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Title: Method for separating metal chelates from other materials based on solubilities in supercritical fluids

Abstract

A method for separating a desired metal or metalloi from impurities using a supercritical extraction process based on solubility differences between the components, as well as the ability to vary the solvent power of the supercritical fluid, is described. The use of adduct-forming agents, such as phosphorous-containing ligands, to separate metal or metalloid chelates in such processes is further disclosed. In preferred embodiments, the extraction solvent is supercritical carbon dioxide and the chelating agent is selected from the group consisting of .beta.-diketones; phosphine oxides, such as trialkylphosphine oxides, triarylphosphine oxides and alkylarylphosphine oxides; phosphinic acids; carboxylic acids; phosphates, such as trialkylphosphates, triarylphosphates and alkylarylphosphates; crown ethers; dithiocarbamates; phosphine sulfides; phosphorothioic acids; thiophosphinic acids; halogenated analogs of these chelating agents; and mixtures of these chelating agents. In especially preferred embodiments, at least one of the chelating agents is fluorinated.

Inventors:
 [1];  [2];  [1]
  1. Moscow, ID
  2. Workington, GB
Issue Date:
Research Org.:
Univ. of Iowa, Iowa City, IA (United States)
OSTI Identifier:
873552
Patent Number(s):
6187911
Assignee:
Idaho Research Foundation, Inc. (Moscow, ID)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
DOE Contract Number:  
FG02-91ER75679
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; separating; metal; chelates; materials; based; solubilities; supercritical; fluids; desired; metalloi; impurities; extraction; process; solubility; differences; components; ability; vary; solvent; power; fluid; described; adduct-forming; agents; phosphorous-containing; ligands; separate; metalloid; processes; disclosed; preferred; embodiments; carbon; dioxide; chelating; agent; selected; consisting; beta; -diketones; phosphine; oxides; trialkylphosphine; triarylphosphine; alkylarylphosphine; phosphinic; acids; carboxylic; phosphates; trialkylphosphates; triarylphosphates; alkylarylphosphates; crown; ethers; dithiocarbamates; sulfides; phosphorothioic; thiophosphinic; halogenated; analogs; mixtures; especially; fluorinated; desired metal; phosphine oxide; crown ethers; especially preferred; trialkylphosphine oxide; extraction process; supercritical carbon; extraction solvent; supercritical extraction; preferred embodiments; supercritical fluid; carbon dioxide; preferred embodiment; chelating agents; chelating agent; carboxylic acids; carboxylic acid; metal chelate; separating metal; phosphine oxides; supercritical fluids; metal chelates; forming agent; separate metal; phosphinic acid; process based; materials based; /999/210/423/

Citation Formats

Wai, Chien M, Smart, Neil G, and Phelps, Cindy. Method for separating metal chelates from other materials based on solubilities in supercritical fluids. United States: N. p., 2001. Web.
Wai, Chien M, Smart, Neil G, & Phelps, Cindy. Method for separating metal chelates from other materials based on solubilities in supercritical fluids. United States.
Wai, Chien M, Smart, Neil G, and Phelps, Cindy. Mon . "Method for separating metal chelates from other materials based on solubilities in supercritical fluids". United States. https://www.osti.gov/servlets/purl/873552.
@article{osti_873552,
title = {Method for separating metal chelates from other materials based on solubilities in supercritical fluids},
author = {Wai, Chien M and Smart, Neil G and Phelps, Cindy},
abstractNote = {A method for separating a desired metal or metalloi from impurities using a supercritical extraction process based on solubility differences between the components, as well as the ability to vary the solvent power of the supercritical fluid, is described. The use of adduct-forming agents, such as phosphorous-containing ligands, to separate metal or metalloid chelates in such processes is further disclosed. In preferred embodiments, the extraction solvent is supercritical carbon dioxide and the chelating agent is selected from the group consisting of .beta.-diketones; phosphine oxides, such as trialkylphosphine oxides, triarylphosphine oxides and alkylarylphosphine oxides; phosphinic acids; carboxylic acids; phosphates, such as trialkylphosphates, triarylphosphates and alkylarylphosphates; crown ethers; dithiocarbamates; phosphine sulfides; phosphorothioic acids; thiophosphinic acids; halogenated analogs of these chelating agents; and mixtures of these chelating agents. In especially preferred embodiments, at least one of the chelating agents is fluorinated.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

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Works referenced in this record:

Extraction of Toxic Heavy Metals Using Supercritical Fluid Carbon Dioxide Containing Organophosphorus Reagents
journal, May 1997


High solubility of UO2(NO3)2·2TBP complex in supercritical CO2
journal, January 1998


Tri-n-octylphosphine sulfide:
journal, January 1965


Determination of organotin compounds in environmental samples by supercritical fluid extraction and gas chromatography with atomic emission detection
journal, February 1993


The Extraction of Americium and Light Lanthanides by HDEHDTP and Cyanex 302
journal, January 1995


Metal-chelate gas-chromatography for trace element analysis
journal, January 1982


Solvent extraction of copper by Cyanex 272, Cyanex 302 and Cyanex 301
journal, February 1995


Supercritical fluid extraction and chromatography of metal chelates and organometallic compounds
journal, March 1995


Supercritical fluid extraction of lanthanides and actinides from solid materials with a fluorinated .beta.-diketone
journal, September 1993


Observations on the solubility of surfactants and related molecules in carbon dioxide at 50°C
journal, June 1990


Solvent extraction of lanthanides with a crown ether carboxylic acid
journal, December 1986


Supercritical fluid extraction of organic and inorganic mercury from solid materials
journal, September 1993