
Uses
1. Water Treatment: Polyaluminium chloride is used as a coagulant in water treatment to remove suspended solids, turbidity, and contaminants.
2. Wastewater Treatment: It is used to treat wastewater from various industries, including textile, paper, and food processing.
3. Industrial Processes: PAC is used in various industrial processes, such as:
1. Paper sizing and coating
2. Textile dyeing and finishing
3. Leather tanning and finishing
4. Oil and gas drilling
4. Swimming Pool Treatment: Polyaluminium chloride is used to clarify and disinfect swimming pool water.
Benefits
1. High Coagulation Efficiency: PAC has a high coagulation efficiency, making it effective in removing suspended solids and contaminants.
2. Low Dosage Requirements: It requires low dosage rates, making it a cost-effective coagulant.
3. Wide pH Range: PAC can be used over a wide pH range, making it suitable for various applications.
4. Non-Toxicity: It is generally considered non-toxic and safe for use in water treatment and industrial processes.
