Poly Aluminum Chloride (PAC) is a highly effective inorganic polymer coagulant widely used in water treatment and other industrial applications. It is characterized by its complex polymeric structure, which contains multiple aluminum hydroxide groups. This polymeric nature allows PAC to exhibit superior coagulation and flocculation properties compared to traditional aluminum salts like aluminum sulfate (alum), making it a more efficient and often preferred choice for removing suspended solids, turbidity, and organic matter from water.

PAC functions by neutralizing the negative charge of suspended particles in water, causing them to destabilize and aggregate into larger, heavier flocs. These flocs can then be easily removed through sedimentation and filtration processes. Its high cationic charge density, combined with its polymeric structure, enables PAC to form larger, denser flocs more rapidly, leading to faster settling times and improved water clarity. PAC also generally performs well over a wider pH range than conventional coagulants, requiring less pH adjustment.

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The primary application of poly aluminum chloride is in municipal and industrial water and wastewater treatment. It is extensively used in drinking water purification plants to remove suspended solids, color, organic pollutants, and heavy metals, ensuring the production of safe and clean potable water. In industrial wastewater treatment, PAC helps in the removal of contaminants from various effluents, facilitating compliance with environmental regulations.

Beyond water treatment, PAC also finds applications in the paper and pulp industry as a sizing agent and retention aid, improving paper strength and drainage. It is also used in the cosmetic industry as an antiperspirant agent in deodorants. The production of PAC involves the controlled hydrolysis of aluminum chloride, often with the addition of a base, to form the polymeric aluminum species. Its efficiency, broad applicability, and relatively lower sludge generation compared to traditional coagulants solidify PAC's position as a critical chemical in environmental and industrial processes.