Physicochemical properties of polyaluminium chloride
Release time:
2022-01-10
Code name PAC. Usually also known as water purifier or coagulant, it is a water-soluble inorganic polymer between ALCL3 and AL(OH)3, the chemical formula is [Al2(OH)nCl6-n]m, where m represents the degree of polymerization,
Code name PAC. Usually also known as water purifier or coagulant, it is a water-soluble inorganic polymer between ALCL3 and AL(OH)3, the chemical formula is [Al2(OH)nCl6-n]m, where m represents the degree of polymerization, n represents the neutral degree of PAC products. The color is yellow or light yellow, dark brown, dark gray resinous solid. The product has strong bridging adsorption properties. During the hydrolysis process, physical and chemical processes such as condensation, adsorption and precipitation occur. The fundamental difference between polyaluminum chloride and traditional inorganic coagulants is that the traditional inorganic coagulants are low-molecular crystalline salt, while the structure of polyaluminum chloride is composed of multi-carboxyl complex with changeable morphology, fast flocculation and precipitation rate, wide PH range, non-corrosive to pipeline equipment, and obvious water purification effect. It can effectively remove SS, COD, BOD and heavy metal ions such as arsenic and mercury in water. The product is widely used in drinking water, industrial water and sewage treatment fields. (2) Hydrolyzed polyacrylonitrile ammonium salt NH4-HPAN is prepared by the hydrolysis of acrylic fiber under high temperature and pressure, and is a light yellow powder. It contains -- COOH, COONH4, CONH2, CN and other groups, and has a certain ability to resist mild and salt. It also has the function of light resistance and corrosion resistance, and has a certain anti-collapse effect due to the Mosaic effect of NH4+ in shale. This product is formed by polyacrylonitrile degradation at high temperature and high pressure, and its main components contain carboxylic acid, carboxyanyl, amide and ammonium nitrite, and its particles are not easy to caking. The product has strong effects on reducing fluid loss and high temperature and high pressure fluid loss, strong temperature resistance, good thermal stability, etc. It has a certain ability to inhibit clay hydration and anti-collapse, and has a good ability to resist salt and pollution.
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