IUPAC Name
-
Cas Number
1327-41-9
HS Code
2827.32.00
Formula
[Al2(OH)nCl6-n]m
Industry
Water Treatment Chemicals
Appearance
White or Slightly Yellowish Powder
Common Names
Aluminum Chlorohydrate, Polyaluminium Hydroxychlor
Packaging
25 kg PP woven bag
Polyaluminium Chloride (PAC) is an inorganic polymer coagulant, commonly used in water treatment as a yellow solid powder. It outperforms other aluminum salts such as aluminum chloride, aluminum sulfate, and various forms of Polyaluminium chlorisulfate and Polyaluminium chloride due to their lower charge compared to PAC.
Two methods are used for producing Polyaluminium Chloride (PAC) - the Gypsum process and the Pressure process, with the latter being extensively employed in Europe and Latin America. The steps involved in the Pressure process are outlined below: 1. Mixing the press cake with Hydrochloric acid. This stage requires press cake as a raw material containing aluminum metal, alumina chloride, alumina trihydrate, and aluminum sulfate. The press cake is combined with concentrated hydrochloric acid in an agitated tank. The press cake consists of approximately 9% (w/w) aluminum and 12% (w/w) sulfate. It dissolves in the hydrochloric acid solution. The reactor's temperature reaches approximately 150°C, and the pressure is high. 2. Combining the resulting product with aluminum hydroxide. In the initial phase, hydrogen is released as a byproduct, which is an explosive and hazardous substance. Typically, the industry introduces aluminum hydroxide in the subsequent step. The amalgamation of aluminum hydroxide and hydrochloric acid yields aluminum chlorohydrate (ACH). This reaction establishes the values of 'm' and 'n' in the Polyaluminium chloride molecules. The reaction occurs at 500 kPa and 170°C. 3. Precipitating the solution. The pressure and temperature of Polyaluminium chloride are reduced to standard levels. To achieve stable PAC, a minimum of 9 weeks at 30°C is required for precipitation. Any water present during the process evaporates in the reactor, producing steam. Ultimately, Polyaluminium chloride contains more than 50% Al2O3.
Polyaluminium Chloride (PAC) is an inorganic polymer coagulant, commonly used in water treatment as a yellow solid powder. It outperforms other aluminum salts such as aluminum chloride, aluminum sulfate, and various forms of Polyaluminium chlorisulfate and Polyaluminium chloride due to their lower charge compared to PAC.
Two methods are used for producing Polyaluminium Chloride (PAC) - the Gypsum process and the Pressure process, with the latter being extensively employed in Europe and Latin America. The steps involved in the Pressure process are outlined below: 1. Mixing the press cake with Hydrochloric acid. This stage requires press cake as a raw material containing aluminum metal, alumina chloride, alumina trihydrate, and aluminum sulfate. The press cake is combined with concentrated hydrochloric acid in an agitated tank. The press cake consists of approximately 9% (w/w) aluminum and 12% (w/w) sulfate. It dissolves in the hydrochloric acid solution. The reactor's temperature reaches approximately 150°C, and the pressure is high. 2. Combining the resulting product with aluminum hydroxide. In the initial phase, hydrogen is released as a byproduct, which is an explosive and hazardous substance. Typically, the industry introduces aluminum hydroxide in the subsequent step. The amalgamation of aluminum hydroxide and hydrochloric acid yields aluminum chlorohydrate (ACH). This reaction establishes the values of 'm' and 'n' in the Polyaluminium chloride molecules. The reaction occurs at 500 kPa and 170°C. 3. Precipitating the solution. The pressure and temperature of Polyaluminium chloride are reduced to standard levels. To achieve stable PAC, a minimum of 9 weeks at 30°C is required for precipitation. Any water present during the process evaporates in the reactor, producing steam. Ultimately, Polyaluminium chloride contains more than 50% Al2O3.
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