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Title: Fluid extraction using carbon dioxide and organophosphorus chelating agents

Abstract

Methods for extracting metalloid and metal species from a solid or liquid material by exposing the material to a fluid solvent, particularly supercritical CO.sub.2, and a chelating agent are described. The chelating agent forms a chelate with the species, the chelate being soluble in the fluid to allow removal of the species from the material. In preferred embodiments the extraction solvent is supercritical CO.sub.2 and the chelating agent comprises an organophosphorous chelating agent, particularly sulfur-containing organophosphorous chelating agents, including mixtures of chelating agents. Examples of chelating agents include monothiophosphinic acid, di-thiophosphinic acid, phosphine sulfite, phosphorothioic acid, and mixtures thereof. The method provides an environmentally benign process for removing metal and metalloids from industrial waste solutions, particularly acidic solutions. Both the chelate and the supercritical fluid can be regenerated and the contaminant species recovered to provide an economic, efficient process.

Inventors:
 [1];  [1];  [1];  [1]
  1. (Moscow, ID)
Issue Date:
OSTI Identifier:
871988
Patent Number(s):
5840193
Assignee:
Idaho Research Foundation (Moscow, ID) OSTI
DOE Contract Number:  
CC-S-588193-002-C
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
fluid; extraction; carbon; dioxide; organophosphorus; chelating; agents; methods; extracting; metalloid; metal; species; solid; liquid; material; exposing; solvent; particularly; supercritical; agent; described; forms; chelate; soluble; allow; removal; preferred; embodiments; comprises; organophosphorous; sulfur-containing; including; mixtures; examples; monothiophosphinic; acid; di-thiophosphinic; phosphine; sulfite; phosphorothioic; method; provides; environmentally; benign; process; removing; metalloids; industrial; waste; solutions; acidic; regenerated; contaminant; recovered; provide; economic; efficient; removing metal; species recovered; benign process; agent forms; extracting metal; allow removal; industrial waste; liquid material; environmentally benign; extraction solvent; metal species; preferred embodiments; supercritical fluid; carbon dioxide; preferred embodiment; waste solutions; chelating agents; chelating agent; method provides; waste solution; efficient process; fluid solvent; agent comprises; acidic solution; method provide; acidic solutions; contaminant species; moving metal; extracting metalloid; fluid extraction; particularly supercritical; phosphinic acid; /210/405/435/

Citation Formats

Smart, Neil G., Wai, Chien M., Lin, Yuehe, and Kwang, Yak Hwa. Fluid extraction using carbon dioxide and organophosphorus chelating agents. United States: N. p., 1998. Web.
Smart, Neil G., Wai, Chien M., Lin, Yuehe, & Kwang, Yak Hwa. Fluid extraction using carbon dioxide and organophosphorus chelating agents. United States.
Smart, Neil G., Wai, Chien M., Lin, Yuehe, and Kwang, Yak Hwa. Thu . "Fluid extraction using carbon dioxide and organophosphorus chelating agents". United States. https://www.osti.gov/servlets/purl/871988.
@article{osti_871988,
title = {Fluid extraction using carbon dioxide and organophosphorus chelating agents},
author = {Smart, Neil G. and Wai, Chien M. and Lin, Yuehe and Kwang, Yak Hwa},
abstractNote = {Methods for extracting metalloid and metal species from a solid or liquid material by exposing the material to a fluid solvent, particularly supercritical CO.sub.2, and a chelating agent are described. The chelating agent forms a chelate with the species, the chelate being soluble in the fluid to allow removal of the species from the material. In preferred embodiments the extraction solvent is supercritical CO.sub.2 and the chelating agent comprises an organophosphorous chelating agent, particularly sulfur-containing organophosphorous chelating agents, including mixtures of chelating agents. Examples of chelating agents include monothiophosphinic acid, di-thiophosphinic acid, phosphine sulfite, phosphorothioic acid, and mixtures thereof. The method provides an environmentally benign process for removing metal and metalloids from industrial waste solutions, particularly acidic solutions. Both the chelate and the 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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