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Liquid membrane extraction method by taking hollow fiber composite membrane as liquid membrane carrier

A technology of fiber composite and composite membrane, which is applied in liquid solution solvent extraction, chemical instruments and methods, membrane technology, etc., can solve the problem of hindering mass transfer coefficient and mass transfer flux, extracting phase separation, serious stratification, extraction The problem of small phase adsorption can be achieved to increase the effect area, increase the amount of adhesion, and improve the stability

Active Publication Date: 2015-01-07
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the feed-liquid phase and the extract phase need to be stirred and mixed first, and then pumped into the membrane device. The mixture of the feed-liquid phase and the extract phase is at a low flow rate, and the extract phase is separated in the feed-liquid phase. Severe stratification, it is difficult for the extract phase to exist as droplets in the feed liquid phase, so that the probability of the extract phase being adsorbed to the surface of the fiber membrane is very small, and there is still the problem of liquid film loss during operation
Moreover, in the existing supported liquid film and updated liquid film technologies, the extraction phase is naturally adsorbed in the pores of the support by means of surface tension and capillary force, which does not guarantee that all pores of the support are filled with the extraction phase. , hindering the improvement of mass transfer coefficient and mass transfer flux

Method used

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  • Liquid membrane extraction method by taking hollow fiber composite membrane as liquid membrane carrier
  • Liquid membrane extraction method by taking hollow fiber composite membrane as liquid membrane carrier
  • Liquid membrane extraction method by taking hollow fiber composite membrane as liquid membrane carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Hollow fiber composite membrane membrane module 1 and mixer 6 are self-made, such as figure 1 , figure 2 As shown, it is realized by a tubular hollow-dimensional composite membrane module 1 and a tubular mixer 6;

[0035]The hollow-dimensional composite membrane module 1 includes a glass tube body and a hollow fiber composite membrane packaged in the glass tube body; the hollow fiber composite membrane includes a polymer film layer and a braided tube support layer, which is uniformly coated on the surface of the braided tube support layer prepared from polymer-coated materials. The hollow channel of the hollow fiber composite membrane is the tube side, and the cavity between the outer surface of the hollow fiber composite membrane and the glass tube is the shell side; the two ends of the hollow fiber composite membrane module 1 are respectively provided with a tube side inlet 2 and a tube side outlet 3; The side wall of the glass tube is respectively provided with a ...

Embodiment 2

[0041] Adopt 4# film in table 1, change the flow velocity of the tube side in embodiment 1 to 0.7m / min, the flow rate is 2.8ml / min, the shell side flow velocity is 1.0m / min, the flow rate is 10.1ml / min, other conditions unchanged, the measured Cu at the inlet of the tube 2+ ConcentrationX f in =2200ppm, tube outlet Cu 2+ ConcentrationX f out =1927ppm, shell inlet Cu 2+ ConcentrationX s in =0ppm, Cu at shell side outlet 2+ ConcentrationX s out =268ppm, the total mass transfer coefficient K is calculated under this operating condition f =0.96×10 -5 m / s.

Embodiment 3

[0043] Hollow fiber composite membrane module 1 and mixer 6 are self-made, using 2# membrane, and the structural parameters are shown in Table 1.

[0044] Test system with Na 2 HASO 4 .7H 2 O aqueous solution is the feed liquid phase, trioctylmethylammonium chloride (Aliquat-336) / aviation kerosene=2:8 is the extraction phase, and NaCl aqueous solution is the back extraction phase. Seal the outlet 3 of the tube side of the hollow fiber composite membrane module 1, and use a peristaltic pump to inject the extract phase from the inlet 2 of the tube side of the hollow fiber composite membrane module 1, so that the extract phase flows from the hollow fiber under the pressure of the peristaltic pump. The inside of the hollow fiber composite membrane in the composite membrane membrane module 1 penetrates to the outer surface of the hollow fiber composite membrane, and then the hollow fiber composite membrane module 1 is soaked in the extraction phase for 12 hours, so that the polym...

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Abstract

The invention discloses a liquid membrane extraction method by taking a hollow fiber composite membrane as a liquid membrane carrier. According to the liquid membrane technology, the hollow fiber composite membrane serves as the liquid membrane carrier, an extract phase is filled and attached to the gap and surface of the hollow fiber composite membrane to form the liquid membrane, a feed liquid phase solution and a reverse extraction phase respectively flow through two sides of the carrier, and the separation effect of in-step extraction and reverse extraction is realized through the liquid membrane function. The hollow fiber composite membrane consists of a braided tube layer and a polymer membrane layer; and meanwhile, the extraction phase and the feed liquid phase are fully mixed before entering the membrane by utilizing a mixer, the dispersing effect of the extraction phase liquid drops in the feed liquid phase is improved, the contact probability of the liquid membrane and the feed liquid solution is enhanced, and the mass transfer efficiency is improved. The imbalanced extraction realized by the liquid membrane technology is utilized, the problems that the liquid membrane attachment amount is small, the liquid membrane is instable, the mass transfer efficiency is low and the like in the hollow fiber supported liquid membrane and the liquid membrane updating technology are solved, the mass transfer coefficient and liquid membrane flux are improved, and the magnitude order of the mass transfer coefficient is 10-5.

Description

technical field [0001] The invention belongs to the field of liquid membrane technology, in particular to a liquid membrane extraction method using a hollow fiber composite membrane as a liquid membrane carrier. Background technique [0002] Extraction technology is a commonly used separation technology. At present, in the conventional industrial extraction and separation process, extraction and stripping need to be carried out separately in two different equipments, which has high requirements on the operation of the process, and due to the influence of mass transfer balance , the volume of separation equipment required is generally large. Therefore, many researchers at home and abroad have proposed the liquid membrane extraction and separation technology of the same level extraction and back extraction. Liquid membrane, hollow fiber sealed liquid membrane, hollow fiber updated liquid membrane, etc. [0003] Liquid membrane technology is an extraction and separation proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04B01D61/38
Inventor 王磊孙兵容志勇李贵军张颖吴子平苗瑞柴续斌吕永涛周刚王旭东黄游孟晓荣黄臣勇
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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