Experimental and modeling approach to study separation of water in crude oil emulsion under non-uniform electrical field

Alinezhad, Kazem; Hosseini, Mahdi; Movagarnejad, Kamyar; Salehi, Mehdi

doi:10.1007/s11814-009-0324-2

Cited by 35 publications

(7 citation statements)

References 45 publications

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“…The application of heat to an emulsion promotes oil/water separation by reducing the viscosity of the oil and water, increasing the mobility and the settling rate of water droplets, and weakening the mechanical strength of the interfacial film [159]. However, heat by itself is not a cure-all and even has some disadvantages, such as loss of light oil fractions from the crude oil, delayed separation efficiency due to formation of air bubbles, the limited availability of temperature sensitive demulsifiers, and increased risk of corrosion of equipment and economical cost [160]. Along with mentioned methods, chemical treatment with demulsifiers (surface active agents) is the most common process for breaking emulsions as the chemical additives accelerate breaking the oil-in-water emulsions process [161].…”

Section: The Advantages and Disadvantages Of Some Demulsification Tecmentioning

confidence: 99%

An Overview of Recent Advances in State-of-the-Art Techniques in the Demulsification of Crude Oil Emulsions

et al. 2019

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The processing of crude oil often requires the extraction of a large amount of water. Frequently, crude oil is mixed with water to form water-in-crude oil emulsions as the result of factors such as high shear at the production wellhead and surface-active substances that are naturally present in crude oil. These emulsions are undesirable and require demulsification to remove the dispersed water and associated inorganic salts in order to meet production and transportation specifications. Additionally, the demulsification of these crude oil emulsions mitigates corrosion and catalyst poisoning and invariably maximizes the overall profitability of crude oil production. Recently, there has been growing research interest in developing workable solutions to the difficulties associated with transporting and refining crude oil emulsions and the restrictions on produced water discharge. Therefore, this paper reviews the recent research efforts on state-of-the-art demulsification techniques. First, an overview of crude oil emulsion types, formation, and stability is presented. Then, the parameters and mechanisms of emulsification formation and different demulsification techniques are extensively examined. It is worth noting that the efficiency of each of these techniques is dependent on the operating parameters and their interplay. Moreover, a more effective demulsification process could be attained by leveraging synergistic effects by combining one or more of these techniques. Finally, this literature review then culminates with propositions for future research. Therefore, the findings of this study can help for a better understanding of the formation and mechanisms of the various demulsification methods of crude oil to work on the development of green demulsifiers by different sources.

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Section: The Advantages and Disadvantages Of Some Demulsification Tecmentioning

confidence: 99%

An Overview of Recent Advances in State-of-the-Art Techniques in the Demulsification of Crude Oil Emulsions

et al. 2019

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“…Petrol (or gasoline) is a petroleum-derived, transparent liquid primarily used as a fuel in internal combustion engines. It contains over 300 different chemical compounds, mainly hydrocarbons (compounds that contain only carbon and hydrogen) [5] [6]. How good a petrol at resisting engine knock is an important indicator of the quality of petrol.…”

Section: Introductionmentioning

confidence: 99%

LSSVM Combined with SPA Applied to Near-Infrared Quantitative Determination of the Octane in Fuel Petrol Samples

Xu¹,

Gu²,

Chen³

et al. 2018

OJAppS

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Least square support vector machine (LSSVM) combined with successive projection algorithm (SPA) method was applied for near-infrared (NIR) quantitative determination of the octane number in fuel petrol. The NIR spectra of 87 fuel petrol samples were scanned for model establishment and optimization. First order derivative Savitzky-Golay smoother (1st-d'SG) was utilized to improve the NIR predictive ability. Its pretreatment effect was compared with the raw data. SPA was applied for the extraction of informative wavelengths. Considering the linear and non-linear training mechanism, LSSVM regression was employed to establish calibration models. The correlation coefficient (R) and root mean square error (RMSE) were used as the model evaluation indices; accordingly the octane number in fuel petrol was quantitatively determined with the prospective predictive indices. Results showed that after pretreated by 1st-d'SG, 8 SPA-selected wavelengths was generated as the inputs of LSSVM, so that the calibration models were optimized in the way of combining the SPA-LSSVM regression with the SG smoother. The prediction results were quite satisfactory, with the calibrating correlation coefficient of 0.951 and the RMSE of 3.282. An independent testing sample set was used to evaluate the optimal model, the testing correlation coefficient was 0.903 and the RMSE was 4.128. We conclude that NIR spectrometry is feasible to determine the octane in fuel petrol by establishing SPA-LSSVM models. The 1st-d'SG pretreatment has the advantage of selecting wavelengths containing the implicit information. The combination of 1st-d'SG pretreatment and SPA-LSSVM show its applicable potential to predict the octane number in fuel petrol.

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“…expedite the approach of droplets in an emulsion. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] However, very few studies discuss the use of non-uniform electric fields for phase coalescence and illustrate fully the microscopic mechanisms. 26,27 Molecular dynamics (MD) simulation has been focused on as a powerful tool for microscopic analysis of the nano-droplet dynamic behaviors based on the basic laws of the classical mechanics.…”

Section: Introductionmentioning

confidence: 99%

Microscopic mechanism on coalescence of the nano-droplets in present non-uniform electric field by molecular dynamics simulations

Chen

Wang

et al. 2016

AIP Advances

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Molecular dynamics simulations are performed to investigate the nano-droplets coalescence process in a non-uniform electric field. Coalescence of droplets driven by dielectrophoresis (DEP) could be observed clearly in a strong electric field. The efficiency of coalescence is remarkably improved about 2 times for non-uniform electric field as much as the efficiency for the uniform electric field. Increasing the gradient of the field, it is found that the DEP force will accelerate the droplets motion of coalescence. But when the gradient of the field increases to a certain degree, the DEP force acting on the droplets presents strongly and rapidly nonlinear increasing and induces the droplets forming the chain structure due to intensively elongating. Moreover, the average operating voltages is much lower in non-uniform electric field.

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Experimental and modeling approach to study separation of water in crude oil emulsion under non-uniform electrical field

Cited by 35 publications

References 45 publications

An Overview of Recent Advances in State-of-the-Art Techniques in the Demulsification of Crude Oil Emulsions

An Overview of Recent Advances in State-of-the-Art Techniques in the Demulsification of Crude Oil Emulsions

LSSVM Combined with SPA Applied to Near-Infrared Quantitative Determination of the Octane in Fuel Petrol Samples

Microscopic mechanism on coalescence of the nano-droplets in present non-uniform electric field by molecular dynamics simulations

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