Influence of intracrystalline ionic strength in MFI zeolites on aqueous phase dehydration of methylcyclohexanols

Extraction of hafnium(IV) was studied from solutions of mixtures of perchloric and nitric acids and of perchloric and hydrochloric acids for constant ionic strength, I = 2, 4, 6, or 8, and for cHf 4 . 10-4 mol l-1. The organic phase was constituted by solutions of some acidic or neutral organophosphorus reagents or of 2-thenoyltrifluoroacetone, 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone, or N-benzoyl-N-phenylhydroxylamine in benzene, chloroform, or n-octane. A pronounced synergic extraction of hafnium proceeds only on applying organophosphorus reagents from an aqueous phase whose acidity is not lower than 3M-(HClO4 + HNO3) or 5M-(HClO4 + HCl). The synergic effect was not affected markedly by a variation of the initial concentration of hafnium in the range 1 . 10-8 -4 .10-4 mol l-1, it lowered with increasing initial concentration of the organophosphorus reagent and decreasing concentration of the H+ ions. It is suggested that the hafnium passes into the organic phase in the form of mixed complexes, the salting-out effect of perchloric acid playing an appreciable part.

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Extraction of hafnium by means of some substituted 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-ones

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19811901 ◽

1981 ◽

Vol 46 (8) ◽

pp. 1901-1905 ◽

Cited By ~ 3

Author(s):

Oldřich Navrátil ◽

Jiří Smola

Keyword(s):

Ionic Strength ◽

Aqueous Phase ◽

Dissociation Constants ◽

Parent Substance ◽

Benzoyl Group ◽

Extraction Constants ◽

Extraction Parameters ◽

Substituted 1

Distribution between aqueous phase and benzene or chloroform was studied for 1-phenyl-3-methyl-4-benzoylpyrazol-5-ones with 2-chloro, 4-methoxy, 3-nitro, and 4-nitro substitution in the benzoyl group (ionic strength of the aqueous phase 0.1) and for hafnium in their presence (ionic strength 2.0). The distribution and dissociation constants of the reagents and the extraction constants of their hafnium complexes were determined. Hafnium was found to be extracted as the HfA4 species. The extraction parameters of the derivatives in question do not differ substantially from those of the parent substance.

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EUROPIUM OXALATE ION ASSOCIATION IN WATER

Canadian Journal of Chemistry ◽

10.1139/v66-447 ◽

1966 ◽

Vol 44 (24) ◽

pp. 3057-3062 ◽

Cited By ~ 11

Author(s):

P. G. Manning

Keyword(s):

Acetic Acid ◽

Ionic Strength ◽

Stability Constant ◽

Stability Constants ◽

Aqueous Phase ◽

Sodium Acetate ◽

Ion Association ◽

Sodium Oxalate ◽

Aqueous Sodium ◽

Oxalate Ion

The partitioning of radiotracer 152/151Eu between aqueous sodium oxalate (Na2L) solutions and toluene solutions of thenoyltrifluoroacetone (HTTA) has been studied as a function of the oxalate concentration. The pH of the aqueous phase was controlled by means of sodium acetate – acetic acid mixtures and the ionic strength (I) by NaCl or NaClO4.At low ionic strengths (~0.05) and [L] ~10−4 M EuL+ formed, but at I = 0.95 and [L] ~10−3 M EuL2− also formed. Stability constants for the 1:1 and 1:2 (metal:ligand) complexes are reported.The magnitudes of the stepwise stability constant ratios are discussed.

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Aqueous-Phase Methane Oxidation over Fe-MFI Zeolites; Promotion through Isomorphous Framework Substitution

ACS Catalysis ◽

10.1021/cs400288b ◽

2013 ◽

Vol 3 (8) ◽

pp. 1835-1844 ◽

Cited By ~ 57

Author(s):

Ceri Hammond ◽

Nikolaos Dimitratos ◽

Jose Antonio Lopez-Sanchez ◽

Robert L. Jenkins ◽

Gareth Whiting ◽

...

Keyword(s):

Methane Oxidation ◽

Aqueous Phase ◽

Mfi Zeolites

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The influence of negatively charged silica nanoparticles on the surface properties of anionic surfactants: electrostatic repulsion or the effect of ionic strength?

Physical Chemistry Chemical Physics ◽

10.1039/c9cp05475h ◽

2020 ◽

Vol 22 (4) ◽

pp. 2238-2248 ◽

Cited By ~ 3

Author(s):

Milad Eftekhari ◽

Karin Schwarzenberger ◽

Aliyar Javadi ◽

Kerstin Eckert

Keyword(s):

Ionic Strength ◽

Silica Nanoparticles ◽

Surface Properties ◽

Surface Activity ◽

Aqueous Phase ◽

Anionic Surfactants ◽

Electrostatic Repulsion ◽

Charged Nanoparticles

The presence of negatively charged nanoparticles affects the surface activity of anionic surfactants in an aqueous phase. This effect is mainly caused by the change in ionic strength of the system resulted from the addition of nanoparticles.

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Influence of Aqueous-Phase Ionic Strength and Composition on the Dynamics of Water–Crude Oil Interfacial Film Formation

Energy & Fuels ◽

10.1021/acs.energyfuels.6b01841 ◽

2016 ◽

Vol 30 (11) ◽

pp. 9170-9180 ◽

Cited By ~ 16

Author(s):

Mehrnoosh Moradi ◽

Vladimir Alvarado

Keyword(s):

Ionic Strength ◽

Crude Oil ◽

Aqueous Phase ◽

Film Formation ◽

Interfacial Film

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Extraction of iron(III) from the citric medium by the toluene solution of trilaurylamine

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19803116 ◽

1980 ◽

Vol 45 (11) ◽

pp. 3116-3129 ◽

Cited By ~ 3

Author(s):

Petr Vaňura ◽

Libor Kuča

Keyword(s):

Citric Acid ◽

Ionic Strength ◽

Aqueous Phase ◽

Organic Phase ◽

Toluene Solution ◽

Constant Ionic Strength ◽

Extraction Constants ◽

Equilibrium Concentrations

The composition of Fe(III) complexes extracted from the aqueous phase of constant ionic strength (1M-(H3,Na3,Fe)A, where H3A denotes citric acid) by the toluene solution of trilaurylamine (TLA) has been determined and the respective extraction constants have been calculated. In the concentration range cFe < 10-2 mol l-1 FeA(TLA)2 and FeA(TLA)4(H3A)2-4 are the predominant complexes in the organic phase. The abundance of the (FeA)3(TLA)6(H3A)2 complex in the organic phase increases at higher equilibrium concentrations of Fe(III) in the aqueous phase and at higher concentrations of TLA.

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