Recovery of selenium from urethane solutions

Details Recovery of selenium from urethane solutions Recovery of selenium from urethane solutions

1976-08-30

1977-08-09

Stern, Edward

Chemistry of inorganic compounds

Selenium or tellurium or compound thereof

423509, 423510, C01B 1900

Patent

active

040411397

ABSTRACT:
A process for the recovery of selenium by liquid-liquid extraction from a urethane solution containing selenium compounds by contacting the selenium-containing urethane solution at a suitable temperature with water and a saturated aliphatic or alicyclic paraffin hydrocarbon or mixtures thereof. The selenium may be recovered from the resulting hydrocarbon phase in the form of selenium per se or selenium dioxide for reuse in the preparation of urethanes.

REFERENCES:
patent: 1915703 (1933-06-01), Towne et al.
patent: 2406666 (1946-08-01), Clark et al.
patent: 3437453 (1969-04-01), Serpinet
patent: 3743481 (1973-07-01), Nakano
patent: 3848069 (1974-11-01), Carey et al.
patent: 3895054 (1975-07-01), Zajacek et al.

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