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:
May. 15, 2012
Filed:
Jun. 11, 2010
Hiroto Sugahara, Echizen, JP;
Kazuaki Sakaki, Echizen, JP;
Takehisa Minowa, Echizen, JP;
Hirochika Naganawa, Ibaraki, JP;
Kojiro Shimojo, Ibaraki, JP;
Hiroto Sugahara, Echizen, JP;
Kazuaki Sakaki, Echizen, JP;
Takehisa Minowa, Echizen, JP;
Hirochika Naganawa, Ibaraki, JP;
Kojiro Shimojo, Ibaraki, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Japan Atomic Energy Agency, Ibaraki, JP;
Abstract
Solvent extraction from an aqueous phase containing first and second rare earth elements is carried out by contacting an organic phase containing a diglycolamic acid as an extractant and a hydrocarbon or a low-polar alcohol as a solvent, with the aqueous phase below pH 3 for extracting the first rare earth element into the organic phase, back-extracting from the organic phase with an aqueous acid solution for recovering the first rare earth element, and recovering the second rare earth element which has not been extracted into the organic phase and has remained in the aqueous phase.