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The Demulsification Properties of Cationic Hyperbranched Polyamidoamines for Polymer Flooding Emulsions and Microemulsions

by Yangang Bi 1,2, Zhi Tan 1,2, Liang Wang 1,2,*, Wusong Li 1,2,*, Congcong Liu 1,2, Zhantao Wang 1,2, Xiangchen Liu 1,2,* and Xinru Jia 2,3,*
1
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, Linyi University, Linyi 276000, China
2
International Dendritic and Hyperbranched Polymers Innovation and Application Center, Weihai JinHong Group Co. Ltd., Weihai 264211, China
3
Beijing National Laboratory for Molecular Sciences, and Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
*
Authors to whom correspondence should be addressed.
Processes 2020, 8(2), 176; https://doi.org/10.3390/pr8020176
Received: 4 January 2020 / Revised: 24 January 2020 / Accepted: 29 January 2020 / Published: 4 February 2020
(This article belongs to the Special Issue Design and Applications of Polymeric Flocculants)
Polymer flooding emulsions and microemulsions caused by tertiary oil recovery technologies are harmful to the environment due to their excellent stability. Two cationic hyperbranched polyamidoamines (H-PAMAM), named as H-PAMAM-HA and H-PAMAM-ETA, were obtained by changing the terminal denotation agents to H-PAMAM, which was characterized by 1H NMR, FT-IR, and amine possession, thereby confirmed the modification. Samples (300 mg/L) were added to the polymer flooding emulsion (1500 mg/L oil concentration) at 30 °C for 30 min and the H-PAMAM-HA and H-PAMAM-ETA were shown to perform at 88% and 91% deoil efficiency. Additionally, the increased settling time and the raised temperature enhanced performance. For example, an oil removal ratio of 97.7% was observed after dealing with the emulsion for 30 min at 60 °C, while 98.5% deoil efficiency was obtained after 90 min at 45 °C for the 300 mg/L H-PAMAM-ETA. To determine the differences when dealing with the emulsion, the interfacial tension, ζ potential, and turbidity measurements were fully estimated. Moreover, diametrically different demulsification mechanisms were found when the samples were utilized to treat the microemulsion. The modified demulsifiers showed excellent demulsification efficiency via their obvious electroneutralization and bridge functions, while the H-PAMAM appeared to enhance the stability of the microemulsion.
Keywords: cationic hyperbranched polymers; demulsifiers; polymer-flooding emulsion; microemulsion; interfacial tension; turbidity cationic hyperbranched polymers; demulsifiers; polymer-flooding emulsion; microemulsion; interfacial tension; turbidity
MDPI and ACS Style

Bi, Y.; Tan, Z.; Wang, L.; Li, W.; Liu, C.; Wang, Z.; Liu, X.; Jia, X. The Demulsification Properties of Cationic Hyperbranched Polyamidoamines for Polymer Flooding Emulsions and Microemulsions. Processes 2020, 8, 176.

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