Distillation: processes – separatory – Adding material to distilland except water or steam per se – At least two materials
Patent
1988-09-12
1989-10-17
Bascomb, Wilbur
Distillation: processes, separatory
Adding material to distilland except water or steam per se
At least two materials
203 98, 203DIG16, 203DIG25, 75 845, 204 64T, 204130, 423 73, 423492, B01D 340, C01G 2504, C01G 2704, C22B 3414
Patent
active
048744751
ABSTRACT:
Improvements are described to a process in which the extractive distillation separation of zirconium or hafnium may be accomplished using mixtures of fused alkali metal or alkali metal and alkaline earth chlorides as the solvent. The solvent composition is adjusted to provide a low-melting eutectic, permitting recirculation of the stripped solvent in the liquid phase, as well as reducing the temperature required for thermal stripping (reducing the corrosivity of the fluid). Stripping of the bottoms is accomplished at least partially by direct electrolysis of the bottoms stream, producing the zirconium-free salt recycle stream to be transferred to the top of the column, and at least partially eliminating the need for chemical reduction of the tetrachlorides to metal (a costly process generating undersirable waste streams). Regeneration of the reflux is accomplished in a presurized condenser system, of one or more stages, with all material transport to be done in either the liquid or vapor states.
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McLaughlin David F.
Stoltz Richard A.
Bascomb Wilbur
Stoltz R. A.
Westinghouse Electric Corp.
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