Device and method for preparing anhydrous gallium chloride

Abstract

The invention provides a device for preparing anhydrous gallium chloride. The device comprises a reaction tube, a heating jacket, a temperature control device, a vacuum device, a collecting device anda tail gas treatment device, wherein gallium metal is arranged at the bottom of the reaction tube; a gas inlet tube is connected with a pressure meter and the vacuum device; a gas outlet tube of thereaction tube is wrapped with a thermal insulation sleeve and connected with the collecting device and the tail gas treatment device. Chlorine gas is dried by a drying device, then the dried chlorinegas is introduced into the reaction tube to be subjected to a reaction with the gallium metal, the reacted gas enters the collecting device and is subjected to cooling crystallization and collection,and tail gas is treated and discharged. The device has the advantages that the process is reasonable, collection is easy, introduction of impurities is easy to control, no pollution is produced, product purity is high, and the like.

Description

technical field [0001] The invention belongs to the field of compound synthesis equipment, in particular to a device for preparing anhydrous gallium chloride. Background technique [0002] Anhydrous gallium trichloride, molecular formula: GaCl 3 , white needle crystal, density 2.47g / cm3 (25 ℃). The melting point is 78°C and the boiling point is 201.3°C. It is easy to deliquesce in the air, easy to oxidize, and easy to dissolve in water. The preparation of anhydrous gallium trichloride needs to be carried out under an extremely dry, air-isolated and inert protective gas condition. [0003] A common method for preparing anhydrous gallium trichloride: pass dry hydrogen chloride gas or chlorine gas into a quartz tube filled with metal gallium, and when the air in the tube is exhausted, slowly raise the temperature to 200°C to make it react. After the reaction is completed, start to cool and pass through an inert gas to discharge hydrogen chloride gas. The sublimated product...

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Problems solved by technology

[0004] The disadvantages of the prior art are that hydrogen chloride gas or chlorine gas reacts with the surface of metal gallium, the reaction speed is slow, the efficiency is low, the gas utilization rate is low, and the exhaust gas has certain toxicity; the gaseous gallium trichloride is easy to cool and crystallize during the collection process clogged collection pipe

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