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Amino-rich magnetic nanoparticle demulsifier preparation and application method thereof in treating waste emulsion

A technology of magnetic nanoparticles and particle demulsifiers, applied in chemical instruments and methods, separation methods, immiscible liquid separation, etc., can solve low oil content, unknown treatment effect, modification and modification, time-consuming preparation methods, etc. problems, to achieve the effect of fast separation rate, wide application range and low cost

Inactive Publication Date: 2019-02-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the magnetic materials involved in these technologies need to undergo complicated modification and modification, and the preparation methods are time-consuming, and most of these methods can only deal with low oil content, low surfactant concentration (tens to hundreds of milligrams per liter) or no surface Active agents and emulsions with large droplet sizes (tens of microns) are mainly used in the demulsification of crude oil emulsions; for those containing a large amount of soluble surfactants, high-concentration oils, and droplets at the nanometer level, they are very stable The treatment effect of waste emulsion from mechanical processing is unknown

Method used

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  • Amino-rich magnetic nanoparticle demulsifier preparation and application method thereof in treating waste emulsion
  • Amino-rich magnetic nanoparticle demulsifier preparation and application method thereof in treating waste emulsion
  • Amino-rich magnetic nanoparticle demulsifier preparation and application method thereof in treating waste emulsion

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Embodiment 1

[0035] Embodiment 1: Preparation of amino-rich magnetic nanoparticle demulsifier

[0036] Weigh 5.56g FeSO 4 ·7H 2 O and 11.6 g FeCl 3 ·6H 2 O in N 2 Dissolve in 250mL ultrapure water under the condition of 400rpm blowing off; dissolve 4.0g polyethyleneimine with a molecular weight of 600 in 50mL ultrapure water, add dropwise to the iron salt solution, stir for 10min, At 50°C, 20 mL of concentrated ammonia water (25%) was quickly added, and mechanically stirred at 400 rpm for 0.5 h. Washed three times with deionized water and recovered by magnetic field to obtain polyethyleneimine-modified Fe 3 o 4 magnetic nanoparticles. The obtained magnetic nanoparticles were dispersed into 250mL of 0.25% glutaraldehyde solution, mechanically stirred at 400rpm for 20min; magnetic field separation to obtain a stable magnetic nanoparticle demulsifier (M-HPEI) with a particle size of 15nm.

[0037] Preparation of the model emulsion: Dissolve the anionic surfactant SDBS in deionized wat...

Embodiment 2

[0039] Embodiment 2: Preparation of amino-rich magnetic nanoparticle demulsifier

[0040] Weigh 5.56g FeSO 4 ·7H 2 O and 11.6 g FeCl 3 ·6H 2 O in N 2 Dissolve in 250mL ultrapure water under the condition of 500rpm blowing off; dissolve 4.0g polyethyleneimine with a molecular weight of 1800 in 50mL ultrapure water, add dropwise to the iron salt solution, stir for 10min, At 60°C, 20 mL of concentrated ammonia water (25%) was quickly added, and mechanically stirred at 500 rpm for 1.0 h. Washed three times with deionized water and recovered by magnetic field to obtain polyethyleneimine-modified Fe 3 o 4 magnetic nanoparticles. The obtained magnetic nanoparticles were dispersed into 250mL of 0.5% glutaraldehyde solution, mechanically stirred at 500rpm for 30min; magnetic field separation to obtain a stable magnetic nanoparticle demulsifier (M-HPEI) with a particle size of 25nm.

[0041] Preparation of the model emulsion: Dissolve the anionic surfactant SDBS in deionized wat...

Embodiment 3

[0043] Embodiment 3: the preparation of amino-rich magnetic nanoparticle demulsifier

[0044] Weigh 5.56g FeSO 4 ·7H 2 O and 11.6 g FeCl 3 ·6H 2 O in N 2 Dissolve in 250mL ultrapure water under the condition of 600rpm blowing off; dissolve 4.0g polyethyleneimine with a molecular weight of 10000 in 50mL ultrapure water, add dropwise to the iron salt solution, stir for 10min, At 80°C, 20 mL of concentrated ammonia water (25%) was quickly added, and mechanically stirred at 600 rpm for 2.0 h. Washed three times with deionized water and recovered by magnetic field to obtain polyethyleneimine-modified Fe 3 o 4 magnetic nanoparticles. The obtained magnetic nanoparticles were dispersed into 250mL of 0.5% glutaraldehyde solution, mechanically stirred at 600rpm for 30min; magnetic field separation to obtain a stable magnetic nanoparticle demulsifier (M-HPEI) with a particle size of 50nm.

[0045] Preparation of the model emulsion: Dissolve the anionic surfactant SDBS in deionize...

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Abstract

The invention relates to an amino-rich magnetic nanoparticle demulsifier preparation and an application method thereof in treating a waste emulsion. Magnetic nanoparticle demulsifier makes polyethyleneimine branched molecules fixed to the surface of a magnetic core, and a large number of effective action sites are provided for the emulsion. The method for treating the waste emulsion particularly comprises the steps that a magnetic nanoparticle demulsifier suspension is added in the waste emulsion, the mixture is fully mixed to be uniform, and oil-water separation is conducted by means of a magnetic field. By means of the simple method, the novel magnetic nanoparticle demulsifier is synthesized, efficient and rapid demulsification of emulsions with different compositions and properties is achieved, the operation condition is simple, the application range is wide, and industrial application is easy. The treatment scheme is particularly suitable for the waste emulsion generated in the machining process.

Description

technical field [0001] The invention relates to the technical field of emulsified wastewater treatment, in particular to the preparation of an amino-rich magnetic nano particle demulsifier and its application method in treating waste emulsion. Background technique [0002] With the rapid development of mechanical processing and manufacturing technology and social economy, the use of mechanical processing emulsion and the output of emulsion wastewater are increasing. The composition of emulsion wastewater from mechanical processing is complex, containing toxic substances such as basic mineral oil, surfactants, extreme pressure agents, corrosion inhibitors, bactericides, foam inhibitors and heavy metals, which have serious impacts on humans, animals, plants and the ecological environment. Has been listed as national hazardous waste (HW09). The chemical oxygen demand (COD) of this type of emulsion wastewater is high, and the existence of various complex surfactants makes this ...

Claims

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Application Information

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IPC IPC(8): B01D17/05
CPCB01D17/048
Inventor 熊永娇黄翔峰彭开铭陆丽君刘佳刘婉琪吴宝强张佳路
Owner TONGJI UNIV
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