Synthesis
Tungsten hexafluoride is commonly produced by the exothermic reaction of fluorine gas with tungsten powder at a temperature between 350 and 400 °C:
- W + 3 F2 → WF6
The gaseous product is condensed and separated by distillation from WOF4, a common impurity. In a variation on the direct fluorination, the metal is placed in a heated reactor, slightly pressurized to 1.2 to 2.0 psi (8.3 to 14 kPa), with a constant flow of WF6 infused with a small amount of fluorine gas.
The fluorine gas in the above method can be substituted by ClF, ClF3 or BrF3. An alternative procedure for producing tungsten fluoride is to react tungsten trioxide (WO3) with HF, BrF3 or SF4. Tungsten fluoride can also be obtained by conversion of tungsten hexachloride:
- WCl6 + 6 HF → WF6 + 6 HCl or
- WCl6 + 2 AsF3 → WF6 + 2 AsCl3 or
- WCl6 + 3 SbF5 → WF6 + 3 SbF3Cl2
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