Extraction method based on magnetic janus particles

An extraction and particle technology, applied in the field of extraction, can solve problems such as the application of magnetic Janus particles that have not been paid attention to, and achieve the effects of increasing the contact area of ​​the two phases, increasing the mass transfer rate, and strong flexibility

Active Publication Date: 2021-11-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Patent Document 1 does not pay attention to the application of the magnetic Janus particles in the field of liquid-liquid extraction

Method used

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  • Extraction method based on magnetic janus particles
  • Extraction method based on magnetic janus particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] In 200ml of an aqueous solution of a neodymium compound with a concentration of 100ppm in terms of neodymium, add 4ml of a kerosene solution of 1mol / L monoisooctyl phosphate (P507) and 0.4g (relative to the aqueous solution of neodymium compound and P507 The total amount of kerosene solution, 0.2wt.%) magnetic Janus particles (such as figure 1 The magnetic silica / polystyrene-divinylbenzene Janus particles shown in ) were placed in a shaker at a constant temperature of 25°C and a rotational speed of 130r / min for 20min. After shaking, use a 0.3T magnet to enrich and remove the enriched emulsion part stabilized by the magnetic Janus particles in the system, and the system obtained after separating the enriched emulsion part is allowed to stand for 15 minutes to separate the layers, and then separate the liquid. The residual amount of the neodymium compound in the aqueous phase after the intensive extraction with the magnetic Janus material was 18 ppm in terms of neodymium...

Embodiment 2

[0096] Add 5ml carbon tetrachloride and 0.2g (relative to the total amount of iodine aqueous solution and carbon tetrachloride, 0.2wt.%) magnetic Janus particles (such as figure 1 Magnetic silica / polystyrene-divinylbenzene Janus particles shown in ), placed in a shaker at a constant temperature of 25°C and a rotational speed of 130r / min for 10min. After shaking, use a 0.3T magnet to enrich and remove the enriched emulsion part stabilized by the magnetic Janus particles in the system, and the system obtained after separating the enriched emulsion part is allowed to stand for 15 minutes to separate the layers, and then separate the liquid. The residual amount of iodine in the water phase after the enhanced extraction with the magnetic Janus material is 16 ppm, and the extraction rate of iodine is 84%.

[0097] To the separated enriched emulsion part, an external magnetic field was applied with a 3T magnet, so that the enriched emulsion part was demulsified. Afterwards, a 3T ma...

Embodiment 3

[0099] In 5ml of the kerosene solution of benzoic acid with a volume content of 40%, add 100ml of water and 0.2g (relative to the total amount of the aqueous solution of benzoic acid and water, 0.2wt.%) magnetic Janus particles (such as figure 1 Magnetic silica / polystyrene-divinylbenzene Janus particles shown in ), placed in a shaker at a constant temperature of 25°C and a rotational speed of 130r / min for 10min. After shaking, use a 0.3T magnet to enrich and remove the enriched emulsion part stabilized by the magnetic Janus particles in the system, and the system obtained after separating the enriched emulsion part is allowed to stand for 15 minutes to separate the layers, and then separate the liquid. The residual amount of benzoic acid in the benzoic acid kerosene solution after enhanced extraction by using the magnetic Janus material is 9 ppm, and the extraction rate of benzoic acid is 91%.

[0100] To the separated enriched emulsion part, an external magnetic field was ap...

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Abstract

The invention relates to an extraction method based on magnetic Janus particles. The extraction method of the present invention comprises the following steps: a) in the liquid to be extracted, the composition for extraction and the magnetic Janus particles are put into, and at least a part of the obtained extraction system is formed into an emulsion under dynamic conditions, wherein the composition for extraction is At least a part is formed as a dispersed phase stabilized by the magnetic Janus particles, wherein each of the magnetic Janus particles has both a hydrophilic portion and a hydrophobic portion; b) applying an external magnetic field A to form a dispersed phase enriched with the dispersed phase Enriching the emulsion part, and further separating the enriched emulsion part; c) making the extraction system obtained after separating the enriched emulsion part into layers, and further separating.

Description

technical field [0001] The present invention relates to extraction methods, in particular to methods for enhancing liquid-liquid extraction by using magnetic Janus particles as solid particle emulsifiers. Background technique [0002] Liquid-liquid extraction is widely used in petroleum industry (petroleum exploration, petroleum refining and petrochemical industry, etc.), metallurgical industry, machinery industry, textile industry, cosmetics manufacturing industry, catering industry or food industry or in the field of water body protection. Applied to the separation of target substances from liquid compositions, liquid-liquid extraction uses the different solubility of target substances in different solvents to separate mixtures. In traditional liquid-liquid extraction, the dispersion size of the liquid-liquid two-phase is relatively large, so the contact area between the two phases is small, resulting in low mass transfer rate, which requires a long residence time to reach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04C07C51/47C07C63/06
CPCB01D11/0419B01D11/0423B01D11/0492C07C51/47C07C63/06
Inventor 杨振忠梁福鑫徐建鸿
Owner TSINGHUA UNIV
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