Extraction method based on magnetic Janus particles

An extraction and magnetic 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 effect of high-efficiency liquid separation and strong flexibility

Active Publication Date: 2020-09-11
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Extraction method based on magnetic Janus particles
  • Extraction method based on magnetic Janus particles

Examples

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Example Embodiment

[0092] Example 1

[0093] In 200ml of an aqueous solution of a neodymium compound with a concentration of 100ppm converted to neodymium, 4ml of a kerosene solution of isooctyl monoisooctyl phosphate (P507) with a concentration of 1mol / L 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 rotation speed of 130 r / min for 20 min. After the shaking, the 0.3T magnet was used to concentrate and remove the concentrated emulsion part stabilized by the magnetic Janus particles in the system, and the system obtained after separating the concentrated emulsion part was allowed to stand for 15 minutes for layering and then liquid separation. The residual amount of the neodymium compound in the water phase after the magnetic Janus material was...

Example Embodiment

[0095] Example 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 The magnetic silica / polystyrene-divinylbenzene Janus particles shown in) were placed in a shaker at a constant temperature of 25° C. and a rotation speed of 130 r / min for 10 min. After the shaking, the 0.3T magnet was used to concentrate and remove the concentrated emulsion part stabilized by the magnetic Janus particles in the system, and the system obtained after separating the concentrated emulsion part was allowed to stand for 15 minutes for layering and then liquid separation. The residual amount of iodine in the aqueous phase after the enhanced extraction with the magnetic Janus material was 16 ppm, and the extraction rate of iodine was 84%.

[0097] To the separated enriched emulsion part, an external magnetic field was applied with a 3T magnet to break the enriched emulsion pa...

Example Embodiment

[0098] Example 3

[0099] In 5ml kerosene solution of benzoic acid with a volume content of 40%, add 100ml water and 0.2g (relative to the total amount of benzoic acid aqueous solution and water, 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 rotation speed of 130 r / min for 10 min. After the shaking, the 0.3T magnet was used to concentrate and remove the concentrated emulsion part stabilized by the magnetic Janus particles in the system, and the system obtained after separating the concentrated emulsion part was allowed to stand for 15 minutes for layering and then liquid separation. The residual amount of benzoic acid in the benzoic acid kerosene solution after enhanced extraction with the magnetic Janus material was 9 ppm, and the extraction rate of benzoic acid was 91%.

[0100] To the separated enriched emulsion part, an external magn...

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Abstract

The invention relates to an extraction method based on magnetic Janus particles. The extraction method comprises the following steps: a) adding an extraction composition and magnetic Janus particles into a to-be-extracted solution, and forming at least one part of an obtained extraction system into an emulsion under dynamic conditions, wherein at least a portion of the composition for extraction is formed as a dispersed phase stabilized by the magnetic Janus particles, wherein each of the magnetic Janus particles has a hydrophilic portion and a hydrophobic portion at the same time; b) applyingan external magnetic field A to form an enriched emulsion part enriched with the dispersed phase so as to separate the enriched emulsion part, and c) layering and separating an extraction system obtained after the enriched emulsion part is separated.

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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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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