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1. WO1995033542 - FLUID EXTRACTION

Publication Number WO/1995/033542
Publication Date 14.12.1995
International Application No. PCT/US1995/006938
International Filing Date 02.06.1995
Chapter 2 Demand Filed 02.01.1996
IPC
B01D 11/02 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
11Solvent extraction
02of solids
B01D 11/04 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
11Solvent extraction
04of solutions which are liquid
C01F 17/00 2006.01
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE EARTH METALS
17Compounds of rare earth metals
C22B 3/16 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
3Extraction of metal compounds from ores or concentrates by wet processes
04by leaching
16in organic solutions
C22B 3/32 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
3Extraction of metal compounds from ores or concentrates by wet processes
20Treatment or purification of solutions, e.g. obtained by leaching
26by liquid-liquid extraction using organic compounds
32Carboxylic acids
C22B 3/38 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
BPRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
3Extraction of metal compounds from ores or concentrates by wet processes
20Treatment or purification of solutions, e.g. obtained by leaching
26by liquid-liquid extraction using organic compounds
38containing phosphorus
CPC
B01D 11/0203
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
11Solvent extraction
02of solids
0203with a supercritical fluid
B01D 11/0288
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
11Solvent extraction
02of solids
0288Applications, solvents
B01D 11/0403
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
11Solvent extraction
04of solutions which are liquid
0403with a supercritical fluid
B01D 11/0407
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
11Solvent extraction
04of solutions which are liquid
0403with a supercritical fluid
0407the supercritical fluid acting as solvent for the solute
B01D 11/0492
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
11Solvent extraction
04of solutions which are liquid
0492Applications, solvents used
B08B 7/0021
BPERFORMING OPERATIONS; TRANSPORTING
08CLEANING
BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
7Cleaning by methods not provided for in a single other subclass or a single group in this subclass
0021by liquid gases or supercritical fluids
Applicants
  • IDAHO RESEARCH FOUNDATION, INC. [US]/[US]
Inventors
  • WAI, Chien
  • SMART, Neil
  • LIN, Yuehe
Agents
  • SLATER, Stacey, C.
Priority Data
08/253,00002.06.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FLUID EXTRACTION
(FR) EXTRACTION DE FLUIDE
Abstract
(EN)
A method for extracting metalloid and metal species from a solid or liquid material by exposing the material to a fluid solvent, particularly supercritical carbon dioxide, containing a chelating agent is described. The chelating agent forms chelates that are soluble in the fluid to allow removal of the species from the material. In preferred embodiments, the extraction solvent is supercritical carbon dioxide and the chelating agent comprises a trialkyl phosphate, a triaryl phosphate, an alkyl-aryl phosphate, a trialkylphosphine oxide, a triarylphosphine oxide, an alkyl-arylphosphine oxide, and mixtures thereof. The method provides an environmentally benign process for removing contaminants from industrial waste. The method is particularly useful for extracting actinides from acidic solutions, and the process can be aided by the addition of salts, such as nitrate salts, and modifiers, such as water and the lower alkyl alcohols and esters. The chelate and supercritical fluid can be regenerated, and the contaminant species recovered, to provide an economic, efficient process.
(FR)
L'invention a pour objet un procédé pour extraire des espèces métalloïdes et métalliques d'un matériau solide ou liquide en exposant le matériau à un solvant fluide, en particulier, du dioxyde de carbone supercritique, contenant un agent chélateur. L'agent chélateur forme des chélates qui sont solubles dans le fluide pour permettre d'extraire des espèces de ce matériau. Dans des modes de réalisation préférés, le solvant d'extraction est du dioxyde de carbone supercritique et l'agent chélateur comprend un trialkyle phosphate, un triaryle phosphate, un alkyle-aryle phosphate, un oxyde d'alkyle-arylphosphine, et des mélanges de ces derniers. L'invention traite d'un procédé inoffensif pour l'environnement permettant d'extraire les contaminants de déchets industriels. Ce procédé est particulièrement utile pour extraire les actinides de solutions acides, et il peut être renforcé par l'addition de sels, tels que des sels de nitrate, et des agents modifiants, tels que de l'eau et des alcools et esters d'alkyle inférieur. Le chélate et le fluide supercritique peuvent être regénérés, et les espèces contaminantes récupérées pour fournir un procédé efficace et économique.
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