Tungsten Hexafluoride Synthesis (3)

There are many synthetic methods tungsten hexafluoride. The following introduce chemical reactions which use tungsten, halogen and HF to react then to form tungsten hexafluoride. Tungsten hexafluoride formed by the react of tungsten, halogen and HF where the chemical reaction equation is as follows: W + 3X2 + 6HF - WF6 + 6HX. Wherein the X2 is a halogen, usually Cl2 or Br2, the reaction is carried out in an autoclave which make by monel alloy.
Using Cl2 as example, in order to ensure that the product has a good yield, generally make Cl2 and HF appropriate excess, in the theory chlorine and tungsten hexafluoride molar ratio of 3: 1, while in the experiment used 3~6: 1. Theory hydrogen fluoride and tungsten hexafluoride molar ratio of 6: 1, is used in the experiment used 6~10: 1, the reaction temperature is controlled at 150 ~ 450 ℃. While increasing the reaction temperature can make the reaction quickly but the temperature is too high will cause severe corrosion of equipment and WF6 partially decomposed.
By the way this method often has by-product, it is not a good way for produce tungsten hexafluoride not only by environmental protection or economic efficiency.

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