Method for separating Rb<+> and Na<+> based on ionic liquid polymer liquid membrane

A technology of ionic liquid and separation method, which is applied in the field of separation of precious metal rubidium and sodium ions, and achieves the effects of simple operation, mild process conditions and easy process amplification

Active Publication Date: 2020-02-14
陕西省膜分离技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymer membrane separation technology using crown ether as crown ether has been used to treat Cs + 、Ag + , Pb 2+ In the separation research of plasma, but has not yet been developed in the selective separation of rubidium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: After mixing 2.8% PVC, 93.9% tetrahydrofuran, 0.50% crown ether DC18C6 and 2.8% ionic liquid methyl trioctyl ammonium chloride, stir at room temperature until completely dissolved, pour into glass for cultivation Keep the liquid surface thickness between 1.0 and 2.0mm in the dish, cover it with plastic wrap and cover it, place it horizontally, and volatilize at 30°C until it becomes a transparent film. Soak it in a small amount of water, take it out, measure it with a spiral micrometer with an accuracy of 0.01 mm, select a film with a thickness of 150-200 μm, fix it with a gasket and screws and install it in a hollow splint where the two liquid pools are glued together with a sealant. Ensure that the materials in the liquid pools on both sides can only pass through the membrane for mass transfer. The effective mass transfer area of ​​the membrane is 3.14cm 2 . Inject 100 mL of an aqueous solution containing 30 mg / L of rubidium nitrate and 30 mg / L of sodium ...

Embodiment 2

[0040] Embodiment 2: Compared with Embodiment 1 in this embodiment, the composition of the rubidium ionic liquid polymer liquid film is different.

[0041] After mixing 2.70% of PVC, 53.96% of tetrahydrofuran and 40.8% of N,N-dimethylformamide, 0.44% of crown ether DC18C6 and 2.1% of ionic liquid methyl trioctyl ammonium chloride, at room temperature Stir until completely dissolved, pour into a glass petri dish and keep the liquid level between 1.0 and 2.0 mm, cover it with plastic wrap and cover it, place it horizontally, and volatilize at 30°C until it becomes a translucent film. On the same membrane extraction device as in Example 1 and with the same effective mass transfer area of ​​the membrane, and under the exact same feed liquid and analysis conditions such as volume and concentration, the platinum electrode in the feed liquid pool is connected to the positive pole of the power supply, and in the analysis pool The platinum electrode is connected to the negative pole of...

Embodiment 3

[0042] Embodiment 3: Compared with Embodiment 1 in this embodiment, the composition of the rubidium ionic liquid polymer liquid film is different.

[0043] After mixing 2.3% of polyvinylidene fluoride, 39.15% of tetrahydrofuran and 55.85% of N,N-dimethylacetamide, 0.38% of crown ether DC18C6 and 2.32% of trioctylmethylammonium chloride, the Stir at room temperature until completely dissolved, pour into a glass petri dish and keep the liquid level between 1.0 and 2.0 mm, cover it with plastic wrap and cover it, place it horizontally, and volatilize at 30°C until it becomes a translucent film. On the same membrane extraction device as in Example 1 and with the same effective mass transfer area of ​​the membrane, and under the exact same feed liquid and analysis conditions such as volume and concentration, the platinum electrode in the feed liquid pool is connected to the positive pole of the power supply, and in the analysis pool The platinum electrode is connected to the negati...

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Abstract

The invention discloses a method for separating Rb<+> and Na<+> based on an ionic liquid polymer liquid membrane. The ionic liquid polymer liquid membrane is formed by blending and dissolving of an ionic liquid, crown ether and a base polymer in an organic solvent to form a homogeneous solution, and volatile phase converting and curing. According to the method for separating Rb<+> and Na<+> basedon an ionic liquid polymer liquid membrane, an ionic liquid polymer liquid membrane permeation device is coupled with an external electric field, and rubidium or sodium ions in a feed liquid phase containing rubidium and sodium ions are selectively transferred into an analytic phase at different rates through electric field strengthening, so that the separation of Rb<+> and Na<+> is realized. Theionic liquid polymer liquid membrane is low extraction agent using amount, simple and convenient in preparation process and low in cost; the ionic liquid polymer liquid membrane is adopted in membraneextraction separation technology of Rb<+> and Na<+>, extraction and reverse extraction are synchronous, the selectivity of Rb<+>/Na<+> is high, the energy consumption in the mass transfer process islow, and secondary pollution is avoided. The method is suitable for extracting and separating precious metal rubidium under the high-sodium background.

Description

technical field [0001] The invention belongs to the technical field of precious metal wet smelting and chemical separation, and relates to a membrane product with a selective separation effect on precious metal rubidium and a separation method for precious metal rubidium and sodium ions. Background technique [0002] Alkali metal rubidium is widely used in the fields of new energy, aerospace technology and national defense industry. my country is rich in rubidium resources, most of which (nearly 10 million tons) are distributed in liquid resources such as seawater and brine at extremely low concentrations (<100mg / L), and only a very small amount exists in lepidolite, cesium lithium, etc. In ore resources such as mica. Fractional crystallization method and precipitation method can only be mineralized and extracted rubidium after the rubidium concentration reaches 1g / L. Adsorption, extraction, ion exchange and other methods are suitable for the extraction and separation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/42B01D61/44B01D71/76B01D67/00C22B26/10
CPCB01D61/427B01D61/44B01D69/125B01D71/76C22B26/10
Inventor 王磊孟晓荣
Owner 陕西省膜分离技术研究院有限公司
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