The production of Poly Aluminum Chloride (PAC) generally does not require high pressure. However, it does involve a reaction that can occur at elevated temperatures.

The typical process for producing PAC involves the reaction between aluminum hydroxide or aluminum chloride and sodium hydroxide or another strong base under controlled conditions. The process can be summarized as follows:

1. Aluminum Source : Aluminum metal, alumina, or aluminum chloride is used as the source of aluminum ions.

2.  Chlorination : Aluminum hydroxide reacts with hydrochloric acid to form aluminum chloride.

3.  Polymerization : Aluminum chloride then undergoes a controlled hydrolysis reaction in the presence of water, often with heat to speed up the reaction kinetics. This results in the formation of polymeric aluminum species with varying degrees of polymerization. The temperature during this stage typically ranges from 40 to 90°C (104 to 194°F), which is considered moderate rather than high-temperature processing.

4.  Adjustment : The pH and the degree of polymerization are adjusted by adding a controlled amount of an alkaline substance like caustic soda (sodium hydroxide) to obtain the desired properties of the final PAC product.

Overall, while the process may include heating steps, it does not typically require high-pressure conditions. The key parameters are more focused on chemical ratios, reaction time, and temperature control to produce PAC with the appropriate coagulation efficiency and solubility for its intended water treatment application.

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