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Title: Method and apparatus for dissociating metals from metal compounds extracted into supercritical fluids

Abstract

A method for dissociating metal-ligand complexes in a supercritical fluid by treating the metal-ligand complex with heat and/or reducing or oxidizing agents is described. Once the metal-ligand complex is dissociated, the resulting metal and/or metal oxide form fine particles of substantially uniform size. In preferred embodiments, the solvent is supercritical carbon dioxide and the ligand is a .beta.-diketone such as hexafluoroacetylacetone or dibutyldiacetate. In other preferred embodiments, the metals in the metal-ligand complex are copper, silver, gold, tungsten, titanium, tantalum, tin, or mixtures thereof. In preferred embodiments, the reducing agent is hydrogen. The method provides an efficient process for dissociating metal-ligand complexes and produces easily-collected metal particles free from hydrocarbon solvent impurities. The ligand and the supercritical fluid can be regenerated to provide an economic, efficient process.

Inventors:
 [1];  [1];  [2];  [3]
  1. Moscow, ID
  2. Workington, GB
  3. Richland, WA
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
OSTI Identifier:
873305
Patent Number(s):
US 6132491
Assignee:
Idaho Research Foundation, Inc. (Moscow, ID)
DOE Contract Number:  
AC07-94ID13223
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; dissociating; metals; metal; compounds; extracted; supercritical; fluids; metal-ligand; complexes; fluid; treating; complex; heat; reducing; oxidizing; agents; described; dissociated; resulting; oxide; form; fine; particles; substantially; uniform; size; preferred; embodiments; solvent; carbon; dioxide; ligand; beta; -diketone; hexafluoroacetylacetone; dibutyldiacetate; copper; silver; gold; tungsten; titanium; tantalum; mixtures; agent; hydrogen; provides; efficient; process; produces; easily-collected; free; hydrocarbon; impurities; regenerated; provide; economic; metal particle; supercritical carbon; fine particles; preferred embodiments; metal compound; metal particles; metal compounds; supercritical fluid; carbon dioxide; metal oxide; preferred embodiment; substantially uniform; reducing agent; method provides; oxidizing agent; efficient process; method provide; uniform size; resulting metal; metal-ligand complex; fine particle; hydrocarbon solvent; supercritical fluids; form fine; oxide form; oxidizing agen; ligand complex; /75/210/

Citation Formats

Wai, Chien M, Hunt, Fred H, Smart, Neil G, and Lin, Yuehe. Method and apparatus for dissociating metals from metal compounds extracted into supercritical fluids. United States: N. p., 2000. Web.
Wai, Chien M, Hunt, Fred H, Smart, Neil G, & Lin, Yuehe. Method and apparatus for dissociating metals from metal compounds extracted into supercritical fluids. United States.
Wai, Chien M, Hunt, Fred H, Smart, Neil G, and Lin, Yuehe. 2000. "Method and apparatus for dissociating metals from metal compounds extracted into supercritical fluids". United States. https://www.osti.gov/servlets/purl/873305.
@article{osti_873305,
title = {Method and apparatus for dissociating metals from metal compounds extracted into supercritical fluids},
author = {Wai, Chien M and Hunt, Fred H and Smart, Neil G and Lin, Yuehe},
abstractNote = {A method for dissociating metal-ligand complexes in a supercritical fluid by treating the metal-ligand complex with heat and/or reducing or oxidizing agents is described. Once the metal-ligand complex is dissociated, the resulting metal and/or metal oxide form fine particles of substantially uniform size. In preferred embodiments, the solvent is supercritical carbon dioxide and the ligand is a .beta.-diketone such as hexafluoroacetylacetone or dibutyldiacetate. In other preferred embodiments, the metals in the metal-ligand complex are copper, silver, gold, tungsten, titanium, tantalum, tin, or mixtures thereof. In preferred embodiments, the reducing agent is hydrogen. The method provides an efficient process for dissociating metal-ligand complexes and produces easily-collected metal particles free from hydrocarbon solvent impurities. The ligand and the supercritical fluid can be regenerated to provide an economic, efficient process.},
doi = {},
url = {https://www.osti.gov/biblio/873305}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}