Mass transfer kinetics of lanthanum (III) extraction in the presence of two complexing agents by D2EHPA using a constant interfacial area cell with laminar flow

Yin, Shaohua; Li, Shiwei; Zhang, Bo; Peng, Jinhui; Zhang, Libo

doi:10.1016/j.cherd.2015.07.022

Cited by 25 publications

(2 citation statements)

References 17 publications

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“…However, EHEHPA has lower extraction efficiency in comparison with D2EHPA. The use of extractant blends of D2EHPA with various agents also demonstrates some improvements in extraction and separation processes [30][31][32] but does not eliminate all drawbacks of the base extractant. Hence, an active search for new highly efficient extractants and accurate study of their extraction properties are still of utmost actuality.…”

Section: Introductionmentioning

confidence: 99%

Linear 2-Ethylhexyl Imidophosphoric Esters as Effective Rare-Earth Element Extractants

Bredov¹,

Gorlov²,

Esin³

et al. 2020

Applied Sciences

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Imidophosphoric organic esters containing phosphoryl groups are potential polydentate ligands and promising extractants of rare-earth elements. For their preparation, a monophosphazene salt [PCl3=N−PCl3]+[PCl6]− and short phosphazene oligomers of the general formula [Cl–(PCl2=N)n–PCl3]+[PCl6]−, where n = 4–7, were synthesized via living cationic polymerization of Cl3P=NSiMe3 and used as starting compounds. All phosphazenes were reacted with 2-ethylhexanol to obtain the corresponding esters of imidophosphoric acids (EIPAs). The formation of imidophosphoric acids occurs due to the phosphazene-phosphazane rearrangement of –P(OR)2=N– or –P(OH)(OR)=N– units, where R = 2-ethylhexyl. The prepared EIPAs were characterized by 1H, 31P NMR, and MALDI-TOF analyses and their extractive capacity towards lanthanide ions in aqueous solutions of nitric acid was examined. The EIPAs are mixtures of mono-, di-, and trifunctional compounds of the type HxA, where x = 1–3, which can form chelate complexes of lanthanide ions [Ln(A)z], where z = 3–6, depending on the chain length. The longer chain EIPAs are more suitable for collective rare-earth elements extraction. A comparison of the extraction properties of the EIPAs with the industrially used polyalkylphosphonitrilic acid (PAPNA) was drawn.

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Section: Introductionmentioning

confidence: 99%

Linear 2-Ethylhexyl Imidophosphoric Esters as Effective Rare-Earth Element Extractants

Bredov¹,

Gorlov²,

Esin³

et al. 2020

Applied Sciences

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“…Recently, transformation of light alkanes into aromatics with high added value has attracted considerable attention. The aromatization process is accompanied by side reactions such as pyrolysis and coking 11 , and thus requires careful selection of catalysts. In recent years, molecular sieves such as HZSM-5 12 , ZSM 13 , and Y 14 have been widely used to design catalysts for aromatization of light alkanes.…”

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confidence: 99%

Investigation of Y/SBA Composite Molecular Sieves Morphology Control and Catalytic Performance for n-Pentane Aromatization

Shi

et al. 2016

Sci Rep

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Using Y molecular sieve as the core, Y/SBA-15 composite molecular sieves were prepared by different crystallization methods in the paper. The growth process and morphologies of the composite molecular sieves were controlled by adjusting the synthesis factors. The structures and acidity of two kinds of composite molecular sieves were characterized by X-ray diffraction (XRD), N2 adsorption/desorption, transmission electron microscopy (TEM), and NH3-TPD. The catalysis performances of the composite molecular sieves were investigated in the aromatization reaction of n-pentane. The results indicated that the desired core-shell composite molecular sieves were obtained when the crystallization conditions were 36 hours, 100 °C and secondary crystallization. The aromatization results showed that core-shell composite molecular sieves had better selectivity for producing high application value xylenes compared to mixed-crystal composite molecular sieves.

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Synthesis and characteristics of Ce modified HY/SBA-15 and its desulfurization performance for simulated oil

Shi

Chen

et al. 2016

J Porous Mater

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Mass transfer kinetics of lanthanum (III) extraction in the presence of two complexing agents by D2EHPA using a constant interfacial area cell with laminar flow

Cited by 25 publications

References 17 publications

Linear 2-Ethylhexyl Imidophosphoric Esters as Effective Rare-Earth Element Extractants

Linear 2-Ethylhexyl Imidophosphoric Esters as Effective Rare-Earth Element Extractants

Investigation of Y/SBA Composite Molecular Sieves Morphology Control and Catalytic Performance for n-Pentane Aromatization

Synthesis and characteristics of Ce modified HY/SBA-15 and its desulfurization performance for simulated oil

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