Solvent extraction behaviour of thiocyanic acid.
The solvent extraction behaviour of thiocyanic acid with isobutyl methyl ketone and xylene as solvents is described. In the ketone system the thiocyanic acid is solvated in the organic phase to give a complex with a proposed composition of HSCN. 2IBMK. Deviations from ideal behaviour, which can be attributed to variations in the activity coefficient of the acid in the aqueous phase, are shown.
Preparation of aqueous solutions of thiocyanic acid and their stability
ZusammenfassungVerschiedene Verfahren zur Herstellung von wäßrigen HNCS-Lösungen wurden untersucht. Hochreine Lösungen (≥ 99%) können durch Reaktion von äquimolaren Mengen Ba(NCS)2 und H2SO4 und anschließende Abtrennung des BaSO4 durch Zentrifugieren hergestellt werden. Bei 4° C sind 1–2 M Lösungen 10–20 Tage lang beständig.SummaryVarious procedures for the preparation of aqueous HNCS solutions have been investigated. Reaction of equimolar amounts of Ba(NCS)2 and H2SO4, and subsequent separation of BaSO4 by centrifugation, yields highly pure (≥ 99%) HNCS solutions. When kept at a temperature of 4° C, 1–2 M solutions are stable for a period of 10–20 days.
The influence of diluent polarity on extraction of plutonium complexes to organic media
Abstract The influence of the polarity of diluents on the extraction of plutonium (IV) complexes from nitric acid solution with tri-n-butylphosphate, di-n-butylphosphate, thenoyltrifluoroacetone, tetra-n-butylammoniumnitrate and methylisobutylketone has been examined. Diluents such as carbon tetrachloride, chloroform, benzene, cyclohexane, n-heptane, bromoform and dibromoethane have been used singly and in mixtures. Evidence is presented for the importance of the dipole moment of the diluent in the extraction process in connection both with the structure of the organic phase and dipole-dipole interaction promoting solvation of the Pu-complex. Maxima exist in the extraction of Pu-TBAN complexes to phases containing mixtures of polar diluents with non-polar diluents and in particular with benzene.