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:
Sep. 15, 2015
Filed:
Jul. 01, 2011
Kazuaki Sakaki, Echizen, JP;
Hiroto Sugahara, Echizen, JP;
Tetsuya Kume, Echizen, JP;
Masaki Ohashi, Joetsu, JP;
Hirochika Naganawa, Naka-gun, JP;
Kojiro Shimojo, Naka-gun, JP;
Kazuaki Sakaki, Echizen, JP;
Hiroto Sugahara, Echizen, JP;
Tetsuya Kume, Echizen, JP;
Masaki Ohashi, Joetsu, JP;
Hirochika Naganawa, Naka-gun, JP;
Kojiro Shimojo, Naka-gun, JP;
SHIN-ETSU CHEMICAL CO., LTD., Tokyo, JP;
JAPAN ATOMIC ENERGY AGENCY, Ibaraki, JP;
Abstract
A rare earth metal extractant containing, as the extractant component, dialkyldiglycol amide acid which is excellent in breaking down light rare earth elements is reacted in diglycolic acid (X mol) and an esterification agent (Y mol) at a reaction temperature of 70° C. or more and for a reaction time of one hour or more such that the mol ratio of Y/X is 2.5 or more, and is subjected to vacuum concentration. Subsequently, a reaction intermediate product is obtained by removing unreacted products and reaction residue. Then a nonpolar or low-polar solvent which is an organic solvent for forming an organic phase during solvent extraction of the rare earth metal and which is capable of dissolving dialkyldiglycol amide acid is added as the reaction solvent, and the reaction intermediate product is reacted with dialkyl amine (Z mol) such that the mol ratio of Z/X is 0.9 or more.