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A two-phase membrane extraction method and device

A two-phase, extraction technology, applied in separation methods, counter-current extraction, co-current extraction, etc., can solve the problems of difficult recovery and recycling of phase-formed substances, uncertain selectivity of target metal separation, and high cost of waste treatment. Achieve the effects of easy recycling, small footprint and stable operation

Active Publication Date: 2018-12-21
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the extraction process, they are used in a large amount. At present, the phase-forming substances are difficult to recover and recycle, resulting in problems such as large material consumption, high waste treatment costs, and high extraction process costs.
Moreover, the addition of phase-forming salts simultaneously introduces anions and cations, which are often combined with metal ions, resulting in complex systems and uncertain selectivity for target metal separation.

Method used

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  • A two-phase membrane extraction method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A solution containing chromium: the concentration of Cr(VI) is 5mmol / L, and the pH value of the solution is 6.

[0033] The flat membrane module is prepared by using the polytetrafluoroethylene flat membrane with ion transfer function, the module parameters are 60cm×40cm, the number of membrane modules is 10, and the total effective area of ​​the module membrane is 2.7m 2 .

[0034] Polyethylene glycol with a molecular weight of 20,000 was used as the extractant, and a 75 g / L polyethylene glycol solution was configured as the polymer phase.

[0035] The chromium-containing feed liquid enters the membrane module, and the feed liquid phase and the polymer phase between the membrane modules flow in reverse on both sides of the membrane, that is, the polymer phase extracted through the membrane of this stage enters the membrane module of the next stage, and passes through the membrane of this stage. The liquid phase of the membrane extraction enters the previous membrane m...

Embodiment 2

[0038] A solution containing chromium: the concentration of Cr(VI) is 1mmol / L, and the pH value of the solution is 3.

[0039]A flat membrane module is prepared by using a polytetrafluoroethylene flat membrane with ion transfer function, the module parameters are 60cm×40cm, the number of membrane modules is 15, and the total effective area of ​​the module membrane is 4m 2 .

[0040] The polyoxyethylene-polyoxypropylene copolymer with an average molecular weight of 10,000 (wherein the polyethylene oxide block accounts for 40% of the mass fraction of the copolymer) is used as the extraction agent, and a 10 g / L copolymer solution is configured as the polymer phase .

[0041] The chromium-containing feed liquid enters the membrane module, and the feed liquid phase and the polymer phase between the membrane modules flow in reverse on both sides of the membrane, that is, the polymer phase extracted through the membrane of this stage enters the membrane module of the next stage, and...

Embodiment 3

[0044] A solution containing iron: the concentration of Fe(II) is 3mmol / L, and the pH value of the solution is 3.

[0045] The polysulfone ultrafiltration membrane with ion transfer function is used to prepare a flat membrane module, the module parameters are 60cm×40cm, the number of membrane modules is 10, and the total effective area of ​​the module membrane is 2.7m 2 .

[0046] The polysulfone ultrafiltration membrane used in this example is a self-prepared membrane. The preparation method is: dissolve 18% polysulfone in N,N-dimethylformamide solvent, let it stand for 3 days after completely dissolving, and use After defoaming in a vacuum oven for 15 minutes, use a flat film scraping machine to continuously scrape a polymer solution with a thickness of 250 μm on the non-woven fabric, and immediately immerse it in a water bath at 20°C to form a film.

[0047] The polyethylene glycol with an average molecular weight of 100,000 is used as the extraction agent, and o-phenanthr...

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Abstract

The invention discloses a two-aqueous-phase membrane extraction method and device and belongs to the technical field of extraction and separation. Two-aqueous-phase extraction and membrane separation are organically combined, and the liquid phase and the extract phase of the two aqueous phases flow on the two sides of a membrane respectively; the liquid phase is an aqueous solution which contains target metal ions; the extract phase is a polymer phase or a polymer loaded with a coordination agent; the target ions enter the polymer phase through membrane holes. Through the two-aqueous-phase membrane extraction method and device, addition of inorganic salt and subsequent salt recovery are eliminated, the problem that the two aqueous phases are prone to emulsification is solved, it is avoided that loss is caused by mixing and dissolving of the polymer phase and the liquid phase, and the method is a simple, efficient and environment-friendly process method with low energy consumption and has the advantages that the occupied area is small, running is stable, and large-scale production is easy.

Description

technical field [0001] The invention belongs to the technical field of extraction and separation, and in particular relates to a two-phase membrane extraction method and device. Background technique [0002] In recent years, a new type of extraction system—polymer-based aqueous two-phase extraction has received great attention and attention. When a certain concentration of a polymer aqueous solution and an inorganic salt solution are mixed in a certain volume ratio, they can naturally separate phases and form a mutually incompatible two-phase system. After the target substance enters the two-phase aqueous system, the concentration of the target substance in the upper and lower phases is different due to the van der Waals force between molecules, hydrophobic interaction, hydrogen bond between molecules, and the charge between molecules, so as to achieve extraction. purpose of separation. Compared with traditional extraction techniques, aqueous two-phase extraction has the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04
CPCB01D11/0415B01D11/043B01D2011/002B01D2011/005
Inventor 谢铿王海北刘三平
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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