scholarly journals Solvent Extraction of Didymium by TBP, Aliquat 336 and HDEHP in The Presence of Ca(NO3)2

2020 ◽  
Vol 10 (6) ◽  
pp. 2032
Author(s):  
Petr I. Matveev ◽  
Vladimir G. Petrov
Keyword(s):  
Nitric Acid ◽  
Extraction Efficiency ◽  
Calcium Nitrate ◽  
High Capacity ◽  
Water Soluble ◽  
Complexing Agents ◽  
Aliquat 336 ◽  
Influence Of Water ◽  
Cation Extraction ◽  
Extraction Isotherms

Three commercially available extractants (tri-butyl-phosphate (TBP), di-(2-ethylhexyl)phosphoric acid (HDEHP) and Aliquat 336 (a mixture of quaternary ammonium bases)) were tested for separation of Pr(III) and Nd(III) in both static and dynamic modes. In the case of HDEHP, phase stability and influence of nitric acid were considered. Extraction isotherms were constructed, and influence of water-soluble complexing agents on the separation factor was investigated for Aliquat 336. In the case of TBP, influence of calcium nitrate in aqueous phase on the extraction efficiency was investigated. Model countercurrent experiments were conducted for TBP and Aliquat 336. It was shown that TBP is the best choice due to its high capacity and cation extraction order (Nd > Pr).

Dysprosium (Dy) Separation from Yttrium Concentrate in Nitric Acid Solution Using Aliquat 336 Solvent

2020 ◽  
Vol 840 ◽  
pp. 573-579
Author(s):  
Kris Tri Basuki ◽  
Ridwan Arifudin ◽  
Wahyu Rachmi Pusparini ◽  
Andri Saputra
Keyword(s):  
Nitric Acid ◽  
Separation Factor ◽  
Extraction Efficiency ◽  
Nitric Acid Concentration ◽  
Main Concern ◽  
Aliquat 336 ◽  
Distribution Constant ◽  
Solvent Concentration ◽  
Feed Concentration ◽  
Stirring Time

Similarity of chemical and physical properties between rare-earth elements (REEs) and Dy is the main concern in order to get Dy with high purity, which it is necessary to do separation by extraction process. The purpose of this research is to obtain the optimum condition of operation (stirring time and rate, concentration of nitric acid, feed, and solvent) and determine the distribution constant, separation factor, and extraction efficiency of Dy using Aliquat 336. This research was conducted by varying stirring time (10, 15, 20, 30, 40 minutes), stirring rate (100, 150, 200, 250, 300 rpm), nitric acid concentration (2, 3, 4, 5, 6 N), feed concentration (25,000; 50,000; 100,000; 150,000; 200,000 ppm) and solvent concentration (10, 20, 30, 40, 50 % v/v). The optimum result is achieved when operation is carried out at stirring 100 rpm about 15 minutes in nitric acid 3 N with 100,000 ppm of feed concentration using 30% solvent concentration (v/v) which extract more Dy element than Yttrium (Y) and Godolinium (Gd). The highest distribution constant of Dy is 0.427, separation factor of Dy-Y is 6.831, separation factor of Dy-Gd is 1.799, and extraction efficiency of Dy is 31.604%.

Liquid–Liquid Equilibrium in the Nitric Acid + Calcium Nitrate + Water + Tri-n-octylamine System

2021 ◽  
Vol 66 (2) ◽  
pp. 890-898
Author(s):  
Yuqing Cao ◽  
Xiaolu Hu ◽  
Jingli Wu ◽  
Kun Zhou
Keyword(s):  
Nitric Acid ◽  
Calcium Nitrate ◽  
Liquid Equilibrium

Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajesh B. Gujar ◽  
Parveen K. Verma ◽  
Prasanta K. Mohapatra ◽  
Mudassir Iqbal ◽  
Jurriaan Huskens ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Solvent Extraction ◽  
Extraction Efficiency ◽  
Minor Actinide ◽  
Acid Solutions ◽  
Extraction Mechanism ◽  
Nitrate Ion ◽  
Nitric Acid Solutions ◽  
Actinide Ions ◽  
Acid Extractant

Abstract Neptunium is one of the most important minor actinide elements with some of its isotopes having very long half-lives, therefore necessitating its separation from acidic radioactive wastes. Solvent extraction of Np4+ and NpO2 2+ was studied using three multiple diglycolamide (DGA) extractants with n-propyl, n-octyl and 3-pentyl substituents termed as L I , L II and L III , respectively, in a mixed diluent of 5% isodecanol and 95% n-dodecane. For comparison purpose, the extraction of Pu4+ and UO2 2+ was carried out under identical conditions. The extraction efficiency of the ligands for the tetravalent ions followed the trend: L II  > L I  > L III , which changed to L III  > L II  > L I for the hexavalent ions. While the extraction of the tetravalent ions was reasonably good (ca. 90–98%) with an extremely low (5.0 × 10−5 M) ligand concentration, poor extraction (ca. 5–16%) of the hexavalent ions was seen even with a 20 times higher concentration of the ligand. In general, Pu4+ was better extracted than Np4+, while NpO2 2+ was marginally better extracted then UO2 2+. A ‘solvation’ type extraction mechanism was proposed based on the extraction profiles obtained as a function of the concentrations of the feed nitric acid, extractant as well as nitrate ion. The extracted species were found out to be M(NO3)4·mL and MO2(NO3)2·nL (M = Np or Pu, 1 < m < 2, n ≃ 1).

Influence of water-soluble derivatives of [60]fullerene on therapeutically important targets related to neurodegenerative diseases

MedChemComm ◽  
2014 ◽  
Vol 5 (11) ◽  
pp. 1664-1668 ◽  
Author(s):  
R. A. Kotelnikova ◽  
A. V. Smolina ◽  
V. V. Grigoryev ◽  
I. I. Faingold ◽  
D. V. Mischenko ◽  
...  
Keyword(s):  
Neurodegenerative Diseases ◽  
Cognitive Functioning ◽  
Water Soluble ◽  
Neuroprotective Agents ◽  
Fullerene Derivatives ◽  
Influence Of Water ◽  
Derivatives Of

Water soluble fullerene derivatives I and II were shown to behave as promising neuroprotective agents that improve cognitive functioning in animals.

Assessment of the Efficiency of Aliquat 336+Rice Bran Oil for Separation of Acrylic Acid from Aqueous Solution Using Reactive Extraction

2018 ◽  
Vol 16 (9) ◽  
Author(s):  
Himangshu Mondal ◽  
Kanti Kumar Athankar ◽  
Kailas L. Wasewar
Keyword(s):  
Acrylic Acid ◽  
Rice Bran ◽  
Renewable Resources ◽  
Extraction Efficiency ◽  
Process Development ◽  
Rice Bran Oil ◽  
Reactive Extraction ◽  
Aliquat 336 ◽  
Proposed Model ◽  
Predicted Values

Abstract Biomass is an attractive target in process development for the emerging renewable resources based bio-refinery industry. Due to the ample range of application of acrylic acid, its production through bio-route received more awareness in scientific fraternity. In this view, an attempted was made to study the reactive extraction of acrylic acid with aliquat 336 in rice bran oil. Moreover, Box-Behnken matrix was employed to corroborate the effects of process variables viz. concentration of acrylic acid [CAA]aq, concentration of aliquat 336 [CR4N+Cl], and temperature on the extraction efficiency (η%). In physical extraction, average extraction efficiency was found in the order as: 43.55 > 35.36 > 29.14 at 303 K, 323 K, and 343 K respectively in rice bran oil. The correlation coefficient, R2 = 0.988 % indicates the appropriateness of proposed model to predict the extraction efficiency in terms of independent variables, and the predicted values were found in close agreement with that of experimental results. Further, R2(Pred) = 0.806 is in reasonable agreement with the R2(Adj) = 0.972. The optimum conditions for extraction of acrylic acid using aliquat 336 as an extractant in rice bran oil are [CAA]aq = 0.0.5 (mol/kg); [CR4N+Cl] = 1.98 (mol/kg); temperature = 323 K and the model predicted extraction efficiency 77.5 % was found to be an excellent fit with the experimental value 75 %. Further, number of theoretical stages was found to be 3 and S/F ratio 0.247.

Dissolution of metallic platinum as water soluble species by naturally occurring complexing agents

1998 ◽  
Vol 129 (3-4) ◽  
pp. 189-194 ◽  
Author(s):  
S�nnke Lustig ◽  
Shuliang Zang ◽  
Wollgong Beck ◽  
Peter Schramel
Keyword(s):  
Water Soluble ◽  
Complexing Agents ◽  
Metallic Platinum ◽  
Naturally Occurring ◽  
Soluble Species

Spectrophotometric investigation of sensitive complexing agents for the determination of zinc in serum.

1985 ◽  
Vol 31 (8) ◽  
pp. 1310-1313 ◽  
Author(s):  
R Homsher ◽  
B Zak
Keyword(s):  
Trace Metal ◽  
Atomic Absorption ◽  
Serum Zinc ◽  
Atomic Absorption Spectrophotometry ◽  
Molar Absorptivity ◽  
Water Soluble ◽  
The Other ◽  
Complexing Agents ◽  
Absorption Spectrophotometry

Abstract Of two sensitive complexometric reagents for the colorimetry of serum zinc that we investigated, one, 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (Br-PADAP), was found to be a potentially useful compound for trace-metal determinations. It has a high molar absorptivity (120 000 L mol-1 cm-1) but is not convenient to use because it is not very soluble in water. The other reagent, a related pyridylazo compound, is 2-(5-bromo-2-pyridylazo)-5-(N-n-propyl-N-3-sulfopropylamino)phenol (5-BR-PAPS). It seems better suited for use in routine zinc determinations because, besides being water soluble, it has a higher molar absorptivity, 130 000 L mol-1 cm-1. Results by the proposed method developed with 5-Br-PAPS correlated well with those by atomic absorption spectrophotometry. The between-run CV for control sera was less than 5%; the within-run CV (same controls) was less than 4%.

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