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Bionic functional membranes for separation of oil-in-water emulsions

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Friction 2024年第9期12卷 1909-1928页

作者： Chaolang CHEN Ruisong JIANG Zhiguang GUO School of Mechanical Engineering Sichuan UniversityChengdu 610065China School of Materials Science and Engineering Hubei UniversityWuhan 430062China

The separation of oil-in-water emulsion is an urgent challenge because its massive production and discharge from daily and industrial activities have caused severe hazards to the ecosystem and serious threats to human *** technology is considered an outstanding solution strategy for the separation of oil-in-water emulsions due to its unique advantages of low cost,high efficiency,easy operation,and environmental ***,the membrane is easily fouled by the emulsion oil droplets during the separation process,causing a sharp decline in permeation flux,which greatly inhibits the long-term use of the membrane and largely shortens the membrane’s ***,it was found that endowing the membranes with special wettability e.g.,superhydrophilic and superoleophobic can greatly enhance the permeability of the continuous water phase and inhibit the adhesion of oil droplets,thus promoting the separation performance and anti-oil-fouling property of membrane for oily *** this paper,we review and discuss the recent developments in membranes with special wettability for separating oil-in-water emulsions,including the mechanism analysis of emulsion separation membrane,membrane fouling issues,design strategies,and representative studies for enhancing the membrane’s anti-oil-fouling ability and emulsion separation performance.

关键词： bionic surface membranes wettability oil-in-water emulsions oil-water separation

Measurement of water holdup in oil-in-water emulsions in wellbores using microwave resonance sensor

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Applied Geophysics 2021年第2期18卷 185-197,273页

作者： Jin-Ningde Liu-Dongyang Bai-Landi Ren-Yingyu School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China

In this study,we propose a new method for water holdup measurement of oil-in-water emulsions with a microwave resonance sensor(MRS).The angle and length of the electrode plate are optimized by HFSS simulation *** a vector network analyzer(VNA),a static calibration experiment is conducted,and the resonant frequency distribution of oil-in-water emulsions is analyzed within an 80%–100%water holdup *** addition,we observe and analyze the micron-sized oil bubble structure in the emulsifi ed state with an optical *** this basis,a dynamic experiment of oil-in-water emulsions with high water cut and low velocity in a vertical upward pipe is conducted.S_(21) response curves of the MRS are obtained by the VNA under diff erent working conditions in real ***,we analyze the relationship between the resonant frequency and water *** results show that the MRS has an average resolution of 0.096%water cut for high water cut oil-in-water emulsions within the frequency range of 2.2–2.8 GHz.

关键词： oil-in-water emulsions water holdup measurement high water cut microwave resonance sensor

Effects of the original state of sodium-based additives on microstructure,surface characteristics and filtration performance of SiC membranes

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Chinese Journal of Chemical Engineering 2023年第11期63卷 1-11页

作者： Yuling Xie Qilin Gu Qian Jiang Zhaoxiang Zhong Weihong Xing National Engineering Research Center for Special Separation Membrane State Key Laboratory of Materials-Oriented Chemical EngineeringCollege of Chemical EngineeringNanjing Tech UniversityNanjing 210009China School of Environmental Science and Engineering Nanjing Tech UniversityNanjing 211816China

Sodium-contained compounds are promising sintering additives for the low-temperature preparation of reaction bonded SiC *** sodium-based sintering additives in various original states were attempted,their effects on microstructure and surface properties have rarely been *** this work,three types of sodium-based additives,including solid-state NaA zeolite residue(NaA)and liquidstate dodecylbenzene sulfonate(SDBS)and water glass(WG),were separately adopted to prepare SiC membranes,and the microstructure,surface characteristics and filtration performance of these SiC membranes were comparatively *** showed that the SiC membranes prepared with liquid-state SDBS and WG(S-SDBS and S-WG)showed lower open porosity yet higher bending strength compared to those prepared with solid-state NaA(S-NaA).The observed differences in bending strength were further interpreted by analyzing the reaction process of each sintering additive and the composition of the bonding phase in the reaction bonded SiC ***,the microstructural differentiation was correlated to the original state of the *** addition,their surface characteristics and filtration performance for oil-in-water emulsion were examined and correlated to the membrane *** S-NaA samples showed higher hydrophilicity,lower surface roughness(1.80μm)and higher rejection ratio(99.99%)in O/W emulsion separation than those of S-WG and *** can be attributed to the smaller mean pore size and higher open porosity,resulting from the originally solid-state NaA ***,this work revealed the comprehensive effects of original state of sintering additives on the prepared SiC membranes,which could be helpful for the application-oriented fabrication by choosing additives in suitable state.

关键词： SiC membrane Sintering additive Reaction sintering Microstructure oil-in-water emulsions

Experimental investigation of the effects of various parameters on viscosity reduction of heavy crude by oil-water emulsion

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Petroleum Science 2015年第1期12卷 170-176页

作者： Talal Al-Wahaibi Yahya Al-Wahaibi Abdul-Aziz R.Al-Hashmi Farouq S.Mjalli Safiya Al-Hatmi Petroleum & Chemical Engineering Department College of Engineering Sultan Qaboos University

The effects of water content, shear rate, temperature, and solid particle concentration on viscosity reduction （VR） caused by forming stable emulsions were investigated using Omani heavy crude oil. The viscosity of the crude oil was initially measured with respect to shear rates at different temperatures from 20 to 70℃. The crude oil exhibited a shear thinning behavior at all the temperatures. The strongest shear thinning was observed at 20℃. A non-ionic water soluble surfactant （Triton X-100） was used to form and stabilize crude oil emulsions. The emulsification process has significantly reduced the crude oil viscosity. The degree of VR was found to increase with an increase in water content and reach its maximum value at 50 % water content. The phase inversion from oil- oil emulsion occurred at 30 in-water emulsion to water-in- % water content. The results indicated that the VR was inversely proportional to temperature and concentration of silica nanoparticles. For water-in-oil emulsions, VR increased with shear rate and eventually reached a plateau at a shear rate of around 350 s^-1. This was attributed to the thinning behavior of the continuous phase. The VR of oil-in-water emulsions remained almost constant as the shear rate increased due to the Newtonian behavior of water, the continuous phase.

关键词： Viscosity reduction Phase inversion Non-newtonian fluid oil-in-water emulsions Heavy crude oil

Coconut Press Cake Alkaline Extract—Protein Solubility and Emulsification Properties

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Food and Nutrition Sciences 2013年第9期4卷 29-37页

作者： Borges Chambal Bjorn Bergenstahl Petr Dejmek Department of Chemical Engineering Faculty of EngineeringEduardo Mondlane UniversityMaputoMozambique Department of Food Technology Engineering and Nutrition Lund UniversityLundSweden

The solubility and the emulsification properties of a crude freeze dried alkaline protein extract (APE), 30% protein, obtained from coconut milk press cake by one step extraction at pH 11, were characterized at pH 2 to 11, and the cream and subnatant fractions of the emulsion studied by SDS-PAGE electrophoresis. The protein solubility followed U profile, showing a minimum at pH 3 to 4, close to but not identical to reported iso-electric points of 4 - 5 for many coconut protein fractions. The extract showed good capacity to form oil-in-water emulsion outside the low solubility pH range. The bands that appeared to play a role in the emulsification were found at 32 and 42 kDa in SDS-PAGE electrophoresis, but the most predominant absorbed band was at 23 kDa.

关键词： Coconut Proteins Coconut Milk Press Cake Alkaline Extraction oil-in-water emulsions Solubility SDS-PAGE Electrophoresis