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Use and method of neutral phosphine extractant for extracting and separating cerium (iv) or thorium (iv)

An extractant and neutral phosphine technology, which is applied in the field of extraction and separation of tetravalent cerium (quaternary cerium) or tetravalent thorium), can solve the problems of high extraction and separation costs, low economic benefits, and difficult synthesis, so as to reduce extraction and separation costs and cost The effect of low cost and simple synthesis method

Active Publication Date: 2018-08-03
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

However, these extractants also have different disadvantages. In industry, Cyanex923, which has better extraction and separation ability for cerium (IV), requires a certain amount of cerium (IV) in the feed liquid when separating thorium (IV) step by step. , and its high price and difficult synthesis lead to high extraction and separation costs and low economic benefits

Method used

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  • Use and method of neutral phosphine extractant for extracting and separating cerium (iv) or thorium (iv)
  • Use and method of neutral phosphine extractant for extracting and separating cerium (iv) or thorium (iv)
  • Use and method of neutral phosphine extractant for extracting and separating cerium (iv) or thorium (iv)

Examples

Experimental program
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Effect test

Embodiment

[0104] 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.

[0105] Preparation Example

[0106] Reagents and sources

[0107] Bis(2-ethylhexyl) phosphite, diethyl phosphite, aviation kerosene and TBP were purchased from Shanghai Laiyashi Chemical Co., Ltd.

[0108] Metaldehyde, propionaldehyde, acetone, di-n-hexylamine, diisobutylamine, n-butylamine, diisooctylamine, dodecylamine, isooctylamine, dimethylamine, toluene, xylene, p-methyl Benzenesulfonic acid and heptane were purchased from Aladdin Reagent Co., Ltd.

[0109] Cyanex 923 and 2-methylheptanol were purchased from Shanghai Cyanex Chemical Co., Ltd.

[0110] Feed liquid, washing liquid and stripping agent are self-made in the laboratory.

[0111] Other reagents (such as acids, etc.) are commercially av...

preparation example 1

[0114] Preparation Example 1: Preparation of 1-(2-ethylhexylamino)-1-methylethylphosphonic acid bis(2-ethylhexyl)ester

[0115]

[0116] In a single-necked flask equipped with a mechanical stirrer and a condensing reflux device, add bis(2-ethylhexyl) phosphite (1mol), acetone (1.1mol), isooctylamine (1.1mol), toluene (800ml) and P-toluenesulfonic acid (0.8g), stirred and refluxed, reacted at 80-90°C for 12h. Toluene and unreacted raw materials were removed by rotary evaporation to obtain the target product.

[0117] 1 H NMR (600MHz, CDCl 3 , ppm): δ0.84-1.54[m, (CH 3) 8 ,(CH 2 ) 12 ,(CH) 3 ],2.59[d,(CH 2 )],3.98[m,(CH 2 ) 2 ].

preparation example 2

[0118] Preparation Example 2: Preparation of 1-(N,N-diisobutylamino)-1-methylethylphosphonic acid bis(2-ethylhexyl)ester

[0119]

[0120] Except that diisobutylamine was used instead of isooctylamine, the target product was prepared by the same process as in Preparation Example 1.

[0121] 1 H NMR (400MHz, CDCl 3 ,ppm): δ0.89-1.71[m,(CH 3 ) 10 ,(CH 2 ) 8 ,(CH) 2 ],2.06[m,(CH) 2 ],2.32[m,(CH 2 ) 2 ],4.12[m,(CH 2 ) 2 ].

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Abstract

The present invention relates to the use and method of an amino-containing neutral phosphine extractant of the following general formula I for extracting and separating Ce(IV) or Th(IV): wherein, R1 and R2 are each independently selected from C1~C12 alkyl groups; R3 and R4 are each independently selected from C1-C5 alkyl and hydrogen, and at most one of R3 and R4 is hydrogen; R5 and R6 are each independently selected from C1-C16 alkyl and hydrogen, and at most one of R5 and R6 is hydrogen.

Description

technical field [0001] The present invention relates to the extraction and separation method of tetravalent cerium (Ce(IV)) or tetravalent thorium (Th(IV)), in particular, relates to a class of amino-containing neutral phosphine extractant for extracting and separating Ce(IV) or Use of Th(IV) and a method for extracting and separating Ce(IV) or Th(IV) using the amino-containing neutral phosphine extractant. Background technique [0002] The traditional separation and recovery methods of rare earths include fractional crystallization, precipitation and ion exchange, but their disadvantages such as low separation efficiency, large consumption of reagents, high cost, complicated operation and long separation cycle limit their industrial application. Scale application. The solvent extraction separation method has become the main method of rare earth separation and extraction in China due to its advantages of large processing capacity, fast reaction speed and good separation eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C22B59/00
CPCC22B59/00C22B3/384C22B3/408Y02P10/20
Inventor 廖伍平邝圣庭薛天宇张志峰李艳玲吴国龙
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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