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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 Engineering and Environmental Laboratory, Idaho Falls, ID
OSTI Identifier:
873305
Patent Number(s):
US 6132491
Assignee:
Idaho Research Foundation, Inc. (Moscow, ID) INEEL
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. Sat . "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 = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}

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