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:
-
- Moscow, ID
- Workington, GB
- Richland, WA
- Issue Date:
- Research Org.:
- Idaho National Laboratory (INL), Idaho Falls, ID (United States)
- OSTI Identifier:
- 873305
- Patent Number(s):
- 6132491
- Assignee:
- Idaho Research Foundation, Inc. (Moscow, ID)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B22 - CASTING B22F - WORKING METALLIC POWDER
B - PERFORMING OPERATIONS B82 - NANOTECHNOLOGY B82Y - SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES
- 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 = {Sat Jan 01 00:00:00 EST 2000},
month = {Sat Jan 01 00:00:00 EST 2000}
}