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Demulsification method for oil-in-water system emulsion

An oil-in-water, system technology, applied in the field of demulsification, can solve the problems of difficult removal, high cost, increased processing difficulty and processing cost, etc., and achieve the effect of reducing the cost of demulsification

Inactive Publication Date: 2017-05-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of chemical demulsifiers brings some problems: chemical demulsifiers are generally insoluble macromolecular organic substances, and organic solvents are needed as auxiliary agents when used, which introduces new pollutants; chemical demulsifiers are refractory substances, and when added to emulsion Once in the liquid, it is difficult to remove from the system, which increases the difficulty and cost of the subsequent treatment process
However, the cost of the membrane treatment method is high, and it faces the problem of easy membrane pollution; while the electric field demulsification and centrifugal separation require high cost, and the equipment loss is large; although the biological demulsifier has high demulsification efficiency, the demulsification bacteria need to go through A longer period of cultivation can be applied to actual treatment, and it is difficult to recover the used demulsifiers, so these methods are not suitable for industrial production

Method used

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  • Demulsification method for oil-in-water system emulsion
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  • Demulsification method for oil-in-water system emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of magnetic nanoparticles: weigh 5.56g FeSO 4 ·7H 2 O and 11.6 g FeCl 3 ·6H 2 O, in N 2 Dissolve in 350 mL of ultrapure water at 500 rpm under stripping; quickly add 20 mL of concentrated ammonia water (25%), and stir for 6 hours. Wash three times with deionized water, and recover Fe by magnet 3 o 4 magnetic nanoparticles. will get Fe 3 o 4 The magnetic nanoparticles were dispersed into the mixed solution (120mL ethanol, 30mL ultrapure water, 2mL ammonia water), and ultrasonicated for 5min. Add 4mL tetraethyl orthosilicate to the above solution, then ultrasonicate for 5min, mechanically stir for 6h (500rpm); collect in an external magnetic field, and obtain silica-modified magnetic nanoparticles Fe 3 o 4 @SiO 2 .

[0029] Modified synthesis of nanoparticles with different charge series: the Fe 3 o 4 @SiO 2 Disperse in 100mL toluene, add 4mL silylating reagent (KH560), and stir at 90°C for 6h. Wash with ethanol, recover the magnet and then dis...

Embodiment 2

[0036] With the Fe that embodiment 1 obtains 3 o 4 @NH 2 It is applied to the treatment of an emulsion produced in a mechanical processing process, and the waste emulsion is produced in the process of mechanical processing of lubricating oil produced by Frank Chemical Co., Ltd. The magnetic nanoparticles with different surface charges have significant differences in the demulsification performance of the emulsion. When the Zeta potential of the magnetic nanoparticles is in the range of +32-+50mV, the oil removal rate of the magnetic nanoparticles can reach 90%. Therefore, the positively charged magnetic nanoparticles on the surface can not only deal with model emulsions with relatively simple components, but also can be used to deal with real emulsions with complex components. It is a potential high-efficiency demulsifier.

Embodiment 3

[0038] Adopt the operation step similar to embodiment 1, difference is:

[0039] (1) FeCl 3 and FeSO 4 The masses of are 8.115g and 5.56g respectively;

[0040] (2) Fe 3 o 4 Magnetic nanoparticles were mixed with tetraethyl orthosilicate at a ratio of 2g:0.5mL to obtain silica-modified magnetic nanoparticles Fe 3 o 4 @SiO 2 ;

[0041] (3) Fe 3 o 4 The mixing temperature of magnetic nanoparticles and tetraethyl orthosilicate is 20°C, the mixing time is 10h, and the stirring rate is 800rpm;

[0042] (4) Fe 3 o 4 @SiO 2 The mixing temperature with tetraethylenediamine is 20°C, the mixing time is 10h, and the stirring rate is 800rpm;

[0043] (5) Fe will be obtained 3 o 4 @NH 2 It is applied to the oil-in-water emulsion produced by the lubricating oil produced by Frank Chemical Co., Ltd. in the process of mechanical processing. A magnetic field with a magnetic field strength of 0.5T is applied for demulsification, and the demulsification time is 10 minutes.

[004...

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Abstract

The invention relates to a demulsification method for an oil-in-water system emulsion. The method comprises the following steps: (1) preparing Fe3O4 magnetic nanoparticles through a coprecipitation method and carrying out amino modification on the Fe3O4 magnetic nanoparticles to obtain charged Fe3O4@NH2 magnetic nanoparticles; and (2) putting the charged Fe3O4@NH2 magnetic nanoparticles into the oil-in-water system emulsion, applying an external magnetic field and carrying out demulsification on the oil-in-water system emulsion. Compared with the prior art, demulsification of 95% oil-in-water emulsion is completed within 2-10 minutes; the demulsification efficiency is high and the demulsification effect is good; recycling and reusing of a demulsifier are achieved; the oil-in-water system emulsion can be reused for 7 times on the basis of not affecting demulsification, so that the demulsification cost is reduced.

Description

technical field [0001] The invention relates to the field of demulsification, in particular to a demulsification method for oil-in-water system emulsions. Background technique [0002] A large amount of emulsion or oily wastewater is produced during oilfield exploitation, mechanical processing, cleaning and other processes. Effective treatment of waste emulsion is an important part of subsequent oil recovery and wastewater treatment. The industrial wastewater produced above is generally an oil-in-water emulsion. Due to the complex composition of oil-in-water emulsion, it is difficult to achieve efficient and rapid treatment. Generally, a combination of multiple treatment processes is required, which is costly and long-term. And at present, most of our country uses chemical demulsifiers to deal with, and polymers are the main ones. However, the use of chemical demulsifiers brings some problems: chemical demulsifiers are generally insoluble macromolecular organic substances,...

Claims

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Application Information

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IPC IPC(8): C02F1/40
CPCC02F1/40
Inventor 熊永娇彭开铭黄翔峰刘佳陆丽君刘婉琪
Owner TONGJI UNIV
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