Aluminum oxide is Al2 (OH) 5Cl · 2H2O, Aluminum Chlorohydrate (ACH), the Chinese name hydroxy aluminum chloride, also known as aluminum or aluminum chloride chloride, the formula Al2 (OH) 5Cl · 2H2O. Is a degree of alkalinity (base) higher than the polyaluminum chloride, second only to aluminum hydroxide inorganic polymer compounds, through the hydroxyl bridge polymerization, the molecules with the highest number of hydroxyl. White powdery solid, the solution is a colorless and transparent liquid. Aluminum oxide content of liquid products is above 23%, alumina content of solid products is 46% to 50%. There is a strong bridging adsorption, soluble in water, the hydrolysis process is accompanied by electrochemical, cohesion, adsorption and precipitation and other physical and chemical processes. -------------------------------------------------- ----------- And chlorine trichloride AlCl3 is white particles or powder, a strong hydrochloric acid smell, industrial products pale yellow. Soluble in water, alcohol, chloroform, carbon tetrachloride, slightly soluble in benzene. Melted aluminum chloride is less conductive and differs from most halide-containing salts (such as sodium chloride). Aluminum chloride solution completely dissociated, is a good conductor. Anhydrous aluminum chloride sublimates at 178 ° C and its vapor is an associative bimolecule. In the air to absorb moisture, part of the release of hydrogen chloride and hydrolysis. AlCl3 adopts the "YCl3" structure, which is the most densely populated Al-cubic layered structure, while the Al in AlBr3 accounts for the adjacent tetrahedral gaps in the Br-closest packing framework. Melting AlCl3 generated volatile dimer Al2Cl6, contains two three center four electronic chlorine bridge, higher temperature Al2Cl6 dimer is dissociated to generate planar triangle AlCl3, and BF3 structure similar.