Process for producing a hafnium extraction scrub solvent

Details Process for producing a hafnium extraction scrub solvent Process for producing a hafnium extraction scrub solvent

1991-05-10

1992-07-28

Dawson, Robert A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210638, 210639, 210663, 210666, 423 70, B01D 1100

Patent

active

051338653

ABSTRACT:
A scrub solution is made up for use in starting up a hafnium liquid-liquid extraction system. An aqueous zirconium oxychloride-containing solution is contacted with methyl isobutyl ketone containing less than 1 Molar thiocyanic acid. The aqueous solution is maintained at a chloride concentration of 1.6 to 3.5 Normal (as HCl) by addition of concentrated hydrochloric acid. Ammonium thiocyanate is added to the acidified aqueous stream to produce thiocyanic acid. The high acidity of the aqueous solution drives the thiocyanic acid into the methyl isobutyl ketone without the chloride anions having a depressing affect on the transfer. The thiocyanic acid-containing MIBK may then be used as a scrubbing solvent to start up the hafnium extraction system.

REFERENCES:
patent: 2566665 (1951-09-01), Huffman et al.
patent: 2938769 (1952-07-01), Overholser et al.
patent: 3006719 (1961-10-01), Miller
patent: 3032388 (1957-10-01), McCord et al.
patent: 4873072 (1989-10-01), Abodishish

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