Extraction of Rare Earth Oxides Using Supercritical Carbon Dioxide Modified with Tri‑n‑Butyl Phosphate–Nitric Acid Adducts

A new tri-n-butylphosphate–nitric acid (TBP–HNO3) adduct was prepared by combining TBP and fuming (90%) HNO3. The adduct was characterized, and its phase-equilibrium behavior in supercritical carbon dioxide is reported. Supercritical carbon dioxide (sc-CO2) was modified with this new adduct [TBP­(HN...

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Published in:Industrial & engineering chemistry research 2016-07, Vol.55 (26), p.7154-7163
Main Authors: Baek, Donna L, Fox, Robert V, Case, Mary E, Sinclair, Laura K, Schmidt, Alex B, McIlwain, Patrick R, Mincher, Bruce J, Wai, Chien M
Format: Article
Language:English
Subjects:
acid adduct
extraction
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
lanthanide oxides
phase equilibria
supercritical carbon dioxide
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cited_by cdi_FETCH-LOGICAL-a386t-756d8a1aedd9c7ab826c3005f7d36a8474cc6719c2d0e922c51447c4bca91cad3
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container_end_page 7163
container_issue 26
container_start_page 7154
container_title Industrial & engineering chemistry research
container_volume 55
creator Baek, Donna L
Fox, Robert V
Case, Mary E
Sinclair, Laura K
Schmidt, Alex B
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Mincher, Bruce J
Wai, Chien M
description A new tri-n-butylphosphate–nitric acid (TBP–HNO3) adduct was prepared by combining TBP and fuming (90%) HNO3. The adduct was characterized, and its phase-equilibrium behavior in supercritical carbon dioxide is reported. Supercritical carbon dioxide (sc-CO2) was modified with this new adduct [TBP­(HNO3)5.2(H2O)1.7], and the extraction efficacies of selected rare earth oxides (Y, Ce, Eu, Tb, and Dy) at 338 K and 34.5 MPa were compared with those obtained using an adduct formed from concentrated (70%) HNO3 and TBP [TBP­(HNO3)1.7(H2O)0.6]. All rare earth oxides tested with both adduct species could be extracted with the exception of cerium oxide. The water and acid concentrations in the different adducts were found to play a significant role in rare earth oxide extraction efficiency.
doi_str_mv 10.1021/acs.iecr.6b00554
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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects acid adduct
extraction
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
lanthanide oxides
phase equilibria
supercritical carbon dioxide
title Extraction of Rare Earth Oxides Using Supercritical Carbon Dioxide Modified with Tri‑n‑Butyl Phosphate–Nitric Acid Adducts
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