Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Halogenous component
Patent
1990-10-12
1992-04-07
Niebling, John
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Halogenous component
55 69, 55 71, 423 77, 423341, C01B 3308, C01G 2504, C01G 2704, B01D 3900
Patent
active
051026376
ABSTRACT:
A vapor stream from a sand chlorinator containing principally zirconium tetrachloride, hafnium tetrachloride and silicon tetrachloride contaminated with ferric chloride is purified by cooling the vapor to a temperature of about 335.degree. C. to about 600.degree. C. The cooled vapors flow through a gaseous diffusion separative barrier where a silicon tetrachloride vapor stream contaminated with metal chlorides flows from the separative barrier as a "fast" stream; ferric chloride is adsorbed by the separative barrier; and a vapor stream principally containing zirconium tetrachloride, hafnium tetrachloride and silicon tetrachloride is screened by the separative barrier.
REFERENCES:
patent: 2914379 (1959-11-01), Forman
patent: 3388993 (1968-06-01), Peterson et al.
patent: 3653620 (1962-09-01), Greenberg et al.
patent: 4053558 (1977-10-01), Campbell
"Purification of SiCl.sub.4 by Adsorption Techniques", H. C. Theuerer, Journal of the Electrochemical Society, vol. 107, No. 1, pp. 29-32, (Jan. 1960).
Snyder Thomas S.
Stoltz Richard A.
Bolam Brian M.
Niebling John
Valentine J. C.
Westinghouse Electric Corp.
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