Equilibrium studies on the solvent extraction of some transition metals with naphthenic acid

2007 ◽  
Vol 14 (6) ◽  
pp. 250-257 ◽  
Author(s):  
A. W. Fletcher ◽  
D. S. Flett
Keyword(s):  
Solvent Extraction ◽  
Transition Metals ◽  
Naphthenic Acid ◽  
Equilibrium Studies

THE SOLVENT EXTRACTION OF CRUDE MUSTARD GAS

1947 ◽  
Vol 25f (2) ◽  
pp. 198-207
Author(s):  
R. Mungen ◽  
H. Sheffer
Keyword(s):  
Solvent Extraction ◽  
Pilot Plant ◽  
Mustard Gas ◽  
Equilibrium Studies ◽  
Counter Current

Equilibrium studies with low-boiling hydrocarbon fractions and crude mustard gas indicate that the latter can be extracted to give product purities of approximately 92.5% with 95% recovery. These values have been verified in the operation of a pilot plant for continuous counter-current extraction of crude mustard gas.

scholarly journals The Use of Dihexyldithiocarbamate in Solvent Extraction of Transition Metals

2015 ◽  
Vol 17 ◽  
pp. 184-188 ◽  
Author(s):  
Soja Siti Fatimah ◽  
Husein H. Bahti ◽  
Iwan Hastiawan ◽  
Anna Permanasari ◽  
Evamarie Hey-Hawkins
Keyword(s):  
Solvent Extraction ◽  
Transition Metals

scholarly journals Removal of naphthenic acids using activated charcoal: Kinetic and equilibrium studies

2018 ◽  
Vol 36 (7-8) ◽  
pp. 1405-1421 ◽  
Author(s):  
Natália F Campos ◽  
Celmy MBM Barbosa ◽  
Joan M Rodríguez-Díaz ◽  
Marta MMB Duarte
Keyword(s):  
Activated Charcoal ◽  
Naphthenic Acid ◽  
Naphthenic Acids ◽  
Model Mixture ◽  
Adsorptive Capacity ◽  
Order Kinetic ◽  
Equilibrium Studies ◽  
Aviation Kerosene ◽  
Equilibrium Study ◽  
Pseudo Second Order

This study proposes the use of activated charcoal made from Umbaúba wood as an adsorbent for the removal of naphthenic acid in an aviation kerosene model mixture. The activated charcoal was characterised as mesoporous with a carbon graphite profile and presented pHpzc equal to 10.5. The best working conditions were obtained for activated charcoal levels of <0.09 mm and 300 r min−1. The system reached the equilibrium after 360 min, without significant statistical difference for the pseudo-first- and pseudo-second-order kinetic models. The Weber–Morris and Boyd models corroborated the conclusion that adsorption is not controlled only by the intraparticle diffusion step. For the equilibrium study, the adsorptive capacity obtained was of 1.1 g g−1, with the Brunauer–Emmett–Teller model better correlating with the experimental data. Given the results obtained, the activated charcoal demonstrated to have a remarkable potential for removing naphthenic acid in an aviation kerosene model mixture.

scholarly journals Separation of Aluminum and Iron from Lanthanum—A Comparative Study of Solvent Extraction and Hydrolysis-Precipitation

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 556
Author(s):  
Adam Balinski ◽  
Norman Kelly ◽  
Toni Helbig ◽  
Christina Meskers ◽  
Markus Andreas Reuter
Keyword(s):  
Solvent Extraction ◽  
Organic Phase ◽  
Ph Value ◽  
Naphthenic Acid ◽  
Complete Removal ◽  
Sulfate Solution ◽  
Aluminum Concentration ◽  
Precipitation Method ◽  
Strong Increase ◽  
Ph Range

This study investigates the removal of aluminum and iron from rare earth element (REE) containing solutions by solvent extraction with saponified naphthenic acid and by hydrolysis-precipitation. The results emphasize both, the preferential application as well as limitations of every method. We find that emulsification occurring during the solvent extraction of aluminum is caused by its slow extraction rate in comparison to the neutralization reaction and by the proximity of the pH value required for aluminum extraction and the pH value at which hydrolysis of aluminum occurs. However, by choosing a long shaking time of at least 4 h, the emulsion recedes. The formation of emulsion can be avoided by strict control of pH value during the extraction. Moreover, the loading capacity of the organic phase with aluminum is limited due to the strong increase in viscosity of the organic phase with increasing aluminum concentration and due to the gel formation. Regarding the extraction of iron, the amount of extracted ions is limited due to the overlap of the pH range required for the extraction with pH range in which sparingly soluble iron oxides/hydroxides are formed. In summary, aluminum and iron can be simultaneously removed from REE-sulfate solution by solvent extraction with saponified naphthenic acid in one extraction stage only from diluted solutions. However, in comparison to the hydrolysis-precipitation method, a higher purity of the solution is achieved. A complete removal of aluminum and iron from concentrated solutions can be achieved in two stages. First, the content of aluminum and iron should be reduced by hydrolysis-precipitation. After that, a high-purity solution can be obtained by subsequent solvent extraction by saponified naphthenic acid.

scholarly journals Studies on the separation of some transition metals using trialkylimidazole as selective extractant

2017 ◽  
Vol 18 ◽  
pp. 01017
Author(s):  
Elzbieta Radzyminska-Lenarcik ◽  
Katarzyna Witt
Keyword(s):  
Aqueous Solution ◽  
Solvent Extraction ◽  
Transition Metals ◽  
Dissociation Constant ◽  
Stability Constants ◽  
Extraction Process ◽  
Ion Separation ◽  
Partition Constants

The possibility of Cu(II) ion separation from an equimolar Cu-Cd-Zn tertiary mixture by solvent extraction was investigated. The process was based on the use of 1,2,4-trimethylimidazole (TMI) and 1- decyl-2,4-dimethylimidazole (DDMI) as extractant. Dichloromethane was used as the solvent in the extraction process. The dissociation constant of extractants were found potentiometrically. Extraction data were used for finding stability constants and partition constants for the complexes being formed in the aqueous solution. For TMI, separation coefficients for Cu(II) with regard to zinc and cadmium are 2.9 and 1.3, respectively. For DDMI separation coefficients for Cu(II) with regard to zinc and cadmium are 1.4 and 1.6, respectively. Sparingly soluble in water 1-decyl-2,4-dimethylimidazole is a more useful extractant.

scholarly journals Solvent Extraction of Transition Metals by an in situ Extractant Formation Method. Utilization of an Easily-Solidfying Solvent.

1999 ◽  
Vol 15 (4) ◽  
pp. 333-337 ◽  
Author(s):  
Kaoru FUJINAGA ◽  
Mihoko FUKAI ◽  
Yasushi SEIKE ◽  
Minoru OKUMURA
Keyword(s):  
Solvent Extraction ◽  
Transition Metals ◽  
Formation Method
Sign in / Sign up

Export Citation Format

Share Document