2021
DOI: 10.1002/slct.202101647
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Improved Extraction of Rare Earths of La, Ce, Pr, and Nd by Optimizing the Structure of Phenoxyacetic Acid

Abstract: A novel extractant, 2‐(2‐heptanoylphenoxy)acetic acid (HA), was synthesized and applied to extract La, Ce, Pr, and Nd from the hydrochloric acid solution. The extraction parameters including pH, temperature, concentrations of HA and chloride ion were investigated and discussed in detail. The extraction mechanism was studied with Fourier‐transform infrared (FT‐IR) spectroscopy. Compared with the extractant of sec‐octylphenoxy acetic acid (CA12), HA showed excellent performance and different extraction order in … Show more

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“…[17][18][19][20] Numerous extractants can be utilized for the separation of Sc and rare earths, such as bis-(2-ethylhexyl) phosphoric acid(P204), Cyanex923(C923) and bis(2,4,4-trimethylpentyl) phosphonic acid(P507). [21][22][23][24][25] Among those commercial extractants, Cytec Industries' C923 has demonstrated good selectivity for Sc. [26] However, the excellent extraction performance of C923 can only be achieved under high acidic conditions.…”
Section: Introductionmentioning
confidence: 99%
“…[17][18][19][20] Numerous extractants can be utilized for the separation of Sc and rare earths, such as bis-(2-ethylhexyl) phosphoric acid(P204), Cyanex923(C923) and bis(2,4,4-trimethylpentyl) phosphonic acid(P507). [21][22][23][24][25] Among those commercial extractants, Cytec Industries' C923 has demonstrated good selectivity for Sc. [26] However, the excellent extraction performance of C923 can only be achieved under high acidic conditions.…”
Section: Introductionmentioning
confidence: 99%