Aluminum trichloride (anhydrous) sublimation purification and preparation method

Abstract

A preparation method for sublimation and purification of anhydrous aluminium trichloride relates to a physical and chemical purifying preparation method of the anhydrous aluminium trichloride of inorganic salt by heating and subliming; an aluminium container is used for the heating and subliming of the anhydrous aluminium trichloride. The method of the invention takes fully consideration of the performance of corrosion resistance of a living container made from metallic aluminium material to aluminium trichloride and the volume of subliming process instrument made can be comparatively large so as to improve productivity and the cost control of the process instrument is relatively good; in addition, due to good heat conductivity of the metallic aluminium material, the purpose of saving energy can be realized and the production cost and price of LiAlCl4 / SOCl2 can be obviously reduced; the production cost of lithium-thionyl chloride batteries with the same specification can be reduced by 50 percent at most.

Description

1. Technical field [0001] The invention relates to a method for physically and chemically purifying inorganic salt anhydrous aluminum trichloride through heating and sublimation, in particular to a method for preparing anhydrous aluminum trichloride by sublimation and purification. 2. Technical Background [0002] Aluminum trichloride AlCl 3 , English name Aluminum trichloride, molecular weight 133.35, relative density (water = 1) 2.44, vapor pressure 0.13kPa (100°C), melting point 190°C (253kPa), acid corrosion product hazard mark 20, is chemically processed from bauxite or An important inorganic salt obtained by chlorination of metal aluminum. Industrially, aluminum trichloride has solid anhydrous and hexahydrate and liquid aluminum trichloride products. The anhydrous substance is white solid or powder of hexagonal crystal system, and the industrial product is often light yellow, gray or orange due to impurities such as free chlorine, iron or trace organic matter. It ab...

AI Technical Summary

Problems solved by technology

[0009] At present, there are two main technologies for industrial production and purification of anhydrous aluminum trichloride. One is that after the gasification of steel equipment discharges impurities such as water and hydrogen sulfide, the aluminum trichloride crystallizes on the wall of the cooling tower and then scrapes it away from the crushed package. One is thermal sublimation collection and purification of glass instruments and equipment. Although the former has a large industrial production capacity, the disadvantage is that it cannot prevent the iron metal components from entering the product after being corroded by aluminum trichloride, which seriously affects the purity, resulting in the yellow color of the finished product, which is difficult. It is used to prepare lithium battery electrolyte; although the latter can guarantee the purity of the product, the disadvantage is that due to the limitation of the material of the glass container, the production capacity of a single device is very small. Generally, the feeding amount of each sublimation tube is 1-1.5Kg at a time, and the product after sublimation is 0.85- 1.2Kg, in addition, the glass instrument will burst during the production process

Due to the above reasons, LiAlCl 4 / SOCl 2 High material prices affect the large-scale production of lithium-thionyl chloride batteries