Polyaluminum chloride (PAC) is a polymer flocculant, and its structural characteristics depend on the preparation method, reaction conditions, and different raw materials. Generally speaking, the structure of PAC can be summarized as a polymer mixture containing hydroxide ions (OH -) and chloride ions (Cl -).
The following are the structural characteristics of polyaluminum chloride in general:
Polymer structure: PAC is usually composed of polymers, which are covalently linked by aluminum and hydroxide ions. These polymers may contain different numbers of aluminum atoms, forming different degrees of polymerization.
Containing chloride ions: In PAC, chloride ions usually combine with aluminum atoms to form a partial structure of aluminum chloride. These chloride ions help regulate the charge properties of PAC and affect its flocculation effect in water treatment.
Highly variable structure: Due to the involvement of multiple reaction conditions and raw materials in the production process of PAC, PACs produced by different manufacturers may have different structural characteristics. This structural change will affect the performance and application of PAC.
Hydrolysis products: In water treatment, PAC undergoes hydrolysis reactions, releasing hydroxide ions and forming precipitates. This hydrolysis reaction is a key step in the PAC flocculation process.
Due to the complex structure of PAC, its specific structural characteristics may require in-depth research through advanced experimental techniques and analytical methods, such as nuclear magnetic resonance (NMR) and mass spectrometry analysis.