Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Preparing inorganic compound
Patent
1997-02-19
1998-04-28
Phasge, Arun S.
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Preparing inorganic compound
C25B 100
Patent
active
057440220
ABSTRACT:
The present invention is directed to an apparatus and methods for preparing sulfur hexafluoride within an electrolytic cell by reacting elemental sulfur with fluorine electrolytically generated from substantially anhydrous hydrogen fluoride in the presence of a conductivity-enhancing solute. The reaction occurs at the anode of the electrolytic cell in a liquid electrolyte comprising substantially anhydrous hydrogen fluoride and an alkali fluoride wherein the concentration of hydrogen fluoride is maintained between about 64 and about 88 mole percent. The electrolytic cell is preferably divided into a cathodic half-cell and an anodic half-cell by a non-conductive diaphragm which permits passage of the electrolyte and current to provide communication between the half-cells while being impervious to fluid communication above the electrolyte to keep the generated gases separate. When so divided, substantially pure sulfur hexafluoride may be recovered from the space above the electrolyte in the anodic half-cell. The present apparatus and methods provide significant energy savings in the manufacture of sulfur hexafluoride.
REFERENCES:
patent: 2519983 (1950-08-01), Simons
patent: 2717235 (1955-09-01), Prober
patent: 3345277 (1967-10-01), Ashley et al.
patent: 3623964 (1971-11-01), Ukihashi et al.
patent: 4174266 (1979-11-01), Jeffery
"The Preparation of Sulfur Hexafluoride and Some of Its Physical Properties" The Journal of the American Chemical Society, vol. 52, pp. 4302-4308 (1930).
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