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Application of cyclophane amide compound containing three central hydrogen bonds as extracting agent in separation of rare-earth elements

A technology of cycloarylamide and light rare earth elements, which is applied in the field of separation of rare earth elements, can solve the problems of unsatisfactory extraction effect, and achieve the effect of fast extraction and phase separation

Inactive Publication Date: 2012-06-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Crown ethers contain multiple oxygen atoms so that they can form complexes with rare earth metals. Although many documents have reported that crown ethers can extract rare earth elements from water into organic phases (reference: US4726938; Andrew H. Bond, MarkL. Dietz, and Renato Chiarizia, Ind.Eng.Chem.Res. 2000, 39, 3442–3464), but only a single crown ether is used to extract rare earth elements, the extraction effect is not ideal, and it is necessary to increase the extraction of rare earth elements by adding a synergistic extractant Extraction rates of elements such as trichloroacetic acid, trifluoroacetic acid, β-diketones (ref: S.V. Demin, V.I. Zhilov, A.Yu. Tsivadze, V.V. Yakshin, O.M. Vilkova, Russian Journal of Inorganic Chemistry, 2009, 54, 3 , 385–388; Yoshihiro Meguro, Yoshihiro Kitatsuji, Takaumi Kimura, Zenko Yoshida, Journal of Alloys and Compounds, 1998, 790–793)

Method used

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  • Application of cyclophane amide compound containing three central hydrogen bonds as extracting agent in separation of rare-earth elements
  • Application of cyclophane amide compound containing three central hydrogen bonds as extracting agent in separation of rare-earth elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The application of cyclic aromatic amide compounds containing three-center hydrogen bonds as extractants in the separation of rare earth elements, the extraction results are shown in Table 1:

[0029] In the ring aromatic amide compound containing triple-center hydrogen bond, R is C 11 h 23

[0030] The molar ratio of extractant to rare earth element is 1:1

[0031] The extractant was diluted with dichloromethane to a concentration of 1×10 -4 mol / L

[0032] The aqueous phase is a lanthanide inorganic salt: the concentration (Ln(NO 3 ) 3 ): 1×10 -4 mol / L

[0033] Temperature: 20°C; Phase: 1 / 1; Shaking: 1 hour

[0034] Table 1

[0035] element E(%) D La 93 13.3 Ce 90 9.0 Pr 91 10.1 Nd 91 10.1 SM 94 15.7 Eu 90 9.0 Gd 95 19.0

[0036] E is the extraction rate and D is the partition coefficient.

Embodiment 2

[0038] The application of cyclic aromatic amide compounds containing three-center hydrogen bonds as extractants in the separation of rare earth elements, the extraction results are shown in Table 2:

[0039] In the ring aromatic amide compound containing triple-center hydrogen bond, R is C 12 h 25

[0040] The molar ratio of extractant to rare earth element is 1:1

[0041] The extractant was diluted with chloroform to a concentration of 1×10 -4 mol / L

[0042] The aqueous phase is a lanthanide inorganic salt: the concentration (Ln(NO 3 ) 3 ): 1×10 -4 mol / L

[0043] Temperature: 20°C; Phase: 1 / 1; Shaking: 1 hour

[0044] Table 2

[0045] element E(%) D La 92 11.5 Ce 94 15.7 Pr 90 9.0 Nd 95 19.0 SM 89 8.1 Eu 93 13.3 Gd 91 10.1

[0046] E is the extraction rate and D is the partition coefficient.

Embodiment 3

[0048] The application of cyclic aromatic amide compounds containing three-center hydrogen bonds as extractants in the separation of rare earth elements, the extraction results are shown in Table 3:

[0049] In the ring aromatic amide compound containing triple-center hydrogen bond, R is C 16 h 33

[0050] The molar ratio of extractant to rare earth element is 1:1

[0051] The extractant was diluted with dichloromethane to a concentration of 1×10 -4 mol / L

[0052] The aqueous phase is a lanthanide inorganic salt: the concentration (Ln(NO 3 ) 3 ): 1×10 -4 mol / L

[0053] Temperature: 20°C; Phase: 1 / 1; Shaking: 1 hour

[0054] table 3

[0055] element E(%) D La 92 11.5 Ce 78 3.5 Pr 90 9.0 Nd 93 13.3 SM 86 6.1 Eu 90 9.0 Gd 92 11.5

[0056] E is the extraction rate and D is the partition coefficient.

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PUM

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Abstract

The invention relates to application of a cyclophane amide compound containing three central hydrogen bonds as an extracting agent in separation of rare-earth elements, wherein, the cyclophane amide compound containing the three central hydrogen bonds is applied to the separation of the rare-earth elements. The cyclophane amide extracting agent containing the three central hydrogen bonds has single composition, good chemical stability and less consumption; the extracting agent can carry out extraction in neutral solution; the dissolubility of the extracting agent in different solvents can be adjusted through an R group; and the extracting agent further has the advantages of fast extraction speed, fast phase separation speed and the like while extracting the rare-earth elements. Therefore,the cyclophane amide containing the three central hydrogen bonds is taken as a novel extracting agent for extracting and separating the rare-earth elements has practical application prospect.

Description

technical field [0001] The present invention relates to a new application of a class of ring aromatic amide compounds, more specifically, the invention relates to the application of a class of ring aromatic amide compounds containing three-center hydrogen bonds as extraction agents in the separation of rare earth elements. Background technique [0002] Rare earth elements include lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb) , dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu) and two elements closely related to the 15 elements of the lanthanide series - scandium (Sc) And yttrium (Y) a total of 17 elements, of which lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu) are light rare earth elements, Gadolinium (Gd), Terbium (Tb), Dysprosium (Dy), Holmium (Ho), Erbium (Er), Thulium (Tm), Yt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C233/64C22B3/36C22B59/00
CPCY02P10/20
Inventor 袁立华钟利健冯文陈龙
Owner SICHUAN UNIV
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