Extraction of rare earth oxides using supercritical carbon dioxide modified with Tri-n-butyl phosphate–nitric acid adducts

Baek, Donna L.; Fox, Robert V.; Case, Mary E.; Sinclair, Laura K.; Schmidt, Alex B.; McIlwain, Patrick R.; Mincher, Bruce J.; Wai, Chien M.

doi:10.1021/acs.iecr.6b00554

Title: Extraction of rare earth oxides using supercritical carbon dioxide modified with Tri-n-butyl phosphate–nitric acid adducts

Journal Article · Tue Jun 14 00:00:00 EDT 2016 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/acs.iecr.6b00554· OSTI ID:1259494

Baek, Donna L. ^[1]; Fox, Robert V. ^[1]; Case, Mary E. ^[2]; Sinclair, Laura K. ^[3]; Schmidt, Alex B. ^[4]; McIlwain, Patrick R. ^[5]; Mincher, Bruce J. ^[6]; Wai, Chien M. ^[7]

Idaho National Lab. (INL), Idaho Falls, ID (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States); Univ. of Idaho, Moscow, ID (United States)
Cornell Univ., Ithaca, NY (United States)
Boise State Univ., ID (United States)
Montana State Univ., Bozeman, MT (United States)
Idaho State Univ., Pocatello, ID (United States)
Univ. of Idaho, Moscow, ID (United States)

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. Furthermore, the water and acid concentrations in the different adducts were found to play a significant role in rare earth oxide extraction efficiency.

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Research Organization:: Idaho National Lab. (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1259494

Report Number(s):: INL/JOU-16-37836; PII: S0029549315005956

Journal Information:: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research; ISSN 0888-5885

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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Lanthanide extraction selectivity of a tripodal carbamoylmethylphosphine oxide ligand system Patterson, Michael G.; Mulville, Andrew K.; Connor, Emily K. Dalton Transactions, Vol. 47, Issue 40 https://doi.org/10.1039/c8dt02239a	journal	January 2018
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