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Preparation method and application of pH sensitive type magnetic demulsifier with surface charges and hydrophilic-hydrophobic properties controlled

A surface charge, demulsifier technology, applied in chemical dehydration/demulsification, petroleum industry, treatment of hydrocarbon oil, etc., can solve the problem of reducing the reusability of magnetic particles, and achieve the effect of simple preparation process and good dispersibility

Active Publication Date: 2017-03-15
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual emulsified oily sewage, the surface of the emulsified oil droplets is usually negatively charged, often with anionic surface active substances, such as sodium dodecyl sulfate (SDS), etc.; while the two types of grafted polymers reported above (polyN-iso Propyl acrylamide, polymethacryldimethylaminoethyl ester) easily form complexes with anionic surfactants (Zhu P W, et al.Journal of Physical Chemistry B, 2015,119,359-371; KarjalainenE, et al.Macromolecules ,2014,47,2103-2111), greatly reducing the reusability of such magnetic particles

Method used

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  • Preparation method and application of pH sensitive type magnetic demulsifier with surface charges and hydrophilic-hydrophobic properties controlled
  • Preparation method and application of pH sensitive type magnetic demulsifier with surface charges and hydrophilic-hydrophobic properties controlled
  • Preparation method and application of pH sensitive type magnetic demulsifier with surface charges and hydrophilic-hydrophobic properties controlled

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0036] 1.6g FeCl 3 ·6H 2 O, 4.3g of sodium acetate and 0.48g of sodium citrate were dissolved in 60mL of ethylene glycol, stirred and dissolved, and the above solution was added to a 100mL autoclave, and reacted in a closed manner at 200°C for 12h to obtain Fe 3 o 4 Nanoparticles.

Embodiment 1

[0040] Take 0.2g Fe 3 o 4 Nanoparticles were dispersed in 160mL ethanol, 40mL water was added under the protection of nitrogen, then 0.6mL tetraethyl orthosilicate and 0.6mL 3-(methacryloyloxy)propyltrimethoxysilane (MPS) were added, and then hydrogen Adjust the pH value to 12 with sodium oxide, and react at 30°C for 6 hours to obtain Fe with polymerizable double bonds on the surface 3 o 4 @SiO 2 - MPS particles. 0.2gFe 3 o 4 @SiO 2 -MPS was dispersed in 40mL water, and 0.5g N-isopropylacrylamide, 0.5g methacrylic acid and 0.01g 2,2-azobis[2-(5-methyl-2-imidazoline) were added under nitrogen protection -2-yl)propane]dihydrochloride, reacted at 30°C for 24h to obtain a pH-sensitive magnetic demulsifier, and the grafting rate was determined to be 18.9% by thermogravimetric analysis. The above-mentioned pH-sensitive magnetic demulsifier is added to the emulsified oily sewage (diesel oil droplets, SDS concentration 10 -4 mol / L, turbidity is 1264NTU), adjust the pH value t...

Embodiment 2

[0042] Take 0.2g Fe 3 o 4 Disperse nanoparticles in 100mL ethanol, add 100mL water under nitrogen protection, then add 1.08mL methyl orthosilicate and 0.12mL vinyltriethoxysilane (VTES), then adjust the pH value to 8 with ammonia water, 20°C After 72 hours of reaction, the Fe with polymerizable double bonds on the surface was obtained. 3 o 4 @SiO 2 -VETS particles. 0.2g Fe 3 o 4 @SiO 2 -VETS was dispersed in 40mL of water, and 0.5g of N,N-diethylacrylamide, 0.5g of methacrylic acid and 0.01g of potassium persulfate were added under the protection of nitrogen, and reacted at 80°C for 0.5h to obtain a pH-sensitive magnetic demulsifier. The grafting rate was determined to be 13.5% by thermogravimetric analysis. Add the above-mentioned pH-sensitive magnetic demulsifier to emulsified oily sewage (gasoline droplets, SDS concentration 10 -4 mol / L, turbidity is 1128NTU), adjust the pH value to below 6, find that when the amount of magnetic demulsifier reaches 120mg / L, its tur...

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Abstract

The invention provides a preparation method and application of a pH sensitive type magnetic demulsifier with surface charges and hydrophilic-hydrophobic properties controlled. Based on magnetic Fe3O4 nanoparticles, through surface modification with silicon dioxide and a grafting copolymerization reaction, surface active monomers and pH sensitive monomer copolymer chains are introduced on the surfaces of the nanoparticles, and the surface grafting structure and the pH value are further adjusted to control the surface charges and hydrophilic-hydrophobic properties of the magnetic nanoparticles. The reduction of the pH value can enhance the hydrophobic property of the magnetic nanoparticles and reduce negative charge repulsive interaction between the demulsifier and oil droplets so that the demulsifier can be absorbed onto the surfaces of the emulsified oil droplets and quickly isolate the emulsified oil droplets under the action of an external magnetic field. Recycling of the magnetic nanoparticles can be achieved, and the demulsifier is be unlikely to be affected by pollution of negative-ion surface active materials in emulsified oil wastewater. According to the magnetic demulsifier, the preparation method is simple, the recycling process is convenient and efficient, the recycling performance is excellent, and therefore the magnetic demulsifier has very board application prospects in the fields of emulsified oil wastewater treatment and oil-water separation.

Description

technical field [0001] The invention relates to the synthesis of a pH-sensitive magnetic demulsifier with controllable surface charge and hydrophilicity and hydrophobicity, which can be applied to the treatment of emulsified oily sewage, and a specific use method of the magnetic demulsifier. specifically related to Fe 3 o 4 Surface silica modification and graft copolymerization of magnetic nanoparticles, and its application in emulsified oily wastewater treatment. Background technique [0002] With the increase in the proportion of tertiary oil recovery and the continuous development of offshore oil resources, along with the development of industries such as food, catering, cosmetics, pharmaceuticals and mechanical processing, oily sewage is increasing. Among them, the emulsified oily sewage is mainly in the form of emulsified oil droplets, small in size and strong in stability, so it is difficult to achieve efficient separation of oil and water by conventional methods suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/04
CPCC10G33/04C10G2300/1033C10G2300/201
Inventor 吕挺赵红挺张川张栋
Owner HANGZHOU DIANZI UNIV
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