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Title: Supercritical fluid extraction

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. 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 or lipophilic crown ether or fluorinated dithiocarbamate. The method provides an environmentally benign process for removing contaminants from industrial waste without using acids or biologically harmful solvents. 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. (Pullman, WA)
Issue Date:
OSTI Identifier:
869559
Patent Number(s):
5356538
Assignee:
Idaho Research Foundation, Inc. (Moscow, ID) OSTI
DOE Contract Number:  
C85-110554
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
supercritical; fluid; extraction; method; extracting; metalloid; metal; species; solid; liquid; material; exposing; solvent; containing; chelating; agent; forms; chelates; soluble; allow; removal; preferred; embodiments; carbon; dioxide; fluorinated; lipophilic; crown; dithiocarbamate; provides; environmentally; benign; process; removing; contaminants; industrial; waste; acids; biologically; harmful; solvents; chelate; regenerated; contaminant; recovered; provide; economic; efficient; species recovered; benign process; agent forms; removing contaminants; extracting metal; allow removal; biologically harmful; forms chelates; industrial waste; supercritical carbon; solvent containing; liquid material; environmentally benign; extraction solvent; metal species; preferred embodiments; supercritical fluid; carbon dioxide; preferred embodiment; chelating agent; method provides; efficient process; fluid solvent; method provide; contaminant species; extracting metalloid; fluid extraction; harmful solvents; /210/

Citation Formats

Wai, Chien M., and Laintz, Kenneth. Supercritical fluid extraction. United States: N. p., 1994. Web.
Wai, Chien M., & Laintz, Kenneth. Supercritical fluid extraction. United States.
Wai, Chien M., and Laintz, Kenneth. Sat . "Supercritical fluid extraction". United States. https://www.osti.gov/servlets/purl/869559.
@article{osti_869559,
title = {Supercritical fluid extraction},
author = {Wai, Chien M. and Laintz, Kenneth},
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. 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 or lipophilic crown ether or fluorinated dithiocarbamate. The method provides an environmentally benign process for removing contaminants from industrial waste without using acids or biologically harmful solvents. 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 = {1994},
month = {1}
}

Patent:

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