DIGLYCOLAMIDE DERIVATIVES FOR SEPARATION AND RECOVERY OF RARE EARTH ELEMENTS FROM AQUEOUS SOLUTIONS
申请人:UT-Battelle, LLC
公开号:US20220002229A1
公开(公告)日:2022-01-06
Rare earth extractant compounds having the following structure:
wherein R
1
, R
2
, R
3
, and R
4
are independently selected from alkyl groups containing 1-30 carbon atoms and optionally containing an ether or thioether linkage connecting between carbon atoms, provided that the total carbon atoms in R
1
, R
2
, R
3
, and R
4
is at least 12; R
5
and R
6
are independently selected from hydrogen atom and alkyl groups containing 1-3 carbon atoms; and provided that at least one of the conditions (i)-(iv) apply as follows: presence of a distal branched group in at least one of R
1
-R
4
(condition i), asymmetry in R
1
-R
4
(condition ii), presence of amine-containing ring (condition iii), or presence of lactam ring (condition iv). Also described are hydrophobic water-insoluble solutions containing at least one extractant compound of Formula (1), as well as method for extracting rare earth elements from aqueous solution by contacting the aqueous solution with the water-insoluble solution.
Diglycolyl chlorides, commercially available or obtained from the corresponding dicarboxylic acids, have been converted into the corresponding diamides by reaction with a wide range of amines in an organic-aqueous biphasic system (Schotten–Baumann approach) in high yields. Treatment with poly(4-styrenesulfonic acid) afforded the pure compounds. Substituted diglycolyl diesters, obtained by coupling
Plutonium(iv) complexation by diglycolamide ligands—coordination chemistry insight into TODGA-based actinide separations
作者:Sean D. Reilly、Andrew J. Gaunt、Brian L. Scott、Giuseppe Modolo、Mudassir Iqbal、Willem Verboom、Mark J. Sarsfield
DOI:10.1039/c2cc34967a
日期:——
Complexation of Pu(IV) with TMDGA, TEDGA, and TODGA diglycolamide ligands was followed by vis-NIR spectroscopy. A crystal structure determination reveals that TMDGA forms a 1 : 3 homoleptic Pu(IV) complex with the nitrate anions forced into the outer coordination sphere.
USE OF NOVEL COMPOUNDS FOR SELECTIVELY EXTRACTING RARE EARTHS FROM AQUEOUS SOLUTIONS INCLUDING PHOSPHORIC ACID AND ASSOCIATED EXTRACTION METHOD
申请人:COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
公开号:US20180142321A1
公开(公告)日:2018-05-24
The invention relates to the use, as an extraction agent for extracting at least one rare earth from an aqueous phase including phosphoric acid, of at least one compound of the following general formula (I):
where
n is an integer equal to 0, 1 or 2,
R
1
and R
2
are H or an aliphatic hydrocarbon group,
one of R
3
and R
4
has the following formula (II):
where R
5
and R
6
are a hydrocarbon, hydroxyl or alkoxyl group, and
the other one of R
3
and R
4
has one of the following formulas (II′) and (III):
where R
5
′ and R
6
′ are a hydrocarbon, hydroxyl or alkoxyl group, and R
7
and R
8
are H or an aliphatic hydrocarbon group.
The invention also relates to a method for recovering at least one rare earth using said compound, as well as to specific compounds as such.