Supercritical fluid extraction

Details Supercritical fluid extraction Supercritical fluid extraction

1991-10-21

1994-10-18

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210511, B01D 1104

Patent

active

053565380

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.

REFERENCES:
patent: 4069273 (1978-01-01), Komoto
patent: 4206132 (1980-06-01), Sievers
patent: 4464251 (1984-08-01), Kukes et al.
patent: 4845905 (1990-01-01), Schneider et al.
patent: 5169968 (1992-12-01), Rice

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