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Title: Method and apparatus for back-extracting metal chelates

Abstract

A method of extracting metal and metalloid species from a solid or liquid substrate using a supercritical fluid solvent containing one or more chelating agents followed by back-extracting the metal and metalloid species from the metal and metalloid chelates formed thereby. The back-extraction acidic solution is performed utilizing an acidic solution. Upon sufficient exposure of the metal and metalloid chelates to the acidic solution, the metal and metalloid species are released from the chelates into the acid solution, while the chelating agent remains in the supercritical fluid solvent. The chelating agent is thereby regenerated and the metal and metalloid species recovered.

Inventors:
 [1];  [1];  [1]
  1. Moscow, IA
Issue Date:
OSTI Identifier:
871769
Patent Number(s):
5792357
Assignee:
Idaho Research Foundation, Inc. (Moscow, ID)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
DOE Contract Number:  
CC-S-588193-002-C
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; apparatus; back-extracting; metal; chelates; extracting; metalloid; species; solid; liquid; substrate; supercritical; fluid; solvent; containing; chelating; agents; followed; formed; back-extraction; acidic; solution; performed; utilizing; sufficient; exposure; released; acid; agent; remains; regenerated; recovered; species recovered; extracting metal; solvent containing; acid solution; supercritical fluid; chelating agents; chelating agent; fluid solvent; acidic solution; metal chelate; metal chelates; chelates form; chelates formed; agents followed; liquid substrate; /210/423/

Citation Formats

Wai, Chien M, Smart, Neil G, and Lin, Yuehe. Method and apparatus for back-extracting metal chelates. United States: N. p., 1998. Web.
Wai, Chien M, Smart, Neil G, & Lin, Yuehe. Method and apparatus for back-extracting metal chelates. United States.
Wai, Chien M, Smart, Neil G, and Lin, Yuehe. Thu . "Method and apparatus for back-extracting metal chelates". United States. https://www.osti.gov/servlets/purl/871769.
@article{osti_871769,
title = {Method and apparatus for back-extracting metal chelates},
author = {Wai, Chien M and Smart, Neil G and Lin, Yuehe},
abstractNote = {A method of extracting metal and metalloid species from a solid or liquid substrate using a supercritical fluid solvent containing one or more chelating agents followed by back-extracting the metal and metalloid species from the metal and metalloid chelates formed thereby. The back-extraction acidic solution is performed utilizing an acidic solution. Upon sufficient exposure of the metal and metalloid chelates to the acidic solution, the metal and metalloid species are released from the chelates into the acid solution, while the chelating agent remains in the supercritical fluid solvent. The chelating agent is thereby regenerated and the metal and metalloid species recovered.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1998},
month = {Thu Jan 01 00:00:00 EST 1998}
}

Works referenced in this record:

Extraction of metal ions from liquid and solid materials by supercritical carbon dioxide
journal, November 1992


Effects of collection solvent parameters and extraction cell geometry on supercritical fluid extraction efficiencies
journal, March 1992


Packed microcolumn SFC coupled with photodiode array UV detector and inductively coupled plasma detector (SFC-photodiode array UV-ICP)
journal, January 1990


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


Construction of a robust stainless-steel clad fused-silica restrictor for use in supercritical fluid extraction
journal, October 1993


Comparison of methods to prevent restrictor plugging during off-line supercritical extraction
journal, September 1992


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


The use of polar modifiers in microbore supercritical fluid chromatography combined with inductively coupled plasma spectrometry
journal, January 1989


Selective extraction of mercury with ionizable crown ethers in supercritical carbon dioxide
journal, March 1995


Zum Stand der Extraktion mit komprimierten Gasen
journal, January 1981


Recovery of Metals from Aqueous Media by Extraction with Supercritical Carbon Dioxide
journal, May 1994


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