Synthesis and properties of novel branched polyether as demulsifiers for polymer flooding

Li, Zhongwei; Yin, Shuo; Tan, Guangyuan; Zhao, Shile; Shi, Zhengyang; Jing, Bo; Zhai, Lipeng; Tan, Yebang

doi:10.1007/s00396-016-3956-x

Cited by 35 publications

(23 citation statements)

References 76 publications

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“…As shown in Table , the γ CMC values were found to be 44.90, 43.52, 41.60 and 40.05 mN.m −1 at 298, 313, 323 and 333 K, respectively. This shows that the critical micelle concentration decreases dramatically with increasing temperature, suggesting that the temperature can promote the adsorption of the demulsifier at the oil/water interface and enhance the micellization in the aqueous solution . The average molecular weight (M w =20878) and polydispersity index (PDI=5.09) of PPDA were obtained by gel permeation chromatography (GPC).…”

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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“…The surface activity parameters such as the maximum surface excess concentration (Γ max ), minimum surface area per molecule (A min ), and surface tension reduction (π cmc ) mean the extent of the reduction in the surface tension . The data presented in Table show the surface‐active and thermodynamic parameters for the as‐prepared PDDM.…”

Section: Resultsmentioning

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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“…When the temperature is elevated enough to cause a change of the solution from clear to turbid, the intersection is taken as the cloud point. 22,23 Figure 3a demonstrates the temperature dependence of turbidity. For DP, a linear-ship appears between its turbidity and temperature in the experimental range, and thus, no cloud point is found.…”

Section: Resultsmentioning

confidence: 99%

Practical Modification of Tannic Acid Polyether Demulsifier and Its Highly Efficient Demulsification for Water-in-Aging Crude Oil Emulsions

Liu

et al. 2019

ACS Omega

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In order to break the aging crude oil (WACO) emulsion of the offshore platform more effectively, a highly active isocyanate, polyaryl polymethylene isocyanate (PAPI), was selected to modify the pilot-scale tannic acid demulsifier. In the addition of PAPI, its molecular weight and viscosity dramatically increased, while its relative solubility, hydroxyl number, and cloud point exhibited an opposite direction, showing an increase in hydrophobicity. After adding the above modified demulsifier, a remarkably improved water removal of WACO emulsion accompanied by a notable reduction of the water content in the oil phase monitored by the Karl Fischer method was observed. Demulsification on the offshore platform demonstrated that the best water removal was achieved when the proportion of PAPI is 1.5 wt %. Its demulsification efficiency reached 95.7%, which was 25.6% higher than the 76.2% of unmodified demulsifier. In addition, a positive correlation between viscoelasticity of emulsion and demulsification performance was found by only adjusting the parameters of the rheometer. This method may be utilized to characterize the demulsification performance by any rotary rheometer. The pilot-scale demulsification experiment demonstrated that the water removal can reach 98.14 vol % and residual water content was only 0.55 vol %. These results further confirmed the excellent demulsification performance of the modified demulsifier toward the WACO emulsion in production.

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Synthesis and properties of novel branched polyether as demulsifiers for polymer flooding

Cited by 35 publications

References 76 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

Practical Modification of Tannic Acid Polyether Demulsifier and Its Highly Efficient Demulsification for Water-in-Aging Crude Oil Emulsions

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