Fast demulsification of oil-water emulsions at room temperature by functionalized magnetic nanoparticles

Zhou, Jingjing; Ma, Jun; Li, Xingang; Al-Shiaani, Nabil. H.A.; He, Lin

doi:10.1016/j.seppur.2021.118967

Cited by 51 publications

(16 citation statements)

References 66 publications

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“…As a result, poor demulsification performance is usually observed for a majority of superhydrophobic MNPs, although a breakthrough was reported on using superhydrophobic spiky particles. 12 Amphiphilic MNPs can be well dispersed in the aqueous phase, and majority of them will assemble at the oil droplet surface because of their good interfacial activity; 13 accordingly, the MNP-coated oil droplets can be rapidly separated from the water phase under a magnetic field. For example, the MNPs coated with graphene oxide, 14 poly(N-isopropylacrylamide), 15 polyvinylpyrrolidone, 16 cyclodextrin, 17 or bacteria 18 exhibited good interfacial activity and superior emulsified oil separation performance.…”

Section: ■ Introductionmentioning

confidence: 99%

Demulsification Performance and Mechanism of Tertiary Amine Polymer-Grafted Magnetic Nanoparticles in Surfactant-Free Oil-in-Water Emulsion

Lü

Zhou

et al. 2023

Langmuir

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Numerous cationic magnetic nanoparticles (MNPs) have previously been developed for demulsifying oil-in-water (O/ W) emulsion, and results showed that the cationic MNPs could effectively flocculate and remove the negatively charged oil droplets via charge attraction; however, to the best of our knowledge, there are no research reports regarding the synergetic influence of both the positive charge density and interfacial activity of MNPs on the demulsification performance. In this study, three tertiary amine polymer-grafted MNPs, namely, poly(2-dimethylaminoethyl acrylate)-grafted MNPs (M-PDMAEA), poly(2dimethylamino)ethyl methacrylate)-grafted MNPs (M-PDMAE-MA), and poly(2-diethylaminoethyl methacrylate)-grafted MNPs (M-PDEAEMA), were synthesized and evaluated for their demulsification performance. Results demonstrated that a high positive charge density and superior interfacial activity of MNPs could cause partial oil droplet re-dispersion when excessive MNPs were introduced, leading to a lower magnetic separation efficiency and narrower demulsification window. Herein, a demulsification window is defined as a range of nanoparticle dosages in which the MNPs can effectively demulsify the O/W emulsion under certain conditions. For highly positively charged MNPs, their good interfacial activity could aggravate the formation of a narrower demulsification window. When tertiary amine polymer-grafted MNPs carried a lower positive charge density or weak interfacial activity, that is, M-PDMAEA at pH 4.0, M-PDMAEMA at pH 5.0−9.0, and M-PDEAEMA at pH 9.0−10.0, wide demulsification windows were observed. Additionally, a recycling experiment suggested that MNPs could maintain high demulsification efficiency up to at least five cycles, indicating their satisfactory recyclability. The three tertiary amine polymer-grafted MNPs can be potentially used for efficient demulsification from surfactant-free O/W emulsion in various pH ranges.

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Section: ■ Introductionmentioning

confidence: 99%

Demulsification Performance and Mechanism of Tertiary Amine Polymer-Grafted Magnetic Nanoparticles in Surfactant-Free Oil-in-Water Emulsion

Lü

Zhou

et al. 2023

Langmuir

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“…2 On the other hand, the inorganic salts in water phase would cause the corrosion of pipelines and equipment during the oil transportation process, and increase the risks of catalyst poisoning during the downstream oil refinery process. 3 Therefore, it is of great significance to separate the oilwater emulsions. 4 Chemical demulsification is increasingly utilized in the oil fields because of its high efficiency and low cost.…”

Section: Introductionmentioning

confidence: 99%

Demulsification of W/O emulsions using highly branched polymer demulsifier with 2,6‐naphthalenedicarboxylate as centronucleus

Zhang

Ai³

et al. 2023

J of Applied Polymer Sci

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A highly branched PNDC demulsifier with 2,6-naphthalenedicarboxylate as centronucleus was prepared by an efficient "one-pot" strategy. The product was characterized by FT-IR, 1 H-NMR, and TGA. The bottle test was performed to explore the effect of temperature, settling time, pH value, and concentration on the demulsification efficiency (DE). The DE reached an optimal value of 94.63% when the concentration of PNDC, settling time and operated temperature were 100 mg/L, 60 min and 70 C, respectively. Also, the DE could reach 91.58% when the concentration was only 20 mg/L at the same conditions. It showed that PNDC had an excellent performance in W/O emulsions with an extremely low concentration. Especially, PNDC could be used over a wide pH range (4-12) and high salinities, indicating that it had a good salt, acid and alkaline tolerance. In addition, the interfacial tension (IFT), surface tension (SFT), elastic modulus and micrograph analysis were carried out to investigate the possible mechanism. This work provides a highly branched demulsifier with high DE for the demulsification of stable W/O emulsions.

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“…[22] As of now, there are many types of chemical demulsifiers, such as polyether, [23] ionic liquids, [24] siloxane, [25] nano composites, [26] hyperbranched polymer, [27] biode-mulsifiers, [28] and magnetic nanoparticles. [29] These synthetic demulsifiers can accelerate the aggregation of oil droplets by destroying the original interfacial film, so that the oil and water are separated to achieve the effect of demulsification. Among these demulsifiers, although demulsifiers like ionic liquids and magnetic nanoparticles have broad application prospects, further research is needed.…”

Section: Introductionmentioning

confidence: 99%

“…In comparison to other methods, chemical demulsification is more convenient and effective [22] . As of now, there are many types of chemical demulsifiers, such as polyether, [23] ionic liquids, [24] siloxane, [25] nano composites, [26] hyperbranched polymer, [27] biode‐mulsifiers, [28] and magnetic nanoparticles [29] . These synthetic demulsifiers can accelerate the aggregation of oil droplets by destroying the original interfacial film, so that the oil and water are separated to achieve the effect of demulsification.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Research of Highly Efficient Polyether Demulsifier

2022

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Separation of oil and water has always been a top priority in the oil industry. In this study, bisphenol A phenolamine resin (BPA) was synthesized from bisphenol A, diethylenetriamine and formaldehyde. With KOH as a catalyst, the initiator, ethylene oxide (EO) and propylene oxide (PO) were polycondensed into triblock polyethers with different molecular weights, and then crosslinked to increase the molecular weight. The target product was determined by 1 HNMR and FT-IR, and the synthesis process of triblock polyether demulsifier was optimized by changing the ratio of initiator to head PO, PO to EO and head PO to tail PO. Then, the important influential factors for the demulsification such as the demulsifier concentration, standing time, temperature, pH and Hydrophile-lip-ophile balance (HLB) values were investigated. The results suggestted that the optimal synthesis ratio of BPA type triblock polyether demulsifier was as follows: initiator/PO = 1 : 109, PO/ EO = 2 : 1, head PO/ tail PO = 1 : 3. Under demulsification conditions, the dehydration temperature was 50 °C, the dosage was 75 mg ⋅ L À 1 , pH was 7.6 and HLB was 9.1, and the dehydration rate reached 92.5 % in 90 minutes. Compared with the existing demulsifier, the demulsifier has a lower demulsification temperature and higher demulsification efficiency. Therefore, it can be concluded that the polyether demulsifier has potential application for the crude oil dehydration, and the current work may be helpful to explore the demulsification development.

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Fast demulsification of oil-water emulsions at room temperature by functionalized magnetic nanoparticles

Cited by 51 publications

References 66 publications

Demulsification Performance and Mechanism of Tertiary Amine Polymer-Grafted Magnetic Nanoparticles in Surfactant-Free Oil-in-Water Emulsion

Demulsification Performance and Mechanism of Tertiary Amine Polymer-Grafted Magnetic Nanoparticles in Surfactant-Free Oil-in-Water Emulsion

Demulsification of W/O emulsions using highly branched polymer demulsifier with 2,6‐naphthalenedicarboxylate as centronucleus

Synthesis and Research of Highly Efficient Polyether Demulsifier

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