Synthesis process of tantalum pentachloride

The synthesis process of tantalum pentachloride mainly includes the following steps:
1、 Raw material preparation
Prepare high-purity tantalum metal and high-purity chlorine or hydrogen chloride (HCl) as raw materials. The purity of tantalum metal has a significant impact on the purity of the final product.
2、 Chlorination reaction
Direct chlorination method: Tantalum metal is chopped or powdered, and then placed in a chlorine gas stream for chlorination reaction at a temperature range of 170-250. Chlorine gas reacts with tantalum to produce tantalum pentachloride. This reaction can also be carried out using HCl, but it needs to be carried out at a higher temperature (such as 400).
Indirect chlorination method: Tantalum pentachloride can also be obtained by reacting tantalum pentoxide with thionyl chloride (SOCl2) at 240 ° C. The reaction equation is: Ta2O5+5 SOCl2 → 2 TaCl5+5 SO2.
3、 Separation and purification
Cool the gas produced by the chlorination reaction to condense it into a liquid.
Separate and purify liquid tantalum pentachloride from impurities. Usually, distillation and other methods are used to separate different impurities based on their boiling point differences. This step is key to ensuring the purity of tantalum pentachloride.
4、 Drying treatment
Dry the separated and purified tantalum pentachloride to remove surface moisture and impurities. Drying treatment is crucial for maintaining the stability and purity of tantalum pentachloride.