METHOD FOR SYNTHESIZING RARE EARTH METAL EXTRACTANT

WIPO Patent Application WO/2012/005183

A1

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 (Xmol) and an esterification agent (Ymol) 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, and an aprotic polar solvent is added as the reaction solvent. Then, the reaction intermediate product is reacted with dialkyl amine (Zmol) such that the mol ratio of Z/X is 0.9 or more and the aprotic polar solvent is removed. As a consequence, a rare earth metal extractant is efficiently synthesized at a low cost and at a high yield without having to use expensive diglycolic acid anhydride and harmful dichloromethane.

SAKAKI KAZUAKI (JP)
SUGAHARA HIROTO (JP)
KUME TETSUYA (JP)
OHASHI MASAKI (JP)
NAGANAWA HIROCHIKA (JP)
SHIMOJO KOJIRO (JP)

PCT/JP2011/065174

January 12, 2012

July 01, 2011

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SHINETSU CHEMICAL CO (JP)
JAPAN ATOMIC ENERGY AGENCY (JP)
SAKAKI KAZUAKI (JP)
SUGAHARA HIROTO (JP)
KUME TETSUYA (JP)
OHASHI MASAKI (JP)
NAGANAWA HIROCHIKA (JP)
SHIMOJO KOJIRO (JP)

C07C231/02; C07C235/06; C22B3/26; C22B7/00; C22B59/00

JP2007327085A	2007-12-20
JPS5446719A	1979-04-12
CN1613846A	2005-05-11
JP2007327085A	2007-12-20

"Anchor chain length alters the apparent mechanism of chloride channel function in SCMTR derivatives", CHEMICAL COMMUNICATIONS, 2003, pages 308 - 309, XP055069395
See also references of EP 2592068A4

KOJIMA TAKASHI (JP)
Takashi Kojima (JP)

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