Hyperbranched poly(amido amine) as an effective demulsifier for oil-in-water emulsions of microdroplets

Zhang, Lifeng; Hao, Ying; Yan, Shu; Zhan, Ningning; Guo, Yihang; Fang, Wenjun

doi:10.1016/j.fuel.2017.09.066

Cited by 67 publications

(23 citation statements)

References 29 publications

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“…The average droplets size increases sharply in the initial few minutes, and then decreases gradually. The interfacial film can be destroyed rapidly under the action of PPDA, and the initiation of the coalescence of large‐sized oil droplets and the average size culminates in the emulsion due to its abundant amino groups . Then, oil‐water separation occurs in the oily wastewater under the action of gravity.…”

Section: Resultsmentioning

confidence: 99%

Treatment of Oily Wastewater Using a Hyperbranched Poly (amido amine) Demulsifier with 1,4‐Phenylene Diamine as Central Core

Zhang

Shen

et al. 2020

ChemistrySelect

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In the present study, a hyperbranched polymer demulsifier (PPDA) was synthesized by an improved “one‐pot” method with 1,4‐phenylene diamine as the central core, and ethylenediamine and methyl acrylate as the chain segments. NMR and Fourier transform infrared spectroscopy were used to confirm the molecular structure of the demulsifier, and thermogravimetric analysis was carried out to estimate its thermal stability. The effects of some important experimental parameters such as concentration, temperature and settling time on the demulsification performance were systematically studied. The results demonstrated that the light transmittance and oil removal ratio of oily wastewater reached to 47.9 % and 93.62 %, respectively, after demulsification with 20 mg.L−1 PPDA for 30 min at room temperature. With the same concentration and time at 60 °C, the light transmittance and oil removal ratio reached 57.0 % and 96.35 %, respectively. In addition, PPDA showed high salt tolerance over 10000 mg.L−1. The possible demulsification mechanism was examined by comparing the demulsification performance of different demulsifiers in diesel emulsion and oily wastewater, respectively. Furthermore, surface tension, interfacial tension, zeta potential and micrograph measurements provided convincing evidence for the possible demulsification mechanism. The surface tension reduction was 29.86 and 31.75 mN.m−1 at 25 °C and 60 °C, respectively. The corresponding critical micelle concentration was 4.17×10−7 and 5.50×10−7 mol.L−1, respectively. Additionally, the interfacial tension decreased from 15.70 to 6.96 mN.m−1 as the PPDA concentration increased from 20 mol. L−1 to 100 mol. L−1. This showed that PPDA easily absorbed at the interface and rapidly permeate into the interface film and then to broke the oil droplets. This work provides a new hyperbranched polymer demulsifier for the treatment of oily wastewater and is beneficial for understanding the demulsification mechanism.

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Section: Resultsmentioning

confidence: 99%

Treatment of Oily Wastewater Using a Hyperbranched Poly (amido amine) Demulsifier with 1,4‐Phenylene Diamine as Central Core

Zhang

Shen

et al. 2020

ChemistrySelect

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“…Other factors such as the branch structure and molecular weight are also important and affect the demulsification performance. For example, Zhang et al . used 1,3‐propanediamine and ethylenediamine as the central cores, respectively, to synthesize two demulsifiers, and the demulsifier with 1,3‐propanediamine as the core showed better performance.…”

Section: Resultsmentioning

confidence: 99%

“…These two demulsifiers exhibited high demulsification efficiencies upon addition into an emulsion with a low oil content. Subsequently, Zhang et al . used a new “one‐pot” method to synthesize polyamide amine demulsifiers.…”

Section: Introductionmentioning

confidence: 99%

Demulsification of oil‐in‐water emulsions using hyperbranched poly(amido amine) demulsifiers with 4,4‐diaminodiphenyl methane as initial cores

Kuang

Jiang

et al. 2019

J of Applied Polymer Sci

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Hyperbranched poly(amido amine) demulsifier (PDDM) was synthesized by a modified “one‐pot” method with 4,4‐diaminodiphenyl methane as the central core and ethylenediamine as the interior branches. The structure of the demulsifier was confirmed by proton nuclear magnetic resonance and Fourier transform infrared. The effects of the temperature and PDDM concentration on the demulsification performance were investigated, and PDDM performance was compared to that of the hyperbranched demulsifier with 1,3‐propanediamine as the central core. When the emulsions were treated with the demulsifier concentration of 50 mg L−1 at 60 °C for 120 min, the light transmittance and removed total organic content of the aqueous phase reached 87.4 and 99.72%, respectively. At the optimal demulsification temperature of 60 °C, the surface tension reduction and the critical micelle concentration were 27.38 mN m−1 and 1.30 × 10−3 mol L−1, respectively. The combination of surface tension and interfacial tension measurements and the analysis of micrographs and particles sizes provide evidence for the possible demulsification mechanism. The excellent demulsification performance of the hyperbranched demulsifier indicates that it has great potential for use in the demulsification of oil‐in‐water emulsions. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48846.

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“…Zhang et al [ 19 ] used a polyamide-amine dendrimer demulsifier to study the effect of the hydrophobic chain on interfacial properties and demulsification with molecular dynamics simulation technology. The results show that with the increase in the demulsifier concentration, the kinetic parameters n and t* obtained by characterizing the molecular diffusion rate decreased.…”

Section: Introductionmentioning

confidence: 99%

Screening and Demulsification Mechanism of Fluorinated Demulsifier Based on Molecular Dynamics Simulation

Geng

Zhang

et al. 2022

Molecules

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In order to solve the problem of demulsification difficulties in Liaohe Oilfield, 24 kinds of demulsifiers were screened by using the interface generation energy (IFE) module in the molecular dynamics simulation software Materials Studio to determine the ability of demulsifier molecules to reduce the total energy of the oil–water interface after entering the oil–water interface. Neural network analysis (NNA) and genetic function approximation (GFA) were used as technical means to predict the demulsification effect of the Liaohe crude oil demulsifier. The simulation results show that the SDJ9927 demulsifier with ethylene oxide (EO) and propylene oxide (PO) values of 21 (EO) and 44 (PO) reduced the total energy and interfacial tension of the oil–water interface to the greatest extent, and the interfacial formation energy reached -640.48 Kcal/mol. NNA predicted that the water removal amount of the SDJ9927 demulsifier was 7.21 mL, with an overall error of less than 1.83. GFA predicted that the water removal amount of the SDJ9927 demulsifier was 7.41mL, with an overall error of less than 0.9. The predicted results are consistent with the experimental screening results. SDJ9927 had the highest water removal rate and the best demulsification effect. NNA and GFA had high correlation coefficients, and their R2s were 0.802 and 0.861, respectively. The higher R2 was, the more accurate the prediction accuracy was. Finally, the demulsification mechanism of the interfacial film breaking due to the collision of fluorinated polyether demulsifiers was studied. It was found that the carbon–fluorine chain had high surface activity and high stability, which could protect the carbon–carbon bond in the demulsifier molecules to ensure that there was no re-emulsion due to the stirring external force.

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Hyperbranched poly(amido amine) as an effective demulsifier for oil-in-water emulsions of microdroplets

Cited by 67 publications

References 29 publications

Treatment of Oily Wastewater Using a Hyperbranched Poly (amido amine) Demulsifier with 1,4‐Phenylene Diamine as Central Core

Treatment of Oily Wastewater Using a Hyperbranched Poly (amido amine) Demulsifier with 1,4‐Phenylene Diamine as Central Core

Demulsification of oil‐in‐water emulsions using hyperbranched poly(amido amine) demulsifiers with 4,4‐diaminodiphenyl methane as initial cores

Screening and Demulsification Mechanism of Fluorinated Demulsifier Based on Molecular Dynamics Simulation

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