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Demulsification Behavior, Characteristics, and Performance of Surfactant Stabilized oil-in-water emulsion under Bidirectional Pulsed Electric Field

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China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 10-22页

作者： Ren Boping Kang Yong Zhang Xianming Gong Haifeng Chen Ling Liu Yunqi Engineering Research Center for Waste oil Recovery Technology and Equipment Ministry of EducationChongqing Technology and Business UniversityChongqing 400067China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China State Key Laboratory of Heavy oil Processing China University of Petroleum(East China)Qingdao 266580China

As a novel electric demulsification method,bidirectional pulsed electric field(BPEF)was employed to demulsify the surfactant stabilized oil-in-water(SSO/W)emulsion for oil/water separation in this *** demulsification behavior,characteristics,and stages under BPEF were *** was discovered that BPEF drove SSO/W emulsion to move and form vortexes,during which the oil droplets aggregated and accumulated to generate an oil droplet layer(ODL).ODL subsequently transformed into a continuous oil layer(COL)leading to the demulsification and separation of SSO/W *** conversion rate of ODL to COL was defined and used to evaluate the demulsification process and reflect the coalescence ability and transformation efficiency of dispersed oil droplets into ***,the effects of BPEF voltage,frequency,duty cycle,ratio of pulse output time,and surfactant type and content on the demulsification performance were *** optimal values of BPEF parameters for demulsification operation were 400 V,25 Hz,50%,and 4:1.O/W emulsion containing anionic surfactant was apt to be demulsified by BPEF,nonionic surfactant took the second place and cationic surfactant was the most difficult.A high surfactant content was not conducive to the BPEF *** work is anticipated to provide useful guidance for oil/water separation and oil recovery from actual emulsified oily wastewater by BPEF.

关键词： oil-in-water emulsion surfactant demulsification bidirectional pulsed electric field

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Efficient demulsification of ultralow-concentration crude oil-in-water emulsion by three-dimensional superhydrophilic channels

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Science China Materials 2022年第1期65卷 213-219页

作者： Jian Jin Jun Su Chengjie Xiang Bo Xu Kaiqi Zhao Hongyun Li Lidong Sun State Key Laboratory of Mechanical Transmission School of Materials Science and EngineeringChongqing UniversityChongqing 400044China Jinhai oil Production Plant PetroChina Liaohe OilfieldPanjin 124000China

Efficient extraction of crude oil,the major energy resource of current concern and high demand worldwide,is of paramount importance in both energy and environmental ***,it remains a great challenge to separate the crude oil-in-water emulsions with an ultralow oil content ofwater superoleophobic feature,which enables rapid formation of water channels that expel the oil droplets.A high separation efficiency of ∼96.8% and low total organic carbon content of ∼6 ppm are thus achieved for the ultralow-concentration crude oil-in-water *** pressure and time dependence of the separation process is systematically studied with a critical pressure of 12.25 *** a high performance is close to the theoretical limit imposed by the ultralow concentration,and shows obvious advances over either organic membranes or inorganic frameworks.

关键词： oil/water separation oil-in-water emulsion crude oil superhydrophilic channels TiO2 nanotubes

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MILP synthesis of separation processes for waste oil-in-water emulsions treatment

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Frontiers of Chemical Science and Engineering 2016年第1期10卷 120-130页

作者： Zorka N. Pintaric Gorazd P. Skof Zdravko Kravanja Faculty of Chemistry and Chemical Engineering University of Maribor Smetanova ulica 17 SI-2000 Maribor Slovenia EKOLID Ekologko svetovanje Raziskave in razvoj Ru~ka cesta 55 SI-2000 Maribor Slovenia

This paper presents a novel synthesis method for designing integrated processes for oil-in-water （O/W） emulsions treatment. General superstructure involving alternative separation technologies is developed and modelled as a mixed integer linear programming （MILP） model for maximum annual profit. Separation processes in the superstructure are divided into three main sections of which the pretreatment and final treatment are limited to the selection of one altemative （or bypass） only, while within the intermediate section various combinations of different technologies in series can be selected. Integrated processes composed of selected separation techniques for given ranges of input chemical oxygen demand （COD） can be proposed by applying parametric analyses within the superstructure approach. This approach has been applied to an existing industrial case study for deriving optimal combinations of technologies for treating diverse oil-in- water emulsions within the range of input COD values between 1000 mg-L-1 and 145000 mgL t. The optimal solution represents a flexible and profitable process for reducing the COD values below maximal allowable limits for discharging effluent into surface water.

关键词： oil-in-water emulsion chemical oxygen demand superstructure process synthesis MILP

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Effects of Different Heavy Crude oil Fractions on the Stability of oil-in-water emulsions—the film properties of heavy crude functional components and water system

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Petroleum Science 2005年第1期2卷 93-96页

作者： ChenYaowu FanWeiyu SongYuanming NanGuozhi LiShuiping ChenShukun UniversityofPetroleum Dongving257061ShandongChina

A series of π-A isotherms are drawn to study the film properties of the components with Langmuir-Blodgett technique. The effects of the aromaticity of spread solvents and pH value on the air/water film formed by the components are investigated. Acid fraction and asphaltene can form stable two-dimensional insoluble films on an air/water surface. The surface film pressure of acid fraction and asphaltene is higher and more stable than that of the other fractions. The surface film pressure of the fraction increases evidently under the basic condition (pH=12). The results show that the interfacial activity of acid fraction and asphaltene is superior to that of the other fractions and the basic condition is favorable to the stability of the O/W emulsion.

关键词： viscous crude oil-in-water emulsion pressure-area isotherm

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Emulsification of Indian heavy crude oil using a novel surfactant for pipeline transportation

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Petroleum Science 2017年第2期14卷 372-382页

作者： Shailesh Kumar Vikas Mahto Department of Petroleum Engineering Indian Institute of Technology (Indian School of Mines) Dhanbad Jharkhand India

The most economical way to overcome flow assurance problems associated with transportation of heavy crude oil through offshore pipelines is by emulsifying it with water in the presence of a suitable *** this research,a novel surfactant,tri-triethanolamine monosunflower ester,was synthesized in the laboratory by extracting fatty acids present in sunflower（Helianthus annuus）*** surfactant was used to prepare oil-in-water emulsions of a heavy crude oil from the western oil field of *** emulsification,a dramatic decrease in pour point as well as viscosity was *** the prepared emulsions were found to be flowing even at 1°*** emulsion developed with 60%oil content and 2wt%surfactant showed a decrease in viscosity of 96%.The stability of the emulsion was investigated at different temperatures,and it was found to be highly *** effectiveness of surfactant in emulsifying the heavy oil in water was investigated by measuring the equilibrium interfacial tension（IFT）between the crude oil（diluted）and the aqueous phase along with zeta potential of emulsions.2wt%surfactant decreased IFT by almost nine times that of no *** results suggested that the synthesized surfactant may be used to prepare a stable oil-in-water emulsion for its transportation through offshore pipelines efficiently.

关键词： Heavy crude oil oil-in-water emulsion Pipeline transportation Sunflower oil Rheology Stability

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