Use of Surfactants to Extract a Platinum Group Metal or Gold from Organic Compositions
AssigneesCentre National De La Recherche Scientifique, Universite D'Avignon Et Des Pays De Vaucluse, Universite De Strasbourg, Commissariat A L'energie Atomique Et Aux Energies Alternatives, Ecole Nationale Superieure De Chimie De Montpellier, Universite De Montpellier
InventorsFrédéric Jean-Jacques Bihel, Damien Bourgeois, Stéphane Desgranges, Daniel Meyer, Christiane Contino-Pepin, Martine Schmitt, Patrick Hervé Denis Wagner
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Abstract
The present invention is in the field of surfactants to extract a platinum group metal or gold, in particular palladium, from organic compositions. In particular, the invention concerns the use of surfactants to back-extract a platinum group metal or gold, in particular palladium, from organic compositions further comprising an extractant of said platinum group metal or gold, in particular palladium from an aqueous solution.
Claims16
A process of extraction of at least one metal chosen from the platinum group metals and gold from a first organic liquid composition comprising:
- at least one metal chosen from the platinum group metals and gold, and
- an organic solvent, said organic solvent being water immiscible, said process comprising the following steps:
- a) contacting said first organic liquid composition with a first aqueous solution comprising a surfactant to obtain after phase separation,
- a second aqueous solution comprising the at least one metal chosen from the platinum group metals and gold and the surfactant, and
- a second organic liquid composition comprising the organic solvent;
- b) recovering of said second aqueous solution,
- said surfactant comprising:
- an hydrophobic central core of valence m equal to 1, 2 or 3;
- when m=1, a hydrophilic group G of the following formula, attached to the central core:
- wherein:
- R7 is selected from H, C|-G, alkyl and CH2ORi0;
- R10 is H or a monosaccharide selected from glucose, galactose, mannose;
- w is an integer from 1 to 30;
- when m=2 or 3, the surfactant being then a dendrimer of generation n,
- generation chains attached to the central core and branching around the core;
- and
- an hydrophilic terminal group at the end of each generation chain;
- wherein
- n is an integer from 0 to 12;
- the hydrophilic terminal group comprises:
- a mono-, oligo- or polysaccharide residue,
- a cyclodextrin residue,
- a polyethylene glycol (PEG) residue,
- a peptide residue,
- a tris(hydroxymethyl)aminoethane (Tris), or
- a 2-amino-2-methylpropane-1,3-diol;
- the central core being:
- when m=1, a -L′-W′ group,
- wherein:
- W′ is RF or a group selected from W′1, W′2 or W′3:
- RF is a C4-C10 perfluoroalkyl or a C1-C24 alkyl group,
- RH is a C1-C24 alkyl group,
- p is 0, 1, 2, 3 or 4;
- q is 0, 1, 2, 3 or 4;
- L′ is a linear or branched C1-C12 alkylene group, optionally interrupted by one or more groups Y′;
- Y′ at each occurrence is chosen from —OC(=0)-, —C(=0)0-, -0-C(=0)-NH—, —NH—C(=0)-0-, —OC(=0)-0-, —NHC(=0)-, —C(=0)-NH, —NHC(=0)NH—, —NHC(=0)0-, -0-C(=0)-NH—, —NH—, —O— or —S—;
- Y at each occurrence is chosen from —S—, —OC(=0)-, —C(=0)0-, -0-C(=0)-NH—, —NH—C(=0)-0-, —OC(=0)-0-, —NHC(=0)-, —C(=0)-NH, —NHC(=0)NH—, —NHC(=0)0-, -0-C(=0)-NH—, —NH— or -0-;
- when m=2 or 3, a group of formula (Ia) or (Ib):
- wherein:
- W is RF or a group selected from W0, W1, W2 or W3:
- RF is a C4-C10 perfluoroalkyl or a C1-C24 alkyl group,
- RH is a C1-C24 alkyl group,
- p is 0, 1, 2, 3 or 4;
- q is 0, 1, 2, 3 or 4;
- L is a linear or branched C1-C12 alkylene group, optionally interrupted by one or more -0-, —S—,
- Z is C(=0)NH or NHC(=0),
- R is a C1-C6 alkyl group, and
- e is at each occurrence independently selected from 0, 1, 2, 3 or 4.
(canceled)
An amphiphilic dendrimer of generation n comprising:
- an hydrophobic central core of valence m equal to 2 or 3;
- generation chains attached to the central core and branching around the core;
- and
- an hydrophilic terminal group at the end of each generation chain;
- wherein
- n is an integer from 0 to 12;
- the hydrophilic terminal group comprises:
- a mono-, oligo- or polysaccharide residue,
- a cyclodextrin residue,
- a polyethylene glycol (PEG) residue,
- a peptide residue,
- a tris(hydroxymethyl)aminoethane (Tris), or
- a 2-amino-2-methylpropane-1,3-diol;
- the central core being a group of formula (Ia) or (Ib):
- wherein:
- W is RF or a group selected from W0, W1, W2 or W3:
- RF is a C1-C24 alkyl group,
- RH is a C1-C24 alkyl group,
- p is 0, 1, 2, 3 or 4;
- q is 0, 1, 2, 3 or 4;
- L is a linear or branched C1-C12 alkylene group, optionally interrupted by one or more -0-, —S—,
- Z is C(-0)NH or NHC(—O),
- R is a C1-C6 alkyl group, and
- e is at each occurrence independently selected from 0, 1, 2, 3 or 4.
A compound of formula:
- W′-L′-G
- wherein:
- G is a hydrophilic group G of the following formula:
- wherein:
- R7 is selected from H, C1-C6 alkyl and CH2OR10;
- R10 is H or a monosaccharide selected from glucose, galactose, mannose;
- w is an integer from 1 to 30;
- W′ is RF or a group selected from W′1, W′2 or W′3:
- RF is a C4-C10 perfluoroalkyl or a C1-C24 alkyl group,
- RH is a C1-C24 alkyl group,
- p is 0, 1, 2, 3 or 4;
- q is 0, 1, 2, 3 or 4;
- L′ is a linear or branched C1-C12 alkylene group, optionally interrupted by one or more groups Y′;
- Y′ at each occurrence is chosen from —OC(=0)-, —C(=0)0-, -0-C(=0)-NH—, —NH—C(=0)-0-, —OC(=0)-0-, —NHC(=0)-, —C(=0)-NH, —NHC(=0)NH—, —NHC(=0)0-, -0-C(=0)-NH—, —NH—, —O— or —S—;
- Y at each occurrence is chosen from —S—, —OC(=0)-, —C(=0)0-, -0-C(=0)-NH—, —NH—C(=0)-0-, —OC(=0)-0-, —NHC(=0)-, —C(=0)-NH, —NHC(=0)NH—, —NHC(=0)0-, -0-C(=0)-NH—, —NH— or —O—;
- provided that, when G is of formula
- then L′ is interrupted by one more groups Y′.
Dependencies are inferred from the claim text.