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Composite type emulsion breaking flocculant

A composite flocculant technology, applied in the direction of flocculation/sedimentation water/sewage treatment, mining wastewater treatment, etc., can solve the problems of difficult treatment of aging oily sewage, achieve strong flocculation ability, high deoiling rate, and low reaction temperature Effect

Active Publication Date: 2015-08-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of difficult treatment of aging oily sewage, the present invention aims to provide a composite demulsification flocculant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The analysis of embodiment 1 aging oily sewage

[0034] Take 50ml of aged oily sewage, extract it repeatedly (7-8 times) with petroleum ether with a boiling range of 30-60°C, remove the oil in the water, put the extracted sewage into a dialysis bag, and use deionized water in a Soxhlet extractor Heated to reflux to obtain microbial flocs, and their properties were measured. The experimental results showed that the Zeta potential of the microbial flocs was -91.556mV, and the average particle size was 1002nm.

[0035] The effect of the microbial flocs on the stability of the oil-water emulsion was studied. The simulated oil-water emulsion was obtained by shear emulsification. After settling at 10°C for 2 hours, the oil content and Zeta potential in the water are shown in Table 1:

[0036] Table 1

[0037]

[0038] It can be seen from the experimental results that two simulated oil-water emulsions were prepared under the same conditions, and the oil content in the wate...

Embodiment 2

[0039] The screening of embodiment 2 demulsifiers

[0040] Screening of demulsifier According to SY5281-91 crude oil demulsifier performance test-bottle test method, take 50mL water sample in a graduated bottle, add demulsifier 400mg / L, observe at 50°C for 2 hours, and finally test the treated water sample Oil content in water, Zeta potential.

[0041] The screening of demulsifiers is mainly carried out for cationic, anionic, nonionic, amphoteric, biological and industrial demulsifiers. The experimental results are shown in Table 2.

[0042] Table 2

[0043]

[0044]

[0045] Obviously, the cationic demulsifier YL-07 has the best effect among the above-mentioned demulsifiers.

Embodiment 3

[0046] The selection of the compound demulsification flocculant of different proportions of embodiment 3

[0047] Dilute YL-07:PDMDAAC:PAC:W6590 with different mass concentration ratios with water to form a 0.1% demulsification flocculation solution. According to the SY5281-91 bottle test method, take 50mL water sample in a graduated bottle, add 320mg / L demulsification flocculation solution The milk flocculation solution was reacted in a water bath at a temperature of 50°C for 2 hours, and finally the oil content in water of the treated water sample was detected. The experimental results are shown in Table 3 below:

[0048] table 3

[0049]

[0050] Obviously, 60wt%-80wt% of YL-07; 10wt%-20wt% of PDMDAAC; 5wt%-10wt% of PAC; at 90%. Among them, the optimal ratio is: 62.5wt% of YL-07; 18.75wt% of PDMDAAC; 9.375wt% of PAC; and 9.375wt% of W6590, the oil removal rate is as high as 96.7%.

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Abstract

The invention relates to a composite type emulsion breaking flocculant, comprising 60-80wt% of a cationic demulsifier, 10-20wt% of poly-dimethyl-diallyl-ammonium chloride and 5-10wt% of aluminium polychlorid, as well as 5-10wt% of polymethylacrylic acid, wherein the cationic demulsifier is a polymer having a chemical formula shown in the specification, wherein R1 can be -(CH2)2NH2, -(CH2)3N(CH3)2, -(CH2)6NH2 and (CH2)9CH3; R2 can be -CH3, -CH2NH2, -C2H5, -CH2NHCH2NH2; R3 can be -CH3, -CH2NH2, -C2H5, -CH2NHCH2NH2; X is between 10 and 50; Y is between 1 and 5. The composite type emulsion breaking flocculant disclosed by the invention can be used for finishing the operations of emulsion breaking, flocculation, oil removal and sewage purification and has the advantages of low reaction temperature, high reaction speed, high oil removal rate and capability of greatly reducing turbidity of water with oil removed.

Description

technical field [0001] The invention relates to the treatment of oil field sewage, in particular to a composite demulsification flocculant. Background technique [0002] In the process of oil extraction, oilfield produced water is usually called oily sewage. After long-term storage, oily sewage usually has a dark color and contains high concentrations of organic pollutants and a large number of microbial flocs. At this time, the oily sewage is also called aged oily sewage. The oil-water emulsion in the aged oily sewage is more stable, and it is often very difficult to filter and separate it. If the treatment is not appropriate or sufficient, it will not only cause waste of resources, but also cause serious environmental pollution and affect people's daily life. . [0003] Existing methods for treating oily sewage include gravity sedimentation, flotation, demulsification, membrane separation and flocculation. As the most effective method for treating sewage in oil fields, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F103/10
Inventor 杨敬一徐心茹严良张洪莹李少萍
Owner EAST CHINA UNIV OF SCI & TECH
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