Title:
【発明の名称】金属またはメタロイドの流体抽出
Document Type and Number:
Japanese Patent JP2002501574
Kind Code:
A
Abstract:
Methods for extracting metalloid and metal species from a solid or liquid material by exposing the material to a fluid solvent, particularly supercritical CO2, 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 CO2 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.
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Inventors:
Smart neal gee
Yi Chen M
Yuherin
Kwan Yak fluff
Yi Chen M
Yuherin
Kwan Yak fluff
Application Number:
JP50902398A
Publication Date:
January 15, 2002
Filing Date:
July 25, 1997
Export Citation:
Assignee:
Idaho Research Foundation, Inc.
International Classes:
B09B3/00; C22B3/16; C22B3/20; C22B3/26; C22B3/38; C22B7/00; (IPC1-7): C22B3/20; B09B3/00
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)