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Method for extracting and separating ions in two valence states of the same element in three phases

A technology of elements and valence states, applied in the direction of liquid solution solvent extraction, etc., to achieve the effects of eliminating interference, avoiding spectral overlap, and being easy to recycle and process

Inactive Publication Date: 2011-09-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Liquid-liquid-liquid three-phase extraction separation of the same element with different valence states has not been reported

Method used

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  • Method for extracting and separating ions in two valence states of the same element in three phases
  • Method for extracting and separating ions in two valence states of the same element in three phases
  • Method for extracting and separating ions in two valence states of the same element in three phases

Examples

Experimental program
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Effect test

Embodiment 1

[0029]1.5 g of polyethylene glycol with a molecular weight of 2000 and 5 g of ammonium sulfate were dissolved in a solution containing 100 μmol of Cr(III) and Cr(VI), adjusted to pH=6 with sulfuric acid and sodium hydroxide, and adjusted to a volume of 20 mL, Then add 3.3 mL of 30% (v / v) bis(2-ethylhexyl) phosphate / n-hexane mixed organic solvent, the volume ratio of organic solvent and aqueous solution is 1:6, after shaking for 5 min, centrifuge at 3000 rpm for 10 min , forming a liquid-liquid-liquid three-phase system. The extraction rate of Cr(VI) in the polyethylene glycol middle phase reached 80.2%, and the extraction rate of Cr(III) in the upper phase reached 91.5%.

Embodiment 2

[0031] 5.5g molecular weight is 1500 polyoxyethylene-polyoxypropylene copolymers (wherein the polyethylene oxide block accounts for the mass fraction of copolymer is 40%) and 2g sodium sulfate dissolves in containing 150 μ mol Cr (III) and 100 μ mol Cr (VI ) solution, adjust the pH=3 with sulfuric acid and ammonia water, and set the volume to 20mL, then add 16mL of 30% (v / v) di(2-ethylhexyl) phosphate / kerosene mixed organic solvent, organic solvent and The volume ratio of the aqueous solution was 1:1.25. After shaking for 15 minutes, it was centrifuged at 3000 rpm for 8 minutes. At this time, a liquid-liquid-liquid three-phase system was formed. The extraction rate of Cr(VI) in the middle phase reaches 99.3%, and the extraction rate of Cr(III) in the upper phase reaches 60.6%.

Embodiment 3

[0033] 1.5g of polyethylene glycol with a molecular weight of 2000 and 5g of ammonium sulfate are dissolved in a solution containing 50 μmol of Fe(III) and Fe(II), and 150 μmol of o-phenanthroline is added, wherein the mole of o-phenanthroline and Fe(II) The ratio is 3:1, adjust pH=6 with sulfuric acid, and set the volume to 20mL, then add 8mL of 60% (v / v) trialkylphosphine oxide / n-dodecane mixed organic solvent, organic solvent and aqueous solution The volume ratio is 1:2.5. After shaking for 30 minutes, centrifuge at 3000 rpm for 10 minutes. At this time, a liquid-liquid-liquid three-phase system is formed. The extraction rate of Fe(II) in the polyethylene glycol middle phase reaches 99.5%, and the extraction rate of Fe(III) in the upper phase reaches 75.7%.

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Abstract

The invention relates to the technical field of extraction and separation, in particular to a method for extracting and separating ions in two valence states of the same element in three phases. The method comprises the following steps of: 1) adding water-soluble high polymer, inorganic strong polyelectrolyte salt and a coordinating agent in turn into aqueous solution containing the ions in two valence states of the same element, and fully mixing to obtain mixed solution; and 2) regulating the pH of the mixed solution in the step 1), adding an organic extracting agent immiscible with water, fully mixing, standing and centrifuging to obtain a liquid-liquid-liquid three-phase system with coexistent upper layer, middle layer and lower layer, wherein the upper layer is an organic phase, the middle layer is an aqueous phase of the high polymer and the lower layer is an aqueous phase of the inorganic strong polyelectrolyte salt, and the ions in the two valence states are respectively extracted into the upper, middle or lower layer to realize the extraction and separation of the ions in the two valence states of the same element. By the method, the same element in two valence states is finely separated, and the problem of low recovery rate in a liquid-liquid extraction process is solved.

Description

technical field [0001] The invention relates to the technical field of extraction and separation, in particular, the invention relates to a method for three-phase extraction and separation of two valence ions of the same element. Background technique [0002] In the natural environment, an element often has two main valence states. Elements in the two valence states have completely different chemical and toxicological behaviors. For example: Chromium (III) is a trace element necessary to maintain the normal metabolism of the human body. Its complex with B2 globulin is indispensable to maintain normal metabolism. Chromium deficiency can cause various diseases such as atherosclerosis. On the contrary, chromium (VI) has strong toxicity. Its intake can affect the redox of cells, can combine with nucleic acid, stimulate the digestive tract and respiratory tract, have carcinogenic and mutagenic effects, and cause serious harm to human health. Antimony (III) has a high affinity w...

Claims

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Application Information

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IPC IPC(8): B01D11/04
Inventor 刘会洲谢铿黄焜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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