Method for reducing content of ferric trichloride in anhydrous aluminum trichloride

Abstract

The invention discloses a method for reducing the content of ferric trichloride in anhydrous aluminum trichloride, wherein the method comprises the following steps: (a) aiming at the color of anhydrous aluminium chloride, the reactant amount and the reaction temperature are regulated; (b) a heater is connected with a heating medium pump, the heating medium pump is connected with a condenser, and an expansion tank is connected between the heater and the heating medium pump; (c) aluminum trichloride steam is cooled by using heat conducting oil, the aluminum trichloride steam is cooled and condensed into a solid, and ferric trichloride is removed; (d) the heat conducting oil is introduced into a waste heat recovery device and heat is collected; (e) the aluminum trichloride steam is naturally condensed and crystallized to obtain anhydrous aluminum trichloride; (f) the content of ferric trichloride in the anhydrous aluminum trichloride sample is calculated; and (g) the temperature of the heat conducting oil is regulated according to the calculated content of ferric trichloride in the anhydrous aluminum trichloride sample. The method significantly reduces the content of ferric trichloride in the anhydrous aluminum chloride, and has the effects of simple technological process, less equipment investment, low energy consumption, and high economic value.

Description

technical field [0001] The invention belongs to the technical field of anhydrous aluminum trichloride synthesis, and in particular relates to a method for reducing the content of ferric chloride in anhydrous aluminum trichloride. Background technique [0002] Aluminum trichloride, the industrial product is yellow granules or light yellow powder, with strong hydrochloric acid smell, easily soluble in water, alcohol, chloroform, carbon tetrachloride, slightly soluble in benzene. Aluminum trichloride can be hydrolyzed when it meets water vapor, and it will explode when it meets water. It is widely used in industry, the most important use is as a catalyst for Ferrett-Crafts reaction, it can also be used as an inorganic chemical product, an alkylating agent for the manufacture of detergents, synthetic drugs, synthetic dyes, and synthetic rubber , detergents, plastics, spices, etc. [0003] The industrialized production method of aluminum trichloride is that liquid chlorine is h...

AI Technical Summary

Problems solved by technology

[0004] The equipment used in the production process of anhydrous aluminum trichloride is conventional carbon steel equipment except for the reaction furnace. Because aluminum trichloride is prone to moisture and releases hydrogen chloride, the equipment has a certain degree of corrosion, which also leads to aluminum trichloride Industrial products contain a small amount of ferric chloride, generally in the range of 240-400PPM. The presence of ferric chloride will interfere with the catalytic effect of aluminum trichloride and affect the color of the product