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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
Publication Date:
Research Org.:
Univ. of Iowa, Iowa City, IA (United States)
OSTI Identifier:
873552
Patent Number(s):
US 6187911
Assignee:
Idaho Research Foundation, Inc. (Moscow, ID)
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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