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Oil emulsion demulsification is reviewed

by:Deyuan      2020-09-03
Oil emulsion demulsification research progress
in the process of industrial oil/water separation, however, oil emulsion harmful to oil-water separation effect. Therefore, many scholars devoted to the demulsification technology research. Demulsification method can generally be divided into chemical, biological, physical demulsification etc. Three methods of demulsification. In order to achieve better demulsification, often several demulsification method will unite.
    ( 1) Chemical chemical demulsification principle is used to change the oil-water interface properties of oil-water interface membrane, the dispersed phase to flee and coalescence, so as to achieve the purpose of demulsification. The demulsification effect is good, the most widely application scope. Including the electrolyte, emulsion breaker, etc. Wu Mou for daqing oil field, such as processing of chemical flooding produced fluid caused by oil field produced water containing surfactants such as oil-water separation caused difficulties, embarks from the nonionic demulsifier ideas developed oil/water separating agent. In the original process under the condition of invariable, after joining the demulsifier, the oil content in sewage by 99. 0 mg/L to 9. 9mg/L。 But because of the addition of the oil-water emulsion demulsifier, the introduction of new chemical reagent, cause secondary pollution, subsequent treatment to remove demulsifier.
    ( 2) Biological demulsification method principle is the use of microbial metabolism of demulsification surface active ingredients or the use of microbial cells for demulsification. Biological demulsification has the advantages of demulsification efficiency and environmental protection, in terms of oil-water emulsion demulsification has good application prospect. Biological demulsification method is a new type of emulsion breaking, for effective biological demulsifier composition has not been fully understand clearly, so biological demulsification method is still in the exploratory stage.
    ( 3) Physical demulsification method includes high-speed centrifugal demulsification method, gravity sedimentation demulsification method, membrane demulsification method, heating demulsification method, ultrasonic demulsification method, etc. Physical demulsification is through the physical way to the oil-water interface membrane demulsification. For example, gravity settling demulsification and centrifugal demulsification are using oil-water two phase density is different, both in the effect of gravity and centrifugal force down and destroy the oil-water interface membrane demulsification. The present study is more membrane demulsification method. The method is under a certain external force by filtering effect or oil and water to the membrane material of different wettability to implement demulsification. Membrane demulsification has higher demulsification efficiency, less energy consumption, no need to add the advantages of demulsifier and become one of the hotspot of the research on demulsification people.
- a choice such as a variety of oil-water emulsion system, studies the influence of different operating conditions on the demulsification, studies have shown that through the size of the pressure and the membrane pore size on the demulsification process, through the increase of the pressure and the membrane pore size is good for fluid volume increases, but reduce demulsification efficiency. Under the lower through pressure, using large aperture membrane, fluid volume can get higher, and also higher demulsification efficiency.
Daiminge PTFE microporous membrane was used to contain emulsifiers such as different dodecane/water microemulsion of demulsification, the results show that the microemulsion after PTFE microporous membrane, the average particle size of oil droplets grow from 10 microns to 100 microns, obtains a good effect on demulsification.
the sun high temperature by spraying a plasticizing methods, such as the preparation of super hydrophobic shearing section. at oil-wet omentum, applied to diesel oil and water emulsification system demulsification experiments, found under through differential pressure is less than 70 kpa, the film thickness is 0. 4 mm, gravity sedimentation after demulsification, the concentration of diesel oil in water less than 10 mg/L. Demulsification effect is very good.
in the actual fluid of oily wastewater treatment, need a pump to transport liquid ingredients, however, rely on the rotation of the impeller to transport liquid pump will exacerbate oily wastewater emulsion, the CPC drops of smaller particle size, so that the oily wastewater, causing oil and water is more difficult to separate. So the CPC phase state of being different, considering the oily wastewater, the preparation of two kinds of hydrophobic membrane, the super hydrophobic membrane and super hydrophobic membrane demulsification.
based on the theory of surface wettability, preparation of ultra thin on the surface of the water meter requires two conditions: enough surface roughness and low surface energy materials. Ptfe ( PTFE) As a kind of low surface energy material, not easy to adhere to any material that is often used to as a super hydrophobic material on the surface of the water meter, and has the advantages of corrosion resistance, high temperature resistant; But ptfe and because it does not sticky not easily attached with the basal material, easy to fall off from the surface, therefore, is to be with ptfe as the raw material preparation of super hydrophobic membrane better applied in oil-water separation of practical problems, the first thing to solve the problem of ptfe on substrate bonding strength. PPS can almost bonding on all metals and materials, and also with a strong resistance to chemical corrosion, so the use of PPS and ptfe synergy, enhanced ptfe adhesion to substrate.
so this chapter by spraying a sintering method of preparation of super hydrophobic membrane. Experiment with porous stainless steel plate as the base, the spray gun spraying layers of different proportion PPS - PTFE composite coating, and then high plasticizing, after the surface of the membrane structure and oil resistance and water resistance of the film were characterized.
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