The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2005
Filed:
May. 29, 2000
Alain Guy, Pontcarre, FR;
Jacques Foos, Orsay, FR;
Marc Lemaire, Villeurbanne, FR;
Frederic Chitry, Villeurbanne, FR;
Stephane Pellet-rostaing, Villeurbanne, FR;
Christel Gozzi, Lyons, FR;
Alain Guy, Pontcarre, FR;
Jacques Foos, Orsay, FR;
Marc Lemaire, Villeurbanne, FR;
Frederic Chitry, Villeurbanne, FR;
Stephane Pellet-Rostaing, Villeurbanne, FR;
Christel Gozzi, Lyons, FR;
Universite Claude Bernard Lyon 1, Villeurbanne Cedex, FR;
CNAM (Conservatoire National des Arts et Metiers), Paris Cedex, FR;
Abstract
The invention relates to the separation of lanthanides and actinides by nanofiltration complexation. The object of the invention is to satisfy the existing need for a simple, efficient and economical technique for separating lanthanides and actinides. This object is achieved by a process consisting of using ligands of the polyamino acid type, such as EDTA or DTPA, for complexing lanthanides and/or actinides before separating them by nanofiltration. The invention further relates to novel polyamino acid ligands incorporating ligand structures additional to EDTA and DTPA. Application to the production of rare earths or nuclear waste processing, especially to recycling operations carried out on spent nuclear fuels is also discussed.