Method for preparing high-purity anhydrous indium trichloride

Abstract

The invention relates to a preparation method of high purity anhydrous indium trichloride, which belongs to the technology field of rare metal fine chemical industry. The preparation method includes: Using 99.99-99.999% Indium metal and 36% hydrochloric acid as the material and using organic solvents including n-butyl alcohol and n-heptane as the dehydrant, that is, using more unstable complex to replace more stable compound, the stable hydrated indium trichloride is replaced with the more unstable complex of the indium trichloride organic solvent; adopting a manner of microwave heating and gradually heating up including three steps of distillation dehydration at normal pressure, distillation de-reagent at reduced pressure and sublimation and purification of the anhydrous indium trichloride; and finally obtaining the high purity anhydrous indium trichloride (InCl3), which is white with a purity of up to 99.99-99.999% and a production rate of 97%-98%.

Description

1. Technical field: [0001] The invention relates to a method for preparing high-purity anhydrous indium trichloride, belonging to the technical field of rare metal fine chemicals. 2. Background technology [0002] High-purity anhydrous indium trichloride (InCl 3 ) is the main raw material for the preparation of ITO thin films and III-V semiconductor materials. It is one of the important solar cell materials and the basic raw material for the synthesis of organic indium series compounds. It can be used as a catalyst for organic reactions. In terms of organic synthesis and electronics industry Has a wide range of applications. my country is a country with large indium resources, and the annual smelting of indium metal can reach 400 tons, ranking first in the world. But InCl 3 The production of the current domestic production can only produce InCl 3 4H 2 O and InCl 3 , while high-purity anhydrous InCl 3 Must be imported and expensive. Although the preparation of anhydro...

AI Technical Summary

Problems solved by technology

These preparation methods have their own advantages and disadvantages. Some methods have higher requirements on the purity of raw material reagents, stricter temperature control, complex equipment, and lower output. Some methods are difficult to post-process and serious environmental pollution, etc.

Although foreign existing literature reports utilize organic solvents such as amine, formamide and kerosene to remove crystal water in crystalline chloride to prepare anhydrous chloride, but also because the processes involved in these reactions are often more complicated, the reaction time is long, The experimental conditions are demanding, the reagents are expensive, there are organic reagents that are polluted and dangerous, the equipment is large in size, high in energy consumption, difficult to operate, few in resources, and high in cost.