Tungsten Hexafluoride Synthesis (2)

Currently, there are there methods for synthesis tungsten hexafluoride which are common used. The first is by direct reaction of fluorine gas and tungsten to generate tungsten hexafluoride. The second is tungsten and nitrogen trifluoride (NF3) direct reaction to produce tungsten hexafluoride. The third method is to generate tungsten hexafluoride by react halogen, tungsten and HF. The following is introducing the reaction of using tungsten and nitrogen trifluoride to produce tungsten hexafluoride and in this reaction NF3 as fluorinating agent.
The reaction equations of tungsten and nitrogen trifluoride reaction is as follows: W + 2NF3 - WF6 + 3N2, the reaction conditions at temperatures greater than 400 ℃ decomposition of NF3 to produce F2. F2 reacts with the metal to generate tungsten hexafluoride. Besides the NF3 moisture content which used in reaction direct related to the purity of the product. That is need high-purity NF3 to produce tungsten hexafluoride. But the high-purity NF3 requires cryogenic condensation method to cool NF3 at -130℃~ -70℃, after water solidified to separate to make it. What’s more the reactor should make by nickel or monel. But this will lead to increased production costs, and a higher investment risk, which are not suitable for applied industrial production.

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