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Use and method of amino-containing neutral phosphine extractant for extracting and separating tetravalent cerium

An extractant and neutral phosphine technology, which is applied in the application field of amino-containing neutral phosphine extractant in the separation of tetravalent cerium, can solve the problems of high extraction and separation cost, high price, difficult back extraction, etc., and achieve good extraction Separation ability, reduced extraction and separation cost, simple and easy access to chemical raw materials

Active Publication Date: 2019-07-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these commonly used extractants also have different disadvantages, such as the large water solubility of the neutral phosphorus extractant TBP, and the extractant Cyanex923, which has better extraction and separation capabilities for cerium (IV) in industry, is expensive and expensive. It is not easy to obtain, which leads to high extraction and separation costs and low economic benefits. When separating single rare earths, acidic phosphorus extractants P204 and P507 have a small separation coefficient for heavy rare earths, and they are prone to precipitation during stripping, resulting in difficult stripping. High acid phosphorus extractants need to be used Disadvantages such as multiple stripping

Method used

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  • Use and method of amino-containing neutral phosphine extractant for extracting and separating tetravalent cerium
  • Use and method of amino-containing neutral phosphine extractant for extracting and separating tetravalent cerium
  • Use and method of amino-containing neutral phosphine extractant for extracting and separating tetravalent cerium

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Embodiment

[0100] In order to further illustrate the solutions of the present invention, specific examples of the present invention are provided to help those skilled in the art understand and implement the present invention, but the present invention is not limited to these examples.

[0101] Reagents and sources

[0102] Diethylhexyl phosphite, di-n-octyl phosphite, di-n-heptyl phosphite, di-isooctyl phosphite, aviation kerosene and TBP were purchased from Shanghai Laish Chemical Co., Ltd.

[0103] Paraformaldehyde, di-n-hexylamine, diisobutylamine, n-butylamine, diisooctylamine, dodecylamine, isooctylamine, dimethylamine, toluene, xylene, p-toluenesulfonic acid, and heptane purchased from Aladdin Reagent Co., Ltd.

[0104] Cyanex 923 and 2-methylheptanol were purchased from Shanghai Cyanex Chemical Co., Ltd.

[0105] Feed liquid, washing liquid and stripping agent are self-made in the laboratory.

[0106] Other reagents (such as acids, etc.) are commercially available analytical re...

preparation example 1

[0109] Preparation Example 1: Preparation of (N,N-dihexylamino)methylphosphonic acid bis(2-ethylhexyl)ester

[0110]

[0111] In a three-necked flask equipped with a mechanical stirrer, a water separator, and a condensation reflux device, add diethylhexyl phosphite (1mol), paraformaldehyde (M=30, 1.05mol), di-n-hexylamine (1.05mol) , toluene (700ml) and p-toluenesulfonic acid (2g), heated to reflux at 130°C, and the water generated by the reaction was separated. When anhydrous is produced, react for another 2 hours. 10 g of potassium carbonate was added to the reaction mixture, and heating to reflux was continued for 15 min. The reaction mixture was filtered to remove excess potassium carbonate in the reaction, washed three times with distilled water, and the toluene was removed by rotary evaporation to obtain the target product.

[0112] 1 H NMR (400MHz, CDCl 3 ,ppm): δ1.74-0.86[m,(CH 3 ) 6 ,(CH 2 ) 16 ,(CH) 2 ],2.63[m,(CH 2 )],2.95[t,CH 2 , J=8Hz], 3.96[m, (CH ...

preparation example 2

[0113] Preparation Example 2: Preparation of Dioctyl (N,N-Diisobutylamino)methylphosphonate

[0114]

[0115] Except that di-n-octyl phosphite was used to replace diethylhexyl phosphite and diisobutylamine was used to replace di-n-hexylamine, the target product was prepared by the same process as in Preparation Example 1.

[0116] 1 H NMR (400MHz, CDCl 3 ,ppm): δ1.71-0.89[m,(CH 3 ) 6 ,(CH 2 ) 12 ],2.05[m,(CH) 2 ],2.31[m,(CH 2 ) 2 ],2.95[m,(CH 2 )],4.02[m,(CH 2 ) 2 ].

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Abstract

A use of an amino group-containing neutral phosphine extraction agent having the following formula I for the extraction and separation of tetravalent cerium, and a method using the amino group-containing neutral phosphine extraction agent having formula I to extract and separate tetravalent cerium. R1 and R2 are each independently selected from C1-C12 alkyl groups, R3 and R4 are each independently selected from C1-16 alkyl groups and hydrogen, and n is an integer from 1 to 8.

Description

technical field [0001] The present invention relates to the extraction and separation method of tetravalent cerium, in particular, relates to the application of a class of amino-containing neutral phosphine extractant in the separation of tetravalent cerium, and the extraction and separation of tetravalent cerium by using the amino-containing neutral phosphorus extractant method. Background technique [0002] Solvent extraction separation method, due to its advantages of large processing capacity, fast reaction speed and good separation effect, has become the main method for rare earth separation and extraction in China, and is also one of the main methods for preparing high-purity single rare earth. [0003] Currently commonly used extractants for rare earth separation such as tributyl phosphate (TBP), di(2-ethylhexyl) phosphoric acid (D2EHPA, P204), 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (HEH (EHP) , P507), bis(2,4,4-trimethylpentyl)phosphonic acid (Cyanex 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C22B59/00
CPCC22B59/00Y02P10/20
Inventor 廖伍平卢有彩张志峰李艳玲吴国龙
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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