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Method for determination of complex extraction equilibrium constant of double extraction agent organic phase system

A technology of equilibrium constant and extractant, which is applied in the field of determination of complex extraction equilibrium constant in double extractant organic phase system, can solve the problems of cumbersome steps and difficult calculation, and achieve simple, simplified measurement process and simplified steps Effect

Active Publication Date: 2016-02-24
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0040] The steps of the method for determining the extraction equilibrium constant are cumbersome and difficult to calculate.

Method used

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  • Method for determination of complex extraction equilibrium constant of double extraction agent organic phase system
  • Method for determination of complex extraction equilibrium constant of double extraction agent organic phase system
  • Method for determination of complex extraction equilibrium constant of double extraction agent organic phase system

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Embodiment 1

[0066] Using this method to determine the extraction equilibrium constant of uranyl ions extracted from nitric acid solution by the organic phase containing TBP-DBP, the extraction complex is composed of UO 2 (NO 3 ) 2 · TBP · DBP. Firstly, it is known that the organic phase containing TBP extracts uranyl ions from nitric acid solution to form an extraction complex composed of UO 2 (NO 3 ) 2 2TBP, and can calculate or look up the table to get its extraction equilibrium constant K U(VI)-TBP =10 2.36 , its 346-500nm absorption spectrum is shown in figure 1 shown.

[0067] Determination of UO 2 (NO 3 ) 2 The steps of the extraction equilibrium constant of TBP·DBP are:

[0068] Prepare 10% TBP-xylene organic phase solution, extract uranyl nitrate from 1mol / L nitric acid solution, and the concentration of uranium in the equilibrium organic phase is 3.25×10 -2 mol / L. Take out 2.5ml of the organic phase, add 10% DBP-xylene solution to it one by one, and shake and mix, th...

Embodiment 2

[0071] This method is used to measure the extraction equilibrium constant of U(IV) ion extracted from nitric acid solution by TBP-DBP organic phase, and its extraction complex is composed of U(NO 3 ) 4 · TBP · DBP. It is known that the organic phase containing TBP extracts uranium (IV) ions from nitric acid solution to form an extraction complex composed of U(NO 3 ) 4 2TBP, its extraction equilibrium constant K U(IV)-TBP =10 3.56 , its 450-700nm absorption spectrum is shown in image 3 shown.

[0072] Determination of U(NO 3 ) 4 The steps of TBP·DBP extraction equilibrium constant are:

[0073] Prepare 10% TBP-xylene organic phase solution, extract uranium (IV) nitrate from 1mol / L nitric acid solution, and the concentration of uranium in the equilibrium organic phase is 1.61×10 -2 mol / L, the ratio of U(IV) is greater than 99.2%. Take out 2.5ml of organic phase, add 10% DBP-xylene solution to it one by one, shake and mix, the order and frequency of addition are 25ul×4...

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Abstract

The present invention belongs to the technical field of solvent extraction, and discloses a method for determination of complex extraction equilibrium constant of a double extraction agent organic phase system. According to the method, mixed extraction complex extraction equilibrium constant of the double extraction agent organic phase system can be calculated by use of known single extraction complex extraction equilibrium constant and reaction equilibrium constant of conversion of a single extraction complex into a complex extraction matter, and the method has the features of being simple in steps and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of solvent extraction, and in particular relates to a method for measuring the extraction equilibrium constant of a complex in a double extractant organic phase system. Background technique [0002] In the process of solvent extraction, when the organic phase contains a variety of extractants and can form a variety of extraction complexes with metals, it is often complicated to determine the extraction equilibrium constant of a certain complex. The traditional measurement method is the solvent extraction method, which is based on the extraction reaction equation of each extraction complex to obtain their respective extraction equilibrium constant expressions, and express the distribution ratio as a form related to the extraction equilibrium constant and the concentration of each substance in the system , by changing the concentration of a certain component in the formula, while fixing the concentration of ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 石四维左臣郑卫芳晏太红
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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