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Demulsification method for oil-in-water emulsion, and process

An oil-in-water, emulsion technology, which is applied in the field of demulsification of oil-in-water emulsions, can solve the problems of environmental hazards, long time consumption, large floor space, etc., and achieves the effect of good applicability

Inactive Publication Date: 2019-02-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional demulsification method: the gravity sedimentation method occupies a large area of ​​equipment, takes a long time to rely on natural sedimentation, and has low efficiency; the centrifugation method consumes a lot of energy, and the treatment cannot be continuous; Secondary pollution is carried out, and oil recovery is difficult at the same time, which is also harmful to the environment and consumes a lot of chemicals; membrane separation and adsorption methods cause pollution of membranes and adsorbents, long processing time, and high costs.
At the same time, for some high-viscosity oily wastewater and highly emulsified oil-in-water emulsion, these traditional methods are more difficult to effectively break the emulsion phase
Therefore, relying on these traditional methods for demulsification can no longer meet the requirements of high efficiency, energy saving and environmental protection.

Method used

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  • Demulsification method for oil-in-water emulsion, and process
  • Demulsification method for oil-in-water emulsion, and process
  • Demulsification method for oil-in-water emulsion, and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take 300mL of water-in-diesel emulsion (diesel oil is commercially available 0#), and the oil content is 0.5%. The electric field form selects bidirectional pulsed electric field, the waveform is square wave, the voltage is set to 900V, the frequency is set to 50Hz, the total duty cycle is set to 0.5, and the positive and negative duty cycle is set to 0.5. The main body of the oil-water separator is a circular cylinder, and the electrode assembly is an integral ring-shaped electrode assembly (see Figure 9 and Figure 10 ), the number of single electrodes installed is 47, the angle difference between adjacent electrodes is 30°, the diameter of a single electrode is 5mm, the distance between the electrode assembly and the inner wall of the oil-water separator is kept at 12mm, and a metal The electrode serves as the positive pole, and the rest serve as the negative pole. After the electric field was applied for 2 hours, the efficiency of demulsification and oil removal ...

Embodiment 2

[0052] Take 300mL of water-in-diesel emulsion (diesel oil is commercially available 0#), and the oil content is 0.5%. The electric field form selects positive pulse electric field, the waveform is square wave, the voltage is set to 1000V, the frequency is set to 50Hz, the total duty cycle is set to 0.3, and the positive and negative duty cycle is set to 0.5. The main body of the oil-water separator is a square cylinder, and the electrode assembly is an integrated rectangular arrangement of electrode assemblies (see Figure 7 and Figure 8 ), the number of single electrodes installed is 50, the distance between adjacent electrodes is 10mm, and the diameter of a single electrode is 5mm. The distance between the electrode assembly and the inner wall of the oil-water separator is kept at 15 mm, and the four rod-shaped metal electrodes located in the center of the orifice plate are used as positive electrodes, and the rest are used as negative electrodes. After the electric field...

Embodiment 3

[0054] Take 300mL of water-in-diesel emulsion (diesel oil is commercially available 0#), and the oil content is 1%. The electric field form is pulsed AC electric field, the waveform is a rectangular wave, the voltage is set to 800V, the frequency is set to 50Hz, the total duty cycle is set to 0.5, and the positive and negative duty cycle is set to 0.3. The main body of the oil-water separator is a square cylinder, and the electrode assembly is a split rectangular electrode assembly 2-1 (see image 3 and Figure 4 ), the number of small units installed is 8, the number of single electrodes installed is 64, the distance between adjacent electrodes is 5mm, and the diameter of a single electrode is 5mm. The distance between the electrode assembly and the inner wall of the oil-water separator is kept at 10mm. The metal electrodes of 1-10 small units located on the left side of the electrode assembly are used as positive electrodes, and the rest are used as negative electrodes. A...

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Abstract

The invention discloses a demulsification method for an oil-in-water emulsion, and a process, and belongs to a physical demulsification method. According to the method, an alternating electric field output by a power supply is applied in an oil-in-water emulsion by a positive electrode and a negative electrode, and the emulsion and the oil-containing wastewater are subjected to demulsification andoil-water phase separation at a room temperature; the basic principle of the method is that oil droplets move and aggregate in different forms of alternating electric fields by using the oil dropletsurface charge and the oil droplet dielectrophoresis characteristics so as to achieve the purposes of rapid demulsification and oil-water phase separation; compared with other traditional demulsification methods such as gravity method, centrifugation method, chemical method, membrane filtration method and the like, the method of the present invention has advantages of simple equipment, simple operation, less input, no secondary pollution, high separation efficiency of oil-water two-phase and the like; and the method has good application prospect and great economic value.

Description

technical field [0001] The invention belongs to the field of heterogeneous phase separation, oil-water two-phase separation technology, in particular to a demulsification method and process of oil-in-water emulsion. Background technique [0002] Oil removal in water has always been the ultimate goal of oily wastewater treatment and demulsification of oil-in-water emulsions. How to efficiently, quickly and economically remove and recycle oil in water can not only reduce the environmental pollution of wastewater, purify water quality, and save water resources , At the same time, a large amount of oily substances can be recovered to avoid waste of resources. Therefore, demulsification of oil-in-water emulsions is a key step to achieve these goals. However, the traditional demulsification method: the gravity sedimentation method occupies a large area of ​​equipment, takes a long time to rely on natural sedimentation, and has low efficiency; the centrifugation method consumes a ...

Claims

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Application Information

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IPC IPC(8): C02F1/48C02F1/40
CPCC02F1/40C02F1/48C02F2201/48
Inventor 康勇任博平张景源
Owner TIANJIN UNIV
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