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A method for enhancing demulsification performance of demulsifier

A technology of demulsification and demulsification, which is applied in the field of environmental microorganisms to achieve the effects of effective regulation, speeding up demulsification rate and improving dehydration quality

Active Publication Date: 2019-08-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been reported that the special surface properties of magnetic nanoparticles can be used to regulate the properties of the microbial cell surface.

Method used

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  • A method for enhancing demulsification performance of demulsifier
  • A method for enhancing demulsification performance of demulsifier
  • A method for enhancing demulsification performance of demulsifier

Examples

Experimental program
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Effect test

preparation example Construction

[0035] Preparation of magnetic nanoparticles: weigh 5.56g FeSO 4 ·7H 2 O and 11.6 g FeCl 3 ·6H 2 O in N2 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 .

[0036] Modified synthesis of nanoparticles with different hydrophobicity and charge series: the Fe 3 o 4 @SiO 2 Disperse in 100mL of toluene, add 10mL of silylating reagents with different carbon chain lengths, ultrasonicate for 5min, ...

Embodiment 1

[0040] Depend on figure 1 It can be seen that the surface hydrophobicity of demulsifiers can be adjusted by using magnetic nanoparticles, and it is found that the demulsification rate of demulsifiers modified by different degrees of hydrophobicity is small, and the demulsification rate is quite different. The demulsification rate of the magnetic-responsive demulsifiers increased first and then decreased with the hydrophobicity. When the contact angle of the bacteria to water was in the range of 95-115°, the demulsification rate of the bacteria was improved; the demulsification rate modified by M@C9 The contact angle of milk bacteria was 105°, and the demulsification rate was the fastest, which was accelerated by about 1.0h. The improvement of demulsification rate indicates that the volume of emulsion that can be processed in the same time increases, which is of great significance for increasing the demulsification efficiency and reducing the cost of demulsification.

Embodiment 2

[0042] Depend on figure 2 It can be seen that the surface charge of demulsifiers can be regulated by using magnetic nanoparticles, and it is found that the demulsification rate and demulsification rate of demulsifiers modified by different charges are quite different. When the Zeta potential of the magnetic response demulsifier is lower than -25mV, the demulsification rate and demulsification rate of the magnetic response demulsifier are higher; when the Zeta potential of the magnetic response demulsifier exceeds -25mV, the demulsification rate and demulsification The rate decreased significantly, among which the demulsification rate decreased by 15%, and the demulsification rate slowed down by 1.0h. Therefore, for magnetic-responsive demulsifiers, when the charging range suitable for demulsification is -30~-20mV, at this time, the demulsification rate is increased by 0.5h relative to the bacteria under the premise of maintaining a high demulsification rate.

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Abstract

The invention relates to a method for enhancing the demulsifying property of demulsifying bacteria. The method includes the following steps that (1) Fe3O4 magnetic nanoparticles are prepared through a coprecipitation method, and the obtained Fe3O4 magnetic nanoparticles are modified so that hydrophobic magnetic nanoparticles or charged magnetic nanoparticles can be obtained; (2) biological demulsifying bacteria are cultivated to obtain bacterium suspension; (3) one of the hydrophobic magnetic nanoparticles or charged magnetic nanoparticles and the bacterium suspension are mixed according to the mass ratio of (0.1-0.4):1, so that magnetic response demulsifying bacteria with the high demulsifying property are obtained; and (4) demulsification of the magnetic response demulsifying bacteria is facilitated under the external magnetic field action. Compared with the prior art, the demulsifying property of the bacteria is enhanced, the demulsifying rate of the bacteria is increased, and dehydration quality of the bacteria is improved.

Description

technical field [0001] The invention relates to the technical field of environmental microorganisms, in particular to a method for enhancing the demulsification performance of demulsifiers. Background technique [0002] Due to its environmental friendliness and good adaptability to extreme conditions, microbial demulsifiers have great application prospects in oil exploration and oilfield pollution control. The exploration of the demulsification mechanism of bacteria has important guiding significance for the directional improvement of the demulsification effect of bacteria, and the research on the demulsification mechanism of bacteria has also received more and more attention. Most studies believe that the hydrophobicity and chargeability of the bacterial surface are the key factors affecting demulsification. Due to the limitation of the control means of the chargeability of the bacterial surface, more researches are on the relationship between hydrophobicity and demulsifica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D17/04B01D17/05C12N13/00C12N1/20C12R1/05
CPCB01D17/04B01D17/048C12N1/20C12N13/00
Inventor 彭开铭熊永娇黄翔峰刘佳陆丽君林兰娜王旭慧
Owner TONGJI UNIV
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