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Title: Extraction of metals using supercritical fluid and chelate forming legand

Abstract

A method of extracting metalloid and metal species from a solid or liquid material by exposing the material to a supercritical fluid solvent containing a chelating agent is described. The chelating agent forms chelates that are soluble in the supercritical fluid to allow removal of the species from the material. In preferred embodiments, the extraction solvent is supercritical carbon dioxide and the chelating agent is a fluorinated .beta.-diketone. In especially preferred embodiments the extraction solvent is supercritical carbon dioxide, and the chelating agent comprises a fluorinated .beta.-diketone and a trialkyl phosphate, or a fluorinated .beta.-diketone and a trialkylphosphine oxide. Although a trialkyl phosphate can extract lanthanides and actinides from acidic solutions, a binary mixture comprising a fluorinated .beta.-diketone and a trialkyl phosphate or a trialkylphosphine oxide tends to enhance the extraction efficiencies for actinides and lanthanides. The method provides an environmentally benign process for removing contaminants from industrial waste without using acids or biologically harmful solvents. The method is particularly useful for extracting actinides and lanthanides from acidic solutions. The chelate and supercritical fluid can be regenerated, and the contaminant species recovered, to provide an economic, efficient process.

Inventors:
 [1];  [2]
  1. (Moscow, ID)
  2. (Los Alamos, NM)
Issue Date:
OSTI Identifier:
871431
Patent Number(s):
5730874
Assignee:
Idaho Research Foundation, Inc. (Moscow, ID) OSTI
DOE Contract Number:  
C85-110554
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
extraction; metals; supercritical; fluid; chelate; forming; legand; method; extracting; metalloid; metal; species; solid; liquid; material; exposing; solvent; containing; chelating; agent; described; forms; chelates; soluble; allow; removal; preferred; embodiments; carbon; dioxide; fluorinated; beta; -diketone; especially; comprises; trialkyl; phosphate; trialkylphosphine; oxide; extract; lanthanides; actinides; acidic; solutions; binary; mixture; comprising; tends; enhance; efficiencies; provides; environmentally; benign; process; removing; contaminants; industrial; waste; acids; biologically; harmful; solvents; particularly; useful; regenerated; contaminant; recovered; provide; economic; efficient; species recovered; benign process; agent forms; trialkyl phosphate; removing contaminants; extracting metal; allow removal; phosphine oxide; biologically harmful; forms chelates; especially preferred; trialkylphosphine oxide; industrial waste; supercritical carbon; solvent containing; liquid material; environmentally benign; extraction solvent; metal species; preferred embodiments; supercritical fluid; carbon dioxide; preferred embodiment; particularly useful; chelating agent; mixture comprising; method provides; efficient process; fluid solvent; agent comprises; binary mixture; acidic solution; method provide; acidic solutions; contaminant species; extracting metalloid; extraction efficiencies; harmful solvents; extracting actinides; /210/134/252/423/

Citation Formats

Wai, Chien M., and Laintz, Kenneth E. Extraction of metals using supercritical fluid and chelate forming legand. United States: N. p., 1998. Web.
Wai, Chien M., & Laintz, Kenneth E. Extraction of metals using supercritical fluid and chelate forming legand. United States.
Wai, Chien M., and Laintz, Kenneth E. Thu . "Extraction of metals using supercritical fluid and chelate forming legand". United States. https://www.osti.gov/servlets/purl/871431.
@article{osti_871431,
title = {Extraction of metals using supercritical fluid and chelate forming legand},
author = {Wai, Chien M. and Laintz, Kenneth E.},
abstractNote = {A method of extracting metalloid and metal species from a solid or liquid material by exposing the material to a supercritical fluid solvent containing a chelating agent is described. The chelating agent forms chelates that are soluble in the supercritical fluid to allow removal of the species from the material. In preferred embodiments, the extraction solvent is supercritical carbon dioxide and the chelating agent is a fluorinated .beta.-diketone. In especially preferred embodiments the extraction solvent is supercritical carbon dioxide, and the chelating agent comprises a fluorinated .beta.-diketone and a trialkyl phosphate, or a fluorinated .beta.-diketone and a trialkylphosphine oxide. Although a trialkyl phosphate can extract lanthanides and actinides from acidic solutions, a binary mixture comprising a fluorinated .beta.-diketone and a trialkyl phosphate or a trialkylphosphine oxide tends to enhance the extraction efficiencies for actinides and lanthanides. The method provides an environmentally benign process for removing contaminants from industrial waste without using acids or biologically harmful solvents. The method is particularly useful for extracting actinides and lanthanides from acidic solutions. The chelate and supercritical fluid can be regenerated, and the contaminant species recovered, to provide an economic, efficient process.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {1}
}

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