Supercritical fluid extraction
Patent
·
OSTI ID:869559
- Moscow, ID
- Pullman, WA
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.
- Assignee:
- Idaho Research Foundation, Inc. (Moscow, ID)
- Patent Number(s):
- US 5356538
- OSTI ID:
- 869559
- Country of Publication:
- United States
- Language:
- English
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acids
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allow
allow removal
benign
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biologically
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carbon
carbon dioxide
chelate
chelates
chelating
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containing
contaminant
contaminant species
contaminants
crown
dioxide
dithiocarbamate
economic
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embodiments
environmentally
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exposing
extracting
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extracting metalloid
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fluid
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fluorinated
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harmful
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lipophilic
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material
metal
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metalloid
method
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preferred
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recovered
regenerated
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removing
removing contaminants
solid
soluble
solvent
solvent containing
solvents
species
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supercritical
supercritical carbon
supercritical fluid
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acids
agent
agent forms
allow
allow removal
benign
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biologically
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carbon
carbon dioxide
chelate
chelates
chelating
chelating agent
containing
contaminant
contaminant species
contaminants
crown
dioxide
dithiocarbamate
economic
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embodiments
environmentally
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exposing
extracting
extracting metal
extracting metalloid
extraction
extraction solvent
fluid
fluid extraction
fluid solvent
fluorinated
forms
forms chelates
harmful
harmful solvents
industrial
industrial waste
lipophilic
liquid
liquid material
material
metal
metal species
metalloid
method
method provide
method provides
preferred
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process
provide
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regenerated
removal
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supercritical
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