Removal of selenium from urethane solutions

Details Removal of selenium from urethane solutions Removal of selenium from urethane solutions

1976-09-29

1977-07-26

Stern, Edward

Chemistry of inorganic compounds

Selenium or tellurium or compound thereof

Elemental selenium or tellurium

423508, 423509, 4236585, C01B 1900

Patent

active

040383776

ABSTRACT:
A method for the removal and recovery of selenium by liquid-liquid extraction from a urethane containing selenium compound by contacting a hydrocarbon solvent solution of the selenium-containing urethane at a suitable temperature with an aqueous ammonium hydroxide or alkali metal hydroxide solution and recovering the selenium from the resulting selenium compound enriched aqueous hydroxide phase; the deselenized urethane remaining in hydrocarbon phase.

REFERENCES:
patent: 1915703 (1933-06-01), Towne et al.
patent: 2406666 (1946-08-01), Clark et al.
patent: 3268294 (1966-08-01), Roberts et al.
patent: 3437453 (1969-04-01), Serpinet
patent: 3577216 (1971-05-01), Weiss et al.

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