Comparative study on Ce (III) and La (III) solvent extraction and separation from a nitric acid medium by D2EHPA and Cyanex272

Abstract

The solvent extraction of Cerium(III) and Lanthanum(III) from nitric acid solution using the organophosphorous extractants Di-(2-ethyl hexyl) phosphate (D2EHPA) and di-2,4,4- trimethylpentyl phosphoric acid (Cyanex272) in kerosene was investigated. In this study, the magnitude of the extraction of Ce(III) was found to be more significant with Cyanex272 than D2EHPA. D2EHPA was found to be a better extractant for La(III). Among the two extractants, Cyanex272 was used for the separation of Ce from La in three stages with an extraction efficiency of 90.2% for Ce. A 556 mg/L Ce solution was used for the scrubbing of La with an efficiency of ≈34%, which required multi stage scrubbing. The study of thermodynamic parameters such as enthalpy, entropy, and Gibbs free energy impart the exothermic and non-spontaneous process. The chemical speciation curves for lanthanum and cerium in the aqueous phase as a function of pH showed that the free La(III) and Ce(III) metal ion species were largely predominate between a pH = 0 and pH = 7.

Synthesis of Quaternary Ammonium Lignin Based Ionic Liquids and Comparison of Extraction Behavior of Co(II) and Ni(II) with 2-Ethylhexyl Phosphoric Acid Mono-2-ethylhexyl Ester

“…Di(2ethylhexyl)phosphoric acid (D2EHPA or P204) [37,38], hexyl phosphonic acid mono-2-ethyl-hexyl ester (P507 or PC88A) [39], Bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex272) [40] were most widely used, the three extraction solvent acid decreased gradually enhanced the ability of separation of cobalt and nickel in turn. D2EHPA can extract many metallic cations from various Carboxylates [41], Citrate [42][43][44], chloride [37,38,45], nitric [46,47], and sulfate [48][49][50]solutions. After the first commercial process using D2EHPA, P507 was developed and widely used in base-metal solvent extraction [39].…”

Synthesis of Quaternary-Ammonium-Lignin-Based Ionic Liquids and Comparison of Extraction Behavior of Co(II) and Ni(II) with 2-Ethylhexyl Phosphoric Acid Mono-2-Ethylhexyl Ester

“…Among these acids, D2EHPA was the most commonly used solvent. D2EHPA can extract various metallic cations from various Carboxylates [43], Citrate [44][45][46], chloride [47], nitric [48,49], and sulfate [50,51] solutions. After the first commercial process using D2EHPA, P507 was developed and widely used in base-metal solvent extraction [41].…”

Efficient Separation of Nd(III) and La(III) Via Supported Liquid Membrane Using EHEHPA (P507) as a Carrier

“…Various extractants have been reported to extract and separate REEs [11,[22][23][24][25]. The most common extractants can be classified as cation exchangers (or acidic extractants), solvation extraction (neutral extractants), and anion exchangers (basic extractants).…”