Method for detecting, capturing and/or releasing chemical elements

Patent metadata

Field	Value
Publication number	US-10571449-B2
Application number	US-201414892317-A
Country	US
Kind code	B2
Filing date	May 20, 2014
Priority date	May 20, 2013
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

The invention relates to a method suitable for detecting, capturing and/or selectively releasing chemical elements selected from poor metals, alkalines, alkaline earths, actinides and rare earths. Said method involves a molecular assembly formed by at least one amine, and at least one aldehyde and/or an imine and/or CO 2 , or an adduct formed by the contact between an amine and CO 2 , and at least one of said chemical elements. The invention also relates to a kit for implementing said method for detection, capture and/or release.

First claim

The invention claimed is:

1. A process for capturing and separating at least one chemical element selected from p-block metals, alkali metals, alkaline earth metals, actinide metals and rare earth metals in a sample, the method comprising:
1) contacting the sample comprising said at least one chemical element with:
CO 2 and at least one amine containing at least two amine groups, or
an adduct forming by contacting CO 2 and at least one amine containing at least two amine groups,
to form a molecular assembly,
said contacting performed in a solvent selected from water and alcohol,
2) allowing the formation of a precipitate comprising said molecular assembly and separating the precipitate, and
3) dissociating the components of the molecular assembly by heating at a temperature less than or equal to 100° C. or by hydrolysis so as to release from the molecular assembly said at least one chemical element.

2. The process of claim 1 , in which at least one of the chemical elements is (a) rare earth metal(s).

3. The process of claim 1 , in which at least one of the chemical elements is (a) rare earth metal(s) selected from lanthanum and lutetium.

4. The process of claim 1 , in which the amine is of general formula (IV): R 2 —NH—R 3 , in which:
R 2 is selected from alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl and aromatic groups, the hydrocarbon chain of which is optionally interrupted by at least one heteroatom selected from N, O and S and which is optionally substituted by at least one substituent, and
R 3 is selected from a hydrogen atom, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, cycloalkynyl and aromatic groups, the hydrocarbon chain of which is optionally interrupted by at least one heteroatom selected from N, O and S and which is optionally substituted by at least one substituent, which substituent does not comprise an aldehyde CHO.

5. The process of claim 4 , in which R 2 is a linear alkyl group, the hydrocarbon chain of which is optionally interrupted by at least one heteroatom selected from N, O and S and which is optionally substituted by at least one substituent, and R 3 is a hydrogen atom.

6. The process of claim 1 , in which the amine is selected from the compounds

ethylenediamine

tris(2-aminoethyl)amine

diethylenetetramine

triethylenetetramine

piperazine

cis-1,4-cyclohexanediamine

trans-1,4-cyclohexanediamine

and phenylenediamine

7. The process of claim 1 , said process comprising filtration and/or centrifugation to separate the precipitate from the reaction medium.

8. The process of claim 1 , in which the separation makes it possible to liberate and/or reform at least one component selected from the amines and/or CO 2 forming the assembly, or one of their derivatives.

Assignees

• Univ Aix Marseille
• Centre Nat Rech Scient
• Ecole Centrale Marseille
• Univ Claude Bernard Lyon 1 Ucbl

Inventors

• Leclaire Julien
• Canard Gabriel
• Fotiadu Frédéric
• Poisson Guillaume

Classifications

• G01N33/20 Primary

  Metals · CPC title

• G01N31/02

  using precipitation {(measuring deposition or liberation of materials from an electrolyte G01N27/42)} · CPC title

• G01N31/22

  using chemical indicators (G01N31/02 takes precedence) · CPC title