scholarly journals Stoichiometry of An(iii)–DMDOHEMA complexes formed during solvent extraction

2018 ◽  
Vol 47 (32) ◽  
pp. 10906-10914 ◽  
Author(s):  
Patrik Weßling ◽  
Michael Trumm ◽  
Andreas Geist ◽  
Petra J. Panak
Keyword(s):  
Solvent Extraction ◽  
Fission Products ◽  
Liquid Extraction ◽  
Liquid Liquid Extraction ◽  
Extraction Processes

N,N′-Dimethyl,N,N′-dioctylhexylethoxymalonamide (DMDOHEMA) is used to separate An(iii) and Ln(iii) from fission products in several liquid–liquid extraction processes that aim at recycling actinides.

Comparison of Sorption and Extraction Methods for Recovery of Trace Organics from Water

1983 ◽  
Vol 15 (6-7) ◽  
pp. 149-159 ◽  
Author(s):  
V C Blok ◽  
G P Slater ◽  
E M Giblin
Keyword(s):  
Solvent Extraction ◽  
Methylene Chloride ◽  
Extraction Methods ◽  
Liquid Extraction ◽  
Standard Mixture ◽  
Liquid Liquid Extraction ◽  
Trace Organics ◽  
Tenax Gc

Several commercially available adsorbents were compared with solvent extraction methods for their utility in recovering trace organics from water. The adsorbents examined included Amberlite XAD-2, XAD-4 and XAD-8, Ambersorb XE340 and XE348 and Tenax-GC. All were found to produce high artifact levels, even after extensive clean-up, making them unsuitable for the analysis of trace organics in water. Quantitatively, Likens-Nickerson or continuous liquid-liquid extraction with méthylene chloride gave better recoveries than the adsorbents. Qualitatively, extractive methods were preferred as they yielded much lower levels of impurities than the adsorbents. These methods of recovering trace organics were evaluated using a standard mixture of compounds added to the water at a level of 55 µg/l. Likens-Nickerson extraction gave comparable recoveries of this mixture at 55 µg/l and 11 µg/l.

scholarly journals Application of NEAT for the Simulation of Liquid-liquid Extraction Processes with Poorly Specified Feeds

2021 ◽  
Author(s):  
Fabian Jirasek ◽  
Jakob Burger ◽  
Hans Hasse
Keyword(s):  
Liquid Extraction ◽  
Target Component ◽  
Test Cases ◽  
Separation Processes ◽  
Nmr Spectrum ◽  
Liquid Liquid Extraction ◽  
Full Knowledge ◽  
Extraction Processes ◽  
Chemical Groups ◽  
Fluid Separation

The conceptual design of fluid separation processes is particularly challenging if the considered mixtures are poorly specified, since classical thermodynamic models cannot be applied when the composition is unknown. We have recently developed a method (NEAT) to predict activity coefficients in such mixtures. It combines the thermodynamic group contribution concept with the ability of NMR spectroscopy to quantify chemical groups. In the present work, we describe how NEAT can be applied to equilibrium stage simulations of liquid–liquid extraction processes with poorly specified feeds. Only a single 13C NMR spectrum of the feed is needed for predicting the distribution of a target component for different process parameters, such as temperature or extracting agent. The predictions from several test cases are compared to results that are obtained using the full knowledge on the composition of the feed and surprisingly good agreement is found.

scholarly journals Solvent Extraction And Spectrophotomteric Determination Of Cu(Ii) With Dicyclohexyl - 18- Crown-6

2013 ◽  
Vol 10 (3) ◽  
pp. 997-1004
Author(s):  
Baghdad Science Journal
Keyword(s):  
Aqueous Solution ◽  
Solvent Extraction ◽  
Correlation Coefficient ◽  
Extraction Efficiency ◽  
Molar Absorptivity ◽  
Liquid Extraction ◽  
Liquid Liquid Extraction ◽  
Coloured Complex

Liquid-Liquid Extraction of Cu(II) ion in aqueous solution by dicyclohexyl-18-crown-6 as extractant in dichloroethane was studied .The extraction efficiency was investigated by a spectrophometric method. The reagent form a coloured complex which has been a quantitatively extracted at pH 6.3. The method obeys Beer`s law over range from (2.5-22.5) ppm with the correlation coefficient of 0.9989. The molar absorptivity the stoichiometry of extracted complex is found to be 1:2. the proposed method is very sensitive and selective.

Separation and Purification of Lipases by Liquid-Liquid Extraction Processes

1996 ◽  
pp. 551-576 ◽  
Author(s):  
M. G. Carneiro-Da-Cunha ◽  
E. P. Melo ◽  
M. J. Sebastião ◽  
M. R. Aires-Barros ◽  
J. M. S. Cabral
Keyword(s):  
Liquid Extraction ◽  
Separation And Purification ◽  
Liquid Liquid Extraction ◽  
Extraction Processes

Use of combined solvent extraction-electrodeposition techniques to uranium and thorium isotopes analysis in industrial phosphoric acid, phosphate and phosphogypsum by alpha-particle spectrometry

2003 ◽  
Vol 91 (1) ◽  
Author(s):  
R. Zarki ◽  
A. Elyahyaoui ◽  
A. Chiadli
Keyword(s):  
Solvent Extraction ◽  
Phosphoric Acid ◽  
Isotopic Composition ◽  
Alpha Particle ◽  
Phosphate Rock ◽  
Liquid Extraction ◽  
Acid Phosphate ◽  
Liquid Liquid Extraction ◽  
Thorium Isotopes

SummaryA method combining liquid-liquid extraction and electrodeposition procedures is carried out to determine isotopic composition of uranium and thorium in technical wet phosphoric acid, phosphate rock and phosphogypsum leachates, by

Tuning the structure and solubility of nanojars by peripheral ligand substitution, leading to unprecedented liquid–liquid extraction of the carbonate ion from water into aliphatic solvents

2016 ◽  
Vol 45 (20) ◽  
pp. 8327-8339 ◽  
Author(s):  
Basil M. Ahmed ◽  
Brice Calco ◽  
Gellert Mezei
Keyword(s):  
Solvent Extraction ◽  
Ligand Substitution ◽  
Liquid Extraction ◽  
Hydration Energy ◽  
Carbonate Ion ◽  
Liquid Liquid Extraction ◽  
First Time

Carbonate, an anion with large hydration energy, is extracted from water by solvent extraction for the first time, using functionalized nanojars.

STUDIES OF SOLVENT EXTRACTION AND SUPPORTED LIQUID MEMBRANE WITH REACTIVE DYES FROM AQUEOUS SOLUTIONS USING ALIQUOT 336 AS CARRIER

2015 ◽  
Vol 1 (01) ◽  
pp. 54-60
Author(s):  
G Muthuraman
Keyword(s):  
Solvent Extraction ◽  
Liquid Membrane ◽  
Reactive Dyes ◽  
Extraction Process ◽  
Liquid Extraction ◽  
Supported Liquid Membrane ◽  
Liquid Liquid Extraction ◽  
Dye Transport ◽  
Stage Process ◽  
The Stability

The liquid-liquid extraction (LLE) and supported liquid membrane (SLM) studies of reactive dyes namely Gold Yellow (GYHE-R) and Reactive Green HE 4BD (RGHE-4BD) from aqueous solution using Aliquot 336 as the carrier has been investigated. Polytetrafluoroethylene (PTFE) membrane with 0.5 μm pore size has been used after impregnated with Aliquot 336 in dichloromethane. In liquid liquid extraction the following parameters had been optimized; pH of feed, diluent, carrier , strip and dye concentration and the same parameters have been applied to supported liquid membrane (SLM) study to transport dye from aqueous solution.The main advantages SLM study is; the extraction and stripping as single stage process and low consumption of carrier in the membrane phase compared to the solvent extraction process. The other parameters such as transport time, stirring speed and mechanism of dye transport has also studied by SLM. The percentage of transport of dye and flux rate increases with increasing time. The stability of membrane is satisfactory over 5 days.

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