Process for recovering or purifying selenium

Details Process for recovering or purifying selenium Process for recovering or purifying selenium

1985-08-12

1987-05-05

Doll, John

Chemistry of inorganic compounds

Selenium or tellurium or compound thereof

Elemental selenium or tellurium

423508, C01B 1902

Patent

active

046631410

ABSTRACT:
A process for recovering or purifying selenium is disclosed. A selenium-containing material is reacted with carbon monoxide and ammonia or a primary or secondary amine to form a compound soluble in an aprotic solvent. The reaction product is subjected to the reverse reaction by heating it to liberate selenium, which is separated by filtration. The reaction is specific to selenium, and selenium can be separated from sulfur, tellurium, arsenic, halogen, etc. The used reagents can be recovered and used repeatedly.

REFERENCES:
patent: 4374250 (1983-02-01), Hirashima et al.
Sonoda, N. et al., J. Am. Chem. Soc., 93, 6344 (1971).
Kiyoshi Kondo et al., "New Route for the Synthesis of Tetraalkylureas" Chem. Lett. (5) pp. 402-404 (1972).

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