Separation of Protactinium and Niobium by Liquid-Liquid Extraction

Abstract

meas-ured on the pure components.Evidently, the acidic nature of one of the two absorbents is enhanced by the presence of the other. The nature of the interaction which brings about increased acidity has not been determined. Use can be made of this characteristic, however, to separate aliphatic amines, certain TV-substituted and ring substituted aromatic amines. The following general method is offered for the separation: Sample size and column length will have to be adjusted to the relative concentrations of the individual constituents.The sample is first dissolved in benzene and applied to a silicic acid column employing benzene as developer. Ar-Alkyl-substituted aromatic amines and certain ring-substituted aromatic amines pass into the filtrate while the aliphatic amines are held firmly near the top of the column. The filtrate is then concentrated by evaporation and introduced into a column of 50% by weight of boron oxide-silicic acid where the Ar-alkyl substituted aromatic amines remain at the top of the column and the ring substituted aromatic amines pass into the filtrate. The amines to which this method has been applied are:A*-alkyl-substituted aromatic amines-methylaniline, ethylaniline, dimethylaniline, and diethvlaniline.Ring-substituted aromatic amines-o-and p-nitroaniline, oand p-chloroaniline, and o-and p-methylaniline.Aliphatic amines-butylamine, amylamine, and decylamine.Those mixed adsorbents which share the adsorption of organic molecules, thus exhibiting R/ values intermediate between those measured on the pure adsorbents, should afford the practical chromatographer a wider choice of adsorbents.ACKNOW LEDGMENTThe authors wish to express their appreciation to the Phillips Petroleum Co., Bartlesville, Okla., for the generous financial grant under which this work was possible.

Interfacial Activity of Trioctyloamine in Hydrocarbon/Water Systems with Nonorganic Electrolytes

“…[3] In the case of adsorption in ionic systems the Gibbs equation can be applied in the form proposed by Haydon et al (22)…”

“…Toluene and octane, distilled before the measurement, were used as the organic diluents. The extractant was dissolved in the organic phase and the concentration of TOA was changed from 10 −6 to 10 −1 mol/dm 3 .…”

Chemical Properties of Element 105 in Aqueous Solution: Extractions into Diisobutylcarbinol

“…Methods described in the literature [10,11] give excellent separations, but are not suitable for our purposes, because solutions containing 6 M H2SO4 are employed, leading to problems in the fast preparation of weightless samples for aspectroscopy by evaporation. From the results shown in Fig.…”

Solvent Extraction Study of233Pa(V) with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone

“…1,2) The extraction pattern of Pa is relevant with respect to the chemistry of dubnium (Db), as Db resembles its pseudo homologue protactinium rather than its closest homologue tantalum (Ta). Kratz et al, 3) Paulus et al 4) and Zimmermann et al 5) studied the extraction behavior of 233 Pa and its other homologues with triisooctyl amine (TIOA), tri-n-octyl amine (TOA) and aliquat 336, a quaternary ammonium salt.…”