METHOD OF EXTRACTING TUNGSTEN HEXAFLUORIDE FROM MIXTURE OF TUNGSTEN HEXAFLUORIDE AND ANHYDROUS HYDROGEN FLUORIDE Russian patent published in 2013 - IPC B01D11/00 C01G41/04 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The method is based on extracting WF₆ from a (WF₆:HF) mixture with benzene (C₆H₆). The extraction process is carried out with ratio of benzene to the mixture of tungsten hexafluoride and hydrogen fluoride ranging from 7:1 to 2:1, at temperature of 300-303 K for 15 minutes with mechanical mixing. The mixture is then cooled to 278-283 K and the obtained solution is transferred to a dividing device. The purification process is carried out in liquid phase without using solid sorbents.

EFFECT: invention enables to separate an azeotropic mixture of tungsten hexafluoride and hydrogen fluoride.