Modified Hyperbranched Polyethylenimine as a Novel Demulsifier for Oil-in-Water Emulsions

Teng, Houkai; Chen, Cuiting; Yan, Shu; Ye, Dengfeng; Zhang, Lifeng

doi:10.1021/acs.energyfuels.9b01542

Cited by 28 publications

(13 citation statements)

References 40 publications

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“…It can be observed that new peaks appear at 1515, 1619, and 3336 cm −1 , corresponding to the absorption peaks of NH, C═C and OH in dopamine, respectively 33 . Meanwhile, the absorption peaks of CH 2 on alkane chain appeared at 2923 cm −1 and the absorption peak of CONH at 1642 cm −1 20 . Thus, it can be proved that CHPEI was grafted to PVDF membranes.…”

Section: Resultsmentioning

confidence: 79%

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Application of polyvinylidene fluoride membrane with demulsification property in oil–water separation

Yang

Han

Yan

2022

J of Applied Polymer Sci

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Membrane‐based treatment for demulsification remains a significant challenge due to membrane fouling. In this work, the demulsification and membrane separation technology were combined to design polyvinylidene fluoride (PVDF) membrane with demulsification function. The hyperbranched polyethyleneimine was prepared by the acyl chloride reaction and grafted on the PVDF membrane by dopamine. The effects of different amounts of hyperbranched polyethyleneimine on PVDF membrane were studied. The modified membrane was characterized by SEM, CA, FTIR, and XPS, and then the optimum preparation conditions were selected. The separation test shows that the modified membrane can be used to separate oil‐in‐water emulsions and the separation efficiency was more than 90%, meanwhile it showed good anti‐pollution performance owing to the water‐based protective layer on the membrane surface and the steric effect of the branches. In addition, the demulsification mechanism was analyzed and it was found that the surface tension was the key point for demulsification.

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Section: Resultsmentioning

confidence: 79%

“…The chemical shift is 0.91 ppm which can be ascribed as the triplet hydrogen proton peak of the methyl group on the aliphatic chain. It can be concluded that palmitoyl chloride was grafted to the HPEI 20 …”

Section: Resultsmentioning

confidence: 99%

Application of polyvinylidene fluoride membrane with demulsification property in oil–water separation

Yang

Han

Yan

2022

J of Applied Polymer Sci

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“…When the demulsi er migrate to the oil-water interface, the demulsi er will destroy the protective lm by strong adsorption with asphaltene and resin through π-π or n-π interactions (Liu et al 2015b). Subsequently, small droplets can occulate and coalescence to form the large droplets, and the oil and water can eventually be quickly separated under the gravity eld (Teng et al 2019).…”

Section: Possible Demulsifying Mechanismmentioning

confidence: 99%

Nanoscale Silica Coated Graphene Oxide and Its Demulsifying Performance in Water-in-oil and Oil-in-water Emulsions

Shen

Lei³

et al. 2021

Preprint

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In present study, GO@SiO2 nanocomposites was prepared by coating nanoscale silica onto graphene oxide (GO). The nanocomposites were characterized with scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (IF-IR). Additionally, the demulsifying performance of the nanocomposites was investigated by the bottle test method. The results showed that GO@SiO2 nanocomposites had a good demulsifying performance both in oil-in-water (O/W) and water-in-oil (W/O) emulsions. When the concentration of GO@SiO2 was 200 ppm in O/W emulsion, the optimal light transmittance of aqueous phase (LTA) and corresponding oil removal rate (ORR) at room temperature could reach 86.9% and 99.48%, respectively. Also, GO@SiO2 had an excellent salt tolerance under acidic condition. Furthermore, GO@SiO2 nanocomposites also could demulsify the W/O emulsion, and the efficiency at 70℃ could reach 80.5% when the concentration was 400 ppm.

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“…This problem is faced by numerous countries worldwide 10–12 . Therefore, reverse demulsifier becomes particularly important for the produced liquid treatment 13,14 . During the produced liquid treatment process, the reverse demulsifier is added to the three‐phase separator to promote the O/W emulsion separation 15,16 .…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12] Therefore, reverse demulsifier becomes particularly important for the produced liquid treatment. 13,14 During the produced liquid treatment process, the reverse demulsifier is added to the three-phase separator to promote the O/W emulsion separation. 15,16 A favorable reverse demulsifier can relieve the load of treatment equipment and is helpful for the treated wastewater to meet the reinjection standard easily.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a novel reverse demulsifier with the characteristics of polyacrylate and polycation and its demulsification performance

Wang

Fang

Wang

et al. 2021

J of Applied Polymer Sci

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As the development of oilfield exploitation, more and more oil in water (O/W) emulsion was produced, thus efficient reverse demulsifier becomes increasingly important. In this paper, a series of novel reverse demulsifiers (R‐PED1 ~ 4) with the characteristics of polyacrylate and polycation were prepared. The structure of the product was verified by IR specter and 1H NMR. The thermal stability was studied with TGA and the molecular weight was obtained by GPC. Field evaluation results showed that the oil content in produced liquid after R‐PED4 treatment can be reduced from 1550 to 81 mg/L at R‐PED4 dosage was 50 mg/L. Furthermore, the demulsification mechanism of R‐PED was discussed. The R‐PED has good surface/interfacial activity. It can effectively reduce the oil–water interfacial film strength and reduce the zeta potential of oil droplets, which is beneficial for the coalescence of oil droplets. Especially, the interaction force between oil droplets was measured by the optical tweezers. R‐PED4 can increase the attraction force between oil droplets. Consequently, the contact time of oil droplets during the demulsification process can be prolonged and the coalescence of oil droplets also can be effectively promoted. The novel reverse demulsifier offers a new option for the oilfield produced liquid treatment.

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Modified Hyperbranched Polyethylenimine as a Novel Demulsifier for Oil-in-Water Emulsions

Cited by 28 publications

References 40 publications

Application of polyvinylidene fluoride membrane with demulsification property in oil–water separation

Application of polyvinylidene fluoride membrane with demulsification property in oil–water separation

Nanoscale Silica Coated Graphene Oxide and Its Demulsifying Performance in Water-in-oil and Oil-in-water Emulsions

Synthesis of a novel reverse demulsifier with the characteristics of polyacrylate and polycation and its demulsification performance

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