摘要:

With the aim of improving our knowledge about the extraction of indium from perchlorate media, by 1-phenyl-3-methyl-4-acyl-pyrazol-5-ols, "HL" (HPMBP: acyl = benzoyl, HPMTP: acyl= thenoyl) and their mixtures with tri-n-octylphosphine oxide, "T0P0", in toluene, synthetic and extraction organic phases, and extractable complexes, have been studied by phosphorus-31 and proton

ISSN:0736-6299    

DOI:10.1080/07366299108918069

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The extraction of divalent copper, nickel and cobalt from acidic chloride solutions with solutions of heptaloxime, nonaloxime and 2-methyldekaloxime in toluene has been studied at 18*C.

ISSN:0736-6299    

DOI:10.1080/07366299108918070

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Equilibrium data for the solvent extraction of nickel from amraoniacal solutions by LIX 64N (10 vol%) dissolved in kerosene (15% aromatic content) are reported. The effect of NH3/aq) concentration, LIX 64N concentration, pH and temperature are shown. The stoichiometry of the Ni-active oxime in LIX 64N complex was ascertained by spectrophotometry studies. A mathematical mechanistic model was developed for the prediction of extraction distribution coefficients as a function of pH. The model predicts more accurate results at high pH values, as could be expected taking into consideration the assumptions made in developing the model.

ISSN:0736-6299    

DOI:10.1080/07366299108918071

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The solvent extraction of lanthanides with N-o-methoxy-(o-MBPHA), N-m-methoxy- (m-MBPHA) and N-p-methoxybenzoyl-N-phenylhydroxylamine (p-MBPHA), respectively, in chloroform was studied. The selected lanthanides (Yb, Ho, Eu, Pr and La) were all found extract with m- and p-MBPHA as self-adducts of the form LnL-2HL, where L and HL denote the ligand anion and neutral ligand, respectively. The extraction constant and separation factors for the lanthanides with m- and p-MBPHA were evaluated.

ISSN:0736-6299    

DOI:10.1080/07366299108918072

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The thermodynamics of extraction of some lanthanide ions and bismuth, aluminium, calcium and zinc ions from perchloric acid into solutions of 2-ethylhexylhydrogen-p-phenylphosphonate have been studied. The extractions have been compared with those that employ dinonylnaphthalenesulphonic acid and factors that are responsible for the greater selectivity of the phosphonate have been elucidated. Charge density of the cation has a major influence on the mechanism of the reaction and in turn upon the thermodynamic parameters.

ISSN:0736-6299    

DOI:10.1080/07366299108918073

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The separation of Sc and Y from the lanthanides by extraction with various quaternary ammonium salts was investigated. Aliquat-336,methyltrioctylammonium nitrate (MTOA), methyldibutylhexadecylammonium nitrate (MDBHDA) and tributylhexadecylammonium nitrate (TBHDA) were used as extractants. The synthesis of MDBHDA and TBHDA from industrial products is described. From the results obtained in the extraction studies of REE as a function of the parameters of aqueous and organic phases, we have determined the optimal separation conditions. The salting-out action in these systems of a great number of cations such as Al3+, Fe3+, Mg3+, Cu3+, Ni3+, Li3+, Cs3+, was investigated. To determine the functional dependences of the separation factors for the REE, the viscosity of the water layer around the ion was used.

ISSN:0736-6299    

DOI:10.1080/07366299108918074

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Luminescence lifetimes have been measured for Eu(III) extracted into benzene solutions. The extrac-tants were HDEHP, HTTA, and mixtures of HTTA with crown ethers, TBP, and TOPO. The results were consistent with no residual hydration for Eu(DEHP)3, and three molecules of hydration for Eu(TTA)3,. The Eu(TTA)3,-(TOPO)„n(n = 1,2) complexes have one water molecule or less. The hydration numbers from the luminescence lifetimes compare well with the values from Karl Fischer titrations. The hydration of the crown ether complexes can be related to the degree of steric hindrance by the aliphatic or aromatic groups attached to the crown ethers.

ISSN:0736-6299    

DOI:10.1080/07366299108918075

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The method of IR spectroscopy was used to study extracts of p-ni troplienol (NP) with neat butyl acetate (BA). It was found that hydrated H-complexes NP'H2O't (BA)2were preferably formed. In those complexes, the molecule of NP is H-bonded with the oxygen in H20, while both protons of H20 are H-bonded with the BA molecules. With growing C, polymers (NP H2O BA) 'BA containing bridged molecules of BA are formed. The C=0-groups in BA are H-bonded with two water molecules. The NP extracts with 1.5 M BA solutions in CCl24contain mostly H-coraplexes as NP'BA associated with another BA molecule by outer-spheric interactions. Also, hydrates NP’(H20) BA with 1=1,2 are found at high NP concentration, whereas NP'H20’(BA)2is formed at low NP concentration. Our discussion is concerned with the existing interconnection between the structure and composition of associftes formed in the extracts and the strengths of H-bond in these associates, judged by the values of low-frequency shifts υOH) of H20 and NP and υC=0) of BA in their IR spectra.

ISSN:0736-6299    

DOI:10.1080/07366299108918076

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

The adsorption of silver and copper cyanides by various functional polymers ( conventional anionites,exchangers with modified amino alkyl group and S-or S,N-modified polystyrene) has been investigated.The maximum silver and copper adsorption as well as the Cu/Ag ratio on the resin have been determined.In addition,IR measurements have been carried out to determine the kind of bonding of the metal cyanides.

ISSN:0736-6299    

DOI:10.1080/07366299108918077

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

NMR spectral evidence that Gd(III) bonds to the phosphoryl and not the amide centre of dihexyl-N,N-diethylcarbamoylmethylene phosphonate (DHDECMP) is presented. The procedure is a rapid method of elucidating bonding modes in similar extractants by observing line broadening of proton NMR peaks induced by Gd(III).

ISSN:0736-6299    

DOI:10.1080/07366299108918078

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor