Bis 2-ethylhexyl Phosphoric Acid Research Articles

Application of vortex assisted dispersive liquid-liquid microextraction based on a new deep eutectic solvent for microextraction of aromatic amines from simulant of kitchenware samples by HPLC-UV

This paper reports a dispersive liquid–liquid microextraction based on a novel hydrophobic deep eutectic solvent (HDES) for the extraction of aromatic amines (aniline, 4-methoxyanniline, 4,4′-diaminodiphenyl, orthotoluidine, 2,6-dimethylaniline, 2-naphtylamine) in simulant of colored kitchenware samples before their high-performance liquid chromatography determination. The HDES was prepared by mixing bis(2-ethylhexyl) phosphoric acid (BEHPA) as hydrogen bond acceptor and thymol as hydrogen bond donor. Affecting factors on the extraction of the aromatic amines were investigated and optimized. Under optimum conditions, the developed method showed a wide linear range of 1.0–200 µg L−1 (R2 ≥ 0.99) with satisfactory recoveries (≥90.0%). The empirical limit of detections (LODs) were in the range of 1.5–3.0 µg L−1. The method LOQ was 5.0 µg L−1. The enrichment factors were in the range of 170–190. The intra-day (n = 6) and inter-day (n = 3) precisions at concentration levels of 5, 50 and 200 µg L−1 were ≤ 8.1%. Based on obtained results, the proposed method is very simple, efficient, sensitive, and eco-friendly for the extraction and determination of aromatic amines in simulant of colored kitchenware samples.

Extraction of lanthanide ions from aqueous solution by modified supercritical CO 2: tri- n-butylphosphate+CO 2 and bis-2-ethylhexyl phosphoric acid+CO 2

High-pressure single-phase limit of binary tri- n-butylphosphate (TBP)+CO 2 and bis-2-ethylhexyl phosphoric acid (B2EHPA)+CO 2 was measured. By a variable-volume view-cell apparatus, the phase transition pressures of each system were measured at various phase-equilibrium conditions (313.15–333.15 K, 10–25 MPa, 3.7–18.9 mol% TBP and 1.0–45.0 mol% B2EHPA). Based on this data, supercritical fluid extraction (SFE) was carried out for lanthanide ions from acidic aqueous solution. In the first place, SFE was carried out for Nd 3+ over a wide range of conditions (0–5 M HNO 3, 313.15–333.15 K and 10–25 MPa) and optimum SFE process conditions are evaluated. In the second place, SFE was carried out at 313.15 K and 25 MPa for six types of lanthanide ions (La 3+, Ce 3+, Nd 3+, Sm 3+, Eu 3+, and Yb 3+) from 1 M HNO 3 acidic solution and the characteristics of different metals on the SFE were compared.

Separation of beryllium (II) and aluminium (III) by solvent extraction using Bis-2 ethylhexyl phosphoric acid [HDEHP

A simple and rapid method for the extraction is described for the separation of beryllium (II) and aluminium (111) from aqueous sulphate solution with Bis-2 ethylhexyl phosphoric acid (HDEHP) in toluene. A systematic study of the solvent extraction of chemically similar elements, beryllium (II) and aluminium (III) was carried out separately and it has been observed that under certain specific conditions beryllium (II) and aluminium (III) can be separated in a short period from their mixture using HDEHP as an extractant.

Liquid membrane transport of alkali metal cations with mixed carrier systems composed of phosphoric acid-crown ether having a side arm

The liquid membrane transport of alkali metal cations (Li +, Na +, and K +) across a chloroform membrane was carried out using mixed carrier systems composed of bis(2-ethylhexyl)phosphoric acid (B2EHPA) and a series of crown ethers (dioxo-13-crown-4, 13-crown-4, benzo-14-crown-4, 15-crown-5, and benzo-18-crown-6 ethers) having (benzyloxy)methyl and (benzoyloxy)methyl groups. Substituted 15-crown-5 and benzo-18-crown-6 derivatives/B2EHPA mixed carriers showed significantly enhanced transport rates of Li + and Na + compared with those of 15-crown-5/B2EHPA and benzo-18-crown-6/B2EHPA. It was revealed that the introduction of a side arm such as the (benzoyloxy)methyl group to the crown ring easily modified the selectivities of the alkali metal cations in these mixed carrier systems.

Selective extraction of praseodymium ions from neodymium solution using a non-equilibrium extraction method

An advanced method for the separation of praseodymium ions from a mixed solution of neodymium and praseodymium ions has been investigated, using a non-equilibrium extraction with diethylenetriaminepentaacetic acid (DTPA) and a bis-(2-ethylhexyl)phosphoric acid (B2EHPA)-kerosine system in which the largest value of the separation factor β Pr-Nd (= D Pr/ D Nd), i.e. 5.0, was obtained for the first time. It was found that the experimental extraction rate was represented by the reversible pseudo-first-order reaction as V = k 1″[H +] 2[Ln 3+] T,(a)- k −1″[H +][Ln 3+] (o) where subscript (a) and (o) represent aqueous and organic phases, respectively, and k 1″ and k −1″ are kinetic constants for the forward and backward reactions respectively.

Extraction of complexes of iron(III) and other metals with bis(2-ethylhexyl)phosphoric acid into molten biphenyl/naphthalene

The extraction behaviour of twelve metals as function of the concentration of nitric or hydrochloric acid is described; bis(2-ethylhexyl)phosphoric acid (BEHPA) and 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester are used as the extractants with 3:1 (w/w) biphenyl/ naphthalene (m.p. 52°C) as the molten solvent which is easily separated by cooling to room temperature. Scandium (III) and zirconium (IV) can be separated from uranium (VI), rare earth metals and some transition metals with BEHPA. The extraction behaviour of iron with both extractants is described in detail.

Extraction of metals by bis-(2-ethylhexyl) phosphoric acid in 2-ethylhexanoic acid as monomerizing diluent from an aqueous chloride phase: Th(IV) and U(VI)

The extraction of Th 4+ and UO 2 2+ from an aqueous phase into a solution of bis 2-ethylhexyl phosphoric acid, (2-C 2H 5·C 6H 12O) 2PO(OH), HDEHP, in the monomerizing diluent 2-ethylhexanoic acid has been studied in terms of the concentration of hydrogen ion in the equilibrated aqueous phase and of HDEHP in the opposing equilibrated organic phase. The extraction stoichiometries, with the corresponding expression for K in terms of F (the formality of HDEHP in the organic phase), [H +] (the concentration of hydrogen ion in the aqueous phase), and K s , for a 1.00 F (NaCl + HCl) aqueous phase, are: Th A 4++ 5HY O⇄ Th(HYO O+ 4H A + K = K sF 5 [H +] 4 UO 2A 2+ + 3HY O ⇄ UO 2( HY 3) O+ 2H A + K = K sF 3 [H +] 2 where HY represents the monomer of HDEHP and the formulations of extracted species are non committal with respect to structure. With HZ representing the monomer of 2-ethylhexanoic acid, suggested formulations of the extracted species in terms of homogeneous and heterogeneous dimers are: Th(HY 2)(HYZ) 3 and UO 2(HY 2)(HYZ). The K s values are: Th 4+ (7 × 10 4) and UO 2 2+ (2 × 10 2). Comparison of the extraction of Th 4+ and UO 2 2+ with the extraction, previously reported, of Am 3+, Eu 3+, Tm 3+ and Y 3+ in the same system is made. Application (patented) of this liquid-liquid extraction system to the purification of thorium from contaminant rare earths and yttrium is demonstrated.

Extraction of metals by bis-(2-ethylhexyl) phosphoric acid in 2-ethylhexanoic acid as monomerizing diluent from an aqueous chloride phase: Am(III), Eu(III), Tm(III) and Y(III)

The extraction of Am 3+, Eu 3+, Tm 3+ and Y 3+ from an aqueous chloride phase into a solution of bis 2-ethylhexyl phosphoric acid, (2-C 2H 5·C 6H 12O) 2PO(OH), HDEHP, in the monomerizing diluent 2-ethylhexanoic acid has been studied in terms of the concentration of hydrogen ion in the equilibrated aqueous phase and of HDEHP in the opposing equilibrated organic phase. The extraction stoichiometries, with the corresponding expression for K in terms of F (the formality of HDEHP in the organic phase), [H +](the concentration of hydrogen ion in the aqueous phase), and K S , for a 1.00 F(NaCl + HCl) aqueous phase are ▪ where HY represents the monomer of HDEHP and the formulations of extracted species are non-committal with respect to structure. With HZ representing the monomer of 2-ethylhexanoic acid, suggested formulations of the extracted species in terms of homogeneousand heterogeneous dimers are: for Am 3+, and Eu 3+, M(HYZ) 3; and for Tm 3+, Y 3+, M(HY 2) 2(HYZ). The K S values are: Am 3+(5 × 10 −3), Eu 3+(1 × 10 −2), (1 × 10 −2), Tm 3+(7) and Y 3+(2).

ChemInform Abstract: THE EXTRACTION OF SELECTED M(III) METALS BY BIS 2‐ETHYLHEXYL PHOSPHORIC ACID IN N‐HEPTANE

Chemischer InformationsdienstVolume 8, Issue 4 Physical Inorganic Chemistry ChemInform Abstract: THE EXTRACTION OF SELECTED M(III) METALS BY BIS 2-ETHYLHEXYL PHOSPHORIC ACID IN N-HEPTANE G. W. MASON, G. W. MASONSearch for more papers by this authorD. N. METTA, D. N. METTASearch for more papers by this authorD. F. PEPPARD, D. F. PEPPARDSearch for more papers by this author G. W. MASON, G. W. MASONSearch for more papers by this authorD. N. METTA, D. N. METTASearch for more papers by this authorD. F. PEPPARD, D. F. PEPPARDSearch for more papers by this author First published: January 25, 1977 https://doi.org/10.1002/chin.197704011Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume8, Issue4January 25, 1977 RelatedInformation

The extraction of selected M(III) metals by bis 2-ethylhexyl phosphoric acid in n-heptane

The extraction of Y 3+, Pm 3+, Eu 3+, Tm 3+, Lu 3+, Am 3+ and Cm 3+ from an aqueous chloride phase into a solution of (2-C 2H 5·C 6H 12O) 2PO(OH), HDEHP, in n-heptane has been studied as a function of the concentration of extractant in the organic phase and of hydrogen ion in the aqueous phase. From these data the stoichiometries of extraction have been deduced as: M A 3++2.5(HY) 2 o ⇌MY(HY 2) 2 o +3H A + where the subscripts A and O refer, respectively, to mutually equilibrated aqueous and organic phases. (The formulation of extracted entities is based solely upon established ratios and is in no sense to be interpreted in terms of established structure.) Corresponding to the stoichiometries, values of K, F and [H +] obtained from the hydrogen ion dependency plots were inserted in the equation: K= K s F a /[H +] b to obtain values of K s . ( K is the observed distribution ratio, F the equilibrium concentration of HDEHP in the organic phase, [H +] the equilibrium concentration of hydrogen ion in the aqueous phase, and a and b the respective extractant and hydrogen ion dependencies.) The equation is applied specifically to a system embodying 1.0F (NaCl + HCl) at 22±2°C. The K s ( n-neptane) value is higher than the K s (benzene) value for each of the cations studied. Comparisons with extraction systems employing ( n-C 8H 17O) 2PO(OH) and [C 4H 9C(CH 3) 2CH 2O] 2PO(OH), respectively symbolized as HDOP and HDNOP, are made.