2-Ethylhexylphosphonic acid mono-2-ethylhexyl ester

• CAS: 14802-03-0
• Catalog Number: ACM14802030
• Category: Main Products
• Molecular Weight: 306.42
• Molecular Formula: C16H35O3P
• Appearance: Liquid

Case Study

2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester for the Extraction of La(III) And Nd(III)

Kao, Hsiang-Chien, et al. Chemical Engineering Journal, 2006, 119(2-3), 167-174.

The equilibrium and kinetics of the extraction of mono- and di-La(III) and Nd(III) from nitrate solutions with 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (PC88A) at 298 K were studied.
· Under similar conditions, PC88A demonstrated better separation efficiency for binary Nd(III) and La(III) from nitrate solutions through solvent extraction compared to D2EHPA (di(2-ethylhexyl)phosphoric acid). The separation factor for Nd(III) over La(III) increased with a higher initial concentration ratio of Nd(III) to La(III).
· Additionally, lower pH levels and/or extractant concentrations further enhanced the separation. The extraction of Nd(III) using PC88A was favorable both thermodynamically and kinetically.
· The stoichiometry for the extraction of La(III) and Nd(III) with PC88A (HX) was represented by Eq. (5), indicating the formation of the complex MX3(HX)3. The equilibrium constants K_ex were 2.3 × 10^-5 for La(III) and 2.4 × 10^-4 for Nd(III) at 298 K.
· The rate equations for forward extraction (Rf) and backward stripping (Rb) were provided in Eqs. (14), (15), (17), and (18), with corresponding rate constants assessed at 298 K. This foundational data is crucial for the modeling and design of effective extraction devices in practical applications.

Microcapsules Based on 2-Ethylhexylphosphonic Acid Mono-2-Ethylhexyl Ester for Adsorption of Rare Earth Metals

Kondo, Kazuo, et al. Hydrometallurgy, 2015, 152, 204-213.

The adsorption of rare earth metals (including lanthanum, cerium, and praseodymium) onto microcapsules containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (EHPNA) was studied. The microcapsules with an average particle size of 143 μm contained 1.63 × 10-3 mol/g-microcapsule of EHPNA extractant. The separation of La, Ce, and Pr from La-Ce-Pr solutions using columns packed with these microcapsules was found to be the strongest at a 10 cm column packed with microcapsules, a flow rate of 0.002 L/min, and an initial metal feed solution pH of 2.0.
Preparation of the microcapsules containing EHPNA
· In the reactor, a continuous phase of distilled water containing 2 wt.% Arabic gum was stirred with a flat paddle. When the temperature of this phase reached 343 K, a dispersed phase made up of divinylbenzene (DVB), 2,2'-Azobis(2,4-dimethylvaleronitrile) (ADVN), toluene, and EHPNA was introduced. This mixture was then agitated at 300 rpm for 3 hours at 343 K under a nitrogen atmosphere. After preparation, the microcapsules were filtered from the solution, washed with distilled water, and then dried at room temperature.
· To measure the amount of extractant encapsulated within the microcapsules, 0.1 g of microcapsules was mixed with 0.05 L of methanol and left to stand for 24 hours. The microcapsules were then separated by filtration, and the EHPNA content in the methanol solution was determined through titration with a 0.05 mol/L NaOH solution, using phenolphthalein as the indicator. This allowed for the calculation of the amount of encapsulated extractant.