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METHODS FOR LIQUID EXTRACTION OF RARE EARTH METALS USING IONIC LIQUIDS

United States Patent Application

20170306439
A1
View the Complete Application at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method for extracting a rare earth element from a rare earth-containing substance, the method comprising mixing the rare earth-containing substance with a protic ionic liquid, such as: ##STR00001## wherein R.sup.1 is selected from hydrogen atom and hydrocarbon groups containing 1 to 6 carbon atoms; R.sup.2 and R.sup.3 are independently selected from hydrocarbon groups containing 1 to 12 carbon atoms; and X.sup.- is an anionic species; to produce a composition of the formula (RE)(amide).sub.yX.sub.z at least partially dissolved in the protic ionic liquid, wherein RE is at least one rare earth element having an atomic number selected from 39, 57-71, and 90-103; y is 2-6; z is a number that charge balances the total positive charge of RE; and the amide is the conjugate base of the cationic portion of the protic ionic liquid of Formula (1) and has the following formula: ##STR00002##
FREIDERICH, John William (Oak Ridge, TN), LUO, Huimin (Knoxville, TN), MOYER, Bruce A. (Oak Ridge, TN), DAI, Sheng (Knoxville, TN)
15/ 135,753
April 22, 2016
GOVERNMENT SUPPORT [0002] This invention was made with government support under Prime Contract No. DE-AC05-00OR22725 awarded by the U.S. Department of Energy. The government has certain rights in the invention.