Preparation method of zinc chloride

　　In ordinary inorganic chemistry, zinc chloride can be prepared by the reaction of hydrochloric acid and zinc particles: Zn + 2HCl = = ZnCl2 + H2 ↑, while the prepared zinc chloride usually contains water and the main hydrolysate: zinc oxychloride. Generally, it is purified by the following steps: 100g of zinc chloride is added to 800ml of dioxane, heated and fractionated. Filter while hot to remove zinc powder. After cooling, zinc chloride becomes white precipitation. Anhydrous zinc chloride can be sublimated by heating in hydrogen chloride gas stream, and then heated to 400 ° C in dry nitrogen gas stream. The sample can also be treated with dichlorosulfoxide. To prepare anhydrous zinc chloride, zinc chloride can be obtained by reacting hydrogen chloride gas with zinc, and zinc can also be obtained by burning zinc in chlorine.