Long-Chain Amines. Versatile Acid Extractants

Liquid-Liquid Extraction With High-Molecular-Weight Amines

“…Simple Acids (2) Smith and Page ' first demonstrated the efficient extraction of mineral acids and organic acids from aqueous solutions with long-chain amines dissolved in organic diluents. They found that tertiary amines were more efficient than secondary or primary amines and showed that strong acids (19) could be extracted readily from mixtures with weak acids. Moore •^' extended the technique to other acids and particularly complex metal acids.…”

“…Polonium-210 tracer has been extracted essentially quantitatively (>995^) from 6 M hydrochloric acid solution with 5^ tri-n-benzylamine- (19) chloroform.^ ^' The extraction from 5 M hydrochloric acid -1 M nitric acid and from 6 M nitric acid was found to be 93^ and < 10^, respectively. …”

“…Solutions of 5^ methyl-di-n-octylamine in xylene or chloroform (52) have been shown^ ' to effect high extractions of protactinium tracer from 6 M hydrochloric acid solution. The extraction of protactinium-233 tracer from aqueous hydrochloric acid solutions with equal volume portions of 5^ (19) methyl-di-n-octylamlne-xylene^ •^' using five minute extraction periods is shown in Table VIII. The extraction behavior of protactinium tracer in the hydrochloric acidtrilsooctylamlne-xylene system has been found to be similar to that of (29) uranium(Vl).…”

“…The efficient extraction of uranium(VI) from dilute acetic acid solutions (19) (3) with methyl-di-n-octylamlne-xylene^ ^' and with tri-n-octylamlne-Amsco^"^' has been reported. ' an extraction coefficient of…”

Anion exchange separations of metal ions in thiocyanate media

“…The investigation of the extraction properties of amines did not begin until 1948 when Smith and Page (5) studied extraction of acids by solutions of high-molecular weight amines in organic diluents. Moore (6,7,8,9) and Coleman and co This comprehensive summary-includes some 467 references.…”