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Oil-water separation method based on magnetic Janus particles

A kind of oil-water separation and magnetic technology, which is applied in the direction of separation method, immiscible liquid separation, liquid separation, etc., can solve the problems of oil-water separation technology research, oil-water separation effect is difficult to achieve the ideal effect, etc., to simplify industrial equipment and reduce industrial The effect of cost and simple operation

Active Publication Date: 2020-09-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the oil-water separation effect in this patent document 2 is still difficult to achieve the ideal effect, and no in-depth research has been carried out on the oil-water separation technology
[0008] It can be seen that there is still room for improvement to establish a technology that can easily and efficiently separate oil from water

Method used

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  • Oil-water separation method based on magnetic Janus particles
  • Oil-water separation method based on magnetic Janus particles
  • Oil-water separation method based on magnetic Janus particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] In a mixture of 20 ml of water and 2 ml of n-hexane, 0.1 g (0.45% by weight relative to the amount of the mixture) of magnetic Janus particles (such as figure 1 Magnetic silica / polystyrene-divinylbenzene Janus particles shown in ). Stir at a high speed of 1000r / min for 2min to form an oil-in-water emulsion. Adsorb the system with a 0.3T magnet for 5 minutes, and the n-hexane droplets (dispersed phase) stabilized by magnetic Janus particles are enriched and fixed by a magnetic field, so that the aqueous phase as the continuous phase flows out, thereby separating and containing n-hexane stabilized by magnetic Janus particles For the enriched emulsion part of the alkane droplets, the oil-water separation efficiency (oil-water separation efficiency=the weight of the separated oil phase (n-hexane in this embodiment) / the total weight of the oil phase in the mixture) is 90%.

[0088] To the obtained enriched emulsion part, an external magnetic field was applied with a 3T mag...

Embodiment 2

[0090] In 200ml refinery oily sewage, add 0.4g (relative to the amount of refinery oily sewage, 0.2% by weight) magnetic Janus particles (such as figure 1 Magnetic silica / polystyrene-divinylbenzene Janus particles shown in ), stirred at a high speed of 1000r / min for 2min to form an emulsion. After the system was adsorbed by a 0.8T magnet for 5 minutes, the water phase as the continuous phase flowed out, thereby separating the enriched emulsion part containing the oil stain stabilized by the magnetic Janus particles, realizing oil-water separation, and the oil-water separation efficiency was 92%.

[0091] To the obtained enriched emulsion part, an external magnetic field was applied with a 3T magnet, thereby demulsifying the enriched emulsion part. Magnetic Janus particles were recovered by continuously applying an external magnetic field with a 3 T magnet. Further, 100 ml of dichloromethane was added to the magnetic Janus particles, washed twice, and vacuum-dried to obtain m...

Embodiment 3

[0093] In 10ml of kitchen sewage, add 0.1g (relative to the amount of kitchen sewage, 1% by weight) magnetic Janus particles (such as figure 1 Magnetic silica / polystyrene-divinylbenzene Janus particles shown in ), stirred at a high speed of 2000r / min for 1min to form an emulsion. A 0.3T magnet was used to adsorb the system for 5 minutes, so that the water phase as the continuous phase flowed out, thereby separating the enriched emulsion part containing the oil stain stabilized by the magnetic Janus particles, realizing oil-water separation, and the oil-water separation efficiency was 95%.

[0094] To the obtained enriched emulsion part, an external magnetic field was applied with a 3T magnet, thereby demulsifying the enriched emulsion part. Magnetic Janus particles were recovered by continuously applying an external magnetic field with a 3 T magnet. Further, 20 ml of dichloromethane was added to the magnetic Janus particles, washed twice, and vacuum-dried to obtain magnetic ...

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Abstract

The invention relates to an oil-water separation method based on magnetic Janus particles. The oil-water separation method comprises the following steps: a) putting the magnetic Janus particles into an oil-water mixture, emulsifying at the speed of 13000-20000 r / min by using a high-speed shearing emulsifying machine or emulsifying at the speed of 300-5000 r / min by using a high-speed stirring machine to form an emulsion system comprising a continuous phase and a dispersed phase stabilized by the magnetic Janus particles, wherein each of the magnetic Janus particles simultaneously has a hydrophilic portion and a hydrophobic portion; and b) applying an external magnetic field A to the emulsion system such that the dispersed phase aggregates to form the emulsion system into an enriched emulsion fraction enriched with the dispersed phase and a liquid fraction free of the dispersed phase, thereby separating the enriched emulsion fraction from the liquid fraction.

Description

technical field [0001] The invention relates to an oil-water separation method, in particular to an oil-water separation method based on magnetic Janus particles as a solid particle emulsifier. Background technique [0002] In the petroleum industry (petroleum extraction, petroleum refining and petrochemical industry, etc.), machinery industry, textile industry, cosmetics manufacturing industry, catering industry or food industry and other industrial fields or in the field of water body protection, oily substances and water bodies usually mix. Case. In particular, since the oil-water mixture sometimes has substances that can act as emulsifiers (a class of compounds that make the mixed liquid of two or more mutually immiscible components form a stable emulsion), the oil-water mixture Emulsions may exist, and even oil-water mixtures may be emulsions as a whole. In an emulsion, the dispersed phase is dispersed in the continuous phase in the form of droplets (micron size). Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/02B01D17/022C02F1/40C02F1/48C02F101/30
CPCB01D17/02B01D17/0202C02F1/40C02F1/488C02F2101/30
Inventor 杨振忠梁福鑫
Owner TSINGHUA UNIV
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