Process for fine purification of sulphur hexafluoride from impur

Details Process for fine purification of sulphur hexafluoride from impur Process for fine purification of sulphur hexafluoride from impur

1981-07-01

1983-04-19

Hearn, Brian E.

Chemistry of inorganic compounds

Halogen or compound thereof

Sulfur containing

62 12, 62 18, 23294R, 23295R, C01B 1745

Patent

active

043805329

ABSTRACT:
The present invention relates to the production of high-purity substances and, more specifically, to a process for a fine purification of sulphur hexafluoride from impurities.
The process for a fine purification of sulphur hexafluoride comprises purification of sulphur hexafluoride by crystallization at a speed of displacement of the interphase boundary of from 1 to 50 mm/hr at a temperature of from 222.3 to 217.degree. K.; the liquid-phase concentrate formed during crystallization is subjected to sublimation purification under a pressure of from 210 to 1.3-0.13 KPa.
The high-purity sulphur hexafluoride is useful in the high-voltage energetics as an insulation and arc-exctinguishing medium, as well as in electronics, laser engineering, metallurgy and medicine.

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Pfann, Zone Melting, John Wiley & Sons, NY, (1958), pp. 1-4, 20-27, 109-111.
Lykhmus, "The Cryogenic Growth of Crystals for Spectroscopic Studies", Sov. Phys. Crystallog., vol. 20, No. 5, (1976), pp. 668-670.

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