Tungsten Hexafluoride Synthesis (1)

Tungsten hexafluoride is a strong fluorinating agent, with the exception of nickel, monel and stainless steel, make many metal fluoride at room temperature. In the dry state it has low corrode for glass, but able to respond quickly in heavy moisture. Tungsten hexafluoride and ionic halide react can form complex compound at a high temperature to reduce tungsten by hydrogen.
There are three methods for synthesis of tungsten hexafluoride, is described below using fluorine gas as the fluorinating agent in the process to produce tungsten hexafluoride: making tungsten and fluorine gas (F2) direct reaction to synthesis tungsten hexafluoride, in order to prevent the erosion container wall of fluorine, the reaction vessel material should be monel, nickel or stainless steel. Chemical reaction equation is as follows: W + 3F2 - WF6.
This reaction is carried out under the conditions of 400 ℃, tungsten direct reacts with F2 to  produce tungsten hexafluoride, because the nature of F2 is too lively, in order to make the reaction proceed smoothly requires a certain proportion of nitrogen added. Generally the tungsten metal is added by tungsten powder to make the gas-solid phase contact area as large as possible, and then collect tungsten hexafluoride into another low temperature container by liquid form.

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