A comprehensive review on the behavior and evolution of oil droplets during oil/water separation by membranes

Zhang, Jialü; Peng, Kaiming; Xu, Zhi‐Kang; Xiong, Yongjiao; Liu, Jia; Cai, Chen; Huang, Xin

doi:10.1016/j.cis.2023.102971

Cited by 36 publications

(4 citation statements)

References 231 publications

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“…In recent years, a variety of new materials are emerging for efficient oil–water separation. − The current methods employed include gravity separation, biodegradation, centrifugation, and membrane filtration . Each of them has its set of advantages and limitations.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characteristics of Smart Coating Materials for Reversible Double Stimulus-Responsive Oil–Water Separation

Zhang,

Wang,

Qiu

et al. 2024

ACS Appl. Polym. Mater.

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The developed smart coating for water−oil separation, characterized by its mild separation conditions, ease of control, and absence of secondary pollution, holds promising potential for applications in controlled liquid transmission, oil−water separation, smart textiles, and biosensing films. This work focused on synthesizing copolymers that respond to both photon and pH stimuli. Initially, 4-trifluoromethoxy-4′-methacryloxyazobenzene (FMAB) and similar monomers, serving as photon-responsive units with varying carbon chain lengths, were synthesized using different synthetic routes. Such a design approach also aimed to enhance the hydrophobic characteristics of the photoresponsive segments to a certain degree. Theoretically, the impact of the carbonyl position on nucleophilic substitution reactions was investigated through density functional theory (DFT) calculations. These monomers were subsequently copolymerized individually with dimethylaminoethyl methacrylate (DMAEMA), which acts as a pH-responsive unit, using the reversible addition−fragmentation chain transfer (RAFT) technique in a one-step copolymerization process. The polymers were subsequently coated onto glass slides to form films, the contact angles of which could be modulated in response to both light and pH stimuli. To be highlighted, the maximum contact angle change can reach 131°under double stimulation. To ultimately showcase its oil−water separation capabilities, the polymer was combined with a nonwoven fabric to create a membrane. This membrane is capable of reversibly transitioning between hydrophilic−lipophobic and hydrophobic− lipophilic states, demonstrating substantial potential for future advancements in efficient water−oil separation.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characteristics of Smart Coating Materials for Reversible Double Stimulus-Responsive Oil–Water Separation

Zhang,

Wang,

Qiu

et al. 2024

ACS Appl. Polym. Mater.

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“…The ions and pH value of the formation water also change the time of oil droplet coalescence [21]. More research has mostly investigated the separation effect of emulsions from the standpoint of the oil-water separation mode [22][23][24]. In our previous work, molecular dynamics simulation and microscope observation experiments studied the stability of different surfactant emulsions in the demulsification process and the microscopic mechanism of molecules in the oil film [25,26].…”

Section: Introductionmentioning

confidence: 99%

Unstable Coalescence Mechanism and Influencing Factors of Heterogeneous Oil Droplets

Li,

Huang,

et al. 2024

Molecules

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The use of a surfactant solution during oil and gas field development might improve the recovery rate of oil reservoirs. However, the serious emulsification of the produced liquid will bring challenges to the subsequent treatment process and storage and transportation. It is urgent to understand the coalescence mechanism of crude oil under the action of surfactant solution. This research investigates the coalescence mechanism of numerous oil droplets under liquid flow perturbation. The model was established to study the coalescence process of multiple oil droplets. The effects of the number of oil droplets under homogeneous conditions, the size of oil droplets, and the distance between oil droplets under non-homogeneous conditions on the coalescence process were analyzed. Meanwhile, the change rules of the completion time of oil droplet coalescence were drawn. The results show that the smaller the size of individual oil droplets under non-homogeneous conditions, the longer the coalescence completion time is, and when the size of individual oil droplets reaches the nanometer scale, the time for coalescence of oil droplets is dramatically prolonged. Compared to static circumstances, the time it takes for oil droplets to coalesce is somewhat shorter under gravity. In the fluid flow process, in the laminar flow zone, the coalescence time of oil droplets decreases with the increase of the liquid flow rate. However, in the turbulent flow zone, the coalescence time of oil droplets increases with the increase in the liquid flow rate. The coalescence time is in the range of 600~1000 ms in the flow rate of 0.05~0.2 m/s. In the presence of surfactants, the oil content in the emulsion system increases under the influence of pumping flow. The change in oil content rate with various surfactants is less impacted by flow rate, owing to the stable emulsion structure created by the extracted fluid within the reservoir. The study findings presented in this research provide technical assistance for effective crude oil storage and transportation.

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“…According to the pore size, membranes can be divided into microfiltration membrane (MF), ultrafiltration membrane (UF), nanofiltration membrane (NF), and reverse osmosis membrane (RO), etc. Membrane separation includes staggered dynamic filtration or dead-end filtration [11]. Scholars are more focused on membrane separation technology in comparison to traditional oil-water separation methods, owing to its notable advantages such as excellent separation efficiency, minimal power consumption, and ease of handling [12].…”

Section: Introductionmentioning

confidence: 99%

Mussel-Inspired Construction of Silica-Decorated Ceramic Membranes for Oil–Water Separation

Zhou,

Chang,

et al. 2024

Ceramics

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In recent years, ceramic membranes have received widespread focus in the area of liquid separation because of their high permeability, strong hydrophilicity, and good chemical stability. However, in practical applications, the surface of ceramic membranes is prone to be contaminated, which degrades the permeation flux of ceramic membranes during the separation process. Inspired by mussels, we imitate the biomimetic mineralization process to prepare a ceramic membrane of nano–silica on the pre-modified zirconia surface by co-deposited polydopamine/polyethyleneimine. The modified ceramic membranes were utilized for the purpose of oil–water separation. Separation performance has been tested using a disc ceramic membrane dynamic filtration device. The outcomes revealed an enhanced permeability in the modified membrane, measuring as 159 L m−2 h−1 bar−1, surpassing the separation flux of the unmodified membrane, which was 104 L m−2 h−1 bar−1. The permeation performance of the modified membrane was increased to 1.5 times. Modified ceramic membranes are highly resistant to fouling. From the beginning to the end of separation process, the oil rejection rate of the modified ceramic membrane is always higher than 99%. After a 2 h oil–water separation test run, modified ceramic membrane permeate flux can be restored to 91% after cleaning. It has an enormous capacity for application in the area of oil–water separation.

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A comprehensive review on the behavior and evolution of oil droplets during oil/water separation by membranes

Cited by 36 publications

References 231 publications

Synthesis and Characteristics of Smart Coating Materials for Reversible Double Stimulus-Responsive Oil–Water Separation

Synthesis and Characteristics of Smart Coating Materials for Reversible Double Stimulus-Responsive Oil–Water Separation

Unstable Coalescence Mechanism and Influencing Factors of Heterogeneous Oil Droplets

Mussel-Inspired Construction of Silica-Decorated Ceramic Membranes for Oil–Water Separation

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