Effect of oxyethylene and oxypropylene groups on the interfacial structure and property of extended surfactants: Molecular simulation and experimental study

He, Hongbo; Xiao, Hongyan; Resource, Zhao-Hui Zhou; Zhang, Qun; Gao, Ming; Chen, Xingfeng; Zhang, Lei; Zhang, Lu

doi:10.1016/j.molliq.2023.121944

Cited by 7 publications

(3 citation statements)

References 47 publications

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“…This improved arrangement enhances the temperature and salt resistance properties of the compound system. Additionally, the stable ether linkage between the anionic group and the EO moiety of AEC-9Na significantly enhances the stability of the compound system. , Consequently, the compound system can be used under more demanding conditions.…”

Section: Resultsmentioning

confidence: 99%

Compound Anionic–Nonionic Surfactant System with Excellent Temperature and Salt Resistance for Enhanced Oil Recovery

Li,

Liu,

Jin

et al. 2023

Energy Fuels

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The development of a temperature- and salt-resistant surfactant system is of great significance in enhanced oil recovery. In this study, two anionic–nonionic surfactants, alkylphenol polyoxyethylene ether carboxylate sodium-10Na (APEC-10Na) and fatty alcohol polyoxyethylene ether carboxylate sodium-9Na (AEC-9Na), were applied to construct a compound surfactant system. When the total concentration was 0.3% and the mass ratio of APEC-10Na to AEC-9Na was 7:3, the compound system could reduce the interfacial tension between oil and water to 8.1 × 10–2 mN·m–1, which could be attributed to the dense arrangement of the surfactant molecules in the interface. The system can resist temperatures up to 110 °C and tolerate a monovalent salt concentration of 18 × 104 mg L–1 and a divalent salt concentration of 8 × 103 mg L–1. The compound surfactant system can modify the rock surface wettability from strong hydrophobicity to strong hydrophilicity, with an underwater–oil contact angle reaching 132.4° for the treated rock surface. The oil film peeling rate of the compound system is 73.4%, which is 29.2% higher than that of the commercial system and 41% higher than that of the formation water. The oil recovery rate of the compound system in core displacement experiments is 61.7%, which is 4.8% higher than that of the commercial system and 14% higher than that of the formation water. The compound surfactant system proposed in this work not only achieved low interfacial tension under high-temperature and high-salinity conditions but also realized effective interface wettability regulation, sufficient stripping of adhered oil films, and promotion of oil droplet migration, providing guidance in designing compound surfactant system for the efficient development of high-temperature and high-salinity reservoirs.

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Section: Resultsmentioning

confidence: 99%

Compound Anionic–Nonionic Surfactant System with Excellent Temperature and Salt Resistance for Enhanced Oil Recovery

Li,

Liu,

Jin

et al. 2023

Energy Fuels

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“…This is due to the fact that the combination of surfactants is bound to bring competitive adsorption on the interface. The “flat configuration” of the oxyethylene group in AEC will occupy a certain space size [ 20 , 34 , 35 ], which reduces the number of betaine molecules adsorbed on the oil-water interface to a certain extent, and the dilational modulus will naturally decrease. Compared with AEC, PS has a smaller molecular size, and it will insert adsorption vacancies without affecting the adsorption capacity of betaine, further increasing the tightness of the adsorption film, and the dilational modulus increases.…”

Section: Resultsmentioning

confidence: 99%

The Interfacial Dilational Rheology Properties of Betaine Solutions: Effect of Anionic Surfactant and Polymer

Cui

Cao

et al. 2023

Molecules

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Interfacial dilational rheology is one of the important means to explore the interfacial properties of adsorption films. In this paper, the interfacial rheological properties of the mixed system of sulfobetaine ASB with a linear alkyl group and two anionic surfactants, petroleum sulfonate (PS) and alkyl polyoxyethylene carboxylate (AEC), were investigated by interfacial dilational rheology. The effect of the introduction of polymer hydrophobically modified polyacrylamide (HMPAM) on the interfacial properties of the mixed system was analyzed. In this experiment, the surfactant solution was used as the external phase and n-decane was used as the internal phase. A periodic sinusoidal disturbance of 0.1 Hz was applied to the n-decane droplets, and the changes of parameters such as droplet interfacial tension and interfacial area were monitored in real time with the help of a computer. The results show that the betaine ASB molecule responds to the dilation and compression of the interface through the change of ion head orientation, while the feedback behavior of petroleum sulfonate PS and AEC molecules embedded with oxygen vinyl groups in the molecule is diffusion and exchange between the interface and the bulk phase. Therefore, the interface film formed by ASB alone is higher, and the film formed by PS and AEC molecules alone is relatively lower. After adding two kinds of anionic surfactants to the betaine system, the ionic head of PS or AEC molecules will be attached to the positive center of the hydrophilic group of ASB molecules by electrostatic attraction and no longer adsorb and desorb with the interface deformation. The interfacial rheological properties of the compound system are still dominated by betaine, with higher dilational modulus and lower phase angle. When a small amount of HMPAM is added, or the content of hydrophobic monomer AMPS in the bulk phase is low, the intermolecular interaction at the interface is enhanced, the slow relaxation process is intensified, and the interfacial film strength is increased. As the content of AMPS further increases, hydrophobic blocks and surfactant molecules will form interfacial aggregates similar to mixed micelles at the oil-water interface, which will regulate the properties of the film by affecting the adsorption of surfactants at the interface. As long as the interfacial tension is the same, the properties of the interfacial film are the same. Based on the colloid interface science and the background of enhanced oil recovery, this study provides a reference for the field application of chemical flooding formulations.

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“…Extended surfactants are unique surfactants that contains intermediate polarity groups such as polypropylene oxide (PO) or polypropylene oxide–polyethylene oxide (PO–EO) between the hydrocarbon tail and hydrophilic head group of conventional surfactants [ 1 ]. It is reported that extended surfactants possess better interfacial properties and greater salt and temperature tolerances [ 2 , 3 , 4 ]. Chen and coworkers found that extended surfactants (n-C c P p S), due to both their rugby-shaped molecular geometry and the dynamic amphipathicity of the PPO spacer, behaved with excellent interfacial and solution properties for household cleaning [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Aggregation Behaviors of Oleyl Alcohol-Based Extended Surfactant and Its Mixtures

Li,

Ren,

Wang

et al. 2024

Molecules

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An oleyl alcohol-based extended surfactant, sodium oleyl polyethylene oxide-polypropylene oxide sulfate (OE3P3S), was synthesized and identified using FT-IR and 1H NMR. The adsorption and aggregation behaviors of OE3P3S and its mixture with cationic surfactant alkyltrimethylammoniumbromide (ATAB) were investigated under different molar ratios. The static surface tension analysis indicated that the critical micellization concentration (cmc) and the critical surface tension (γcmc) of OE3P3S were 0.72 mmol/L, and 36.16 mN/m, respectively. The cmc and γcmc values of the binary system were much lower than that of the individual component. And the cmc values of OE3P3S/ATAB = 6:4 mixtures decreased with an increase in the chain length of the cationic surfactant in the binary system. It was found from the dynamic surface tension that there was a slower diffusion rate in the binary system compared to the pure surfactant, and the adsorption processes for OE3P3S/ATAB = 6:4 were mixed diffusion-kinetic adsorption mechanisms. With a combination of DLS data and TEM measurements, formations of vesicles in OE3P3S/ATAB = 6:4 solutions appeared to occur at a concentration of 0.05 mmol/L. By studying the formation of liquid crystal structures in an emulsion prepared with OE3P3S as the surfactant, it was found that the oil-in-water emulsion is birefringent with a Maltese cross texture, and the rheological properties revealed its predominant viscoelastic behavior and shear thinning properties.

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Effect of oxyethylene and oxypropylene groups on the interfacial structure and property of extended surfactants: Molecular simulation and experimental study

Cited by 7 publications

References 47 publications

Compound Anionic–Nonionic Surfactant System with Excellent Temperature and Salt Resistance for Enhanced Oil Recovery

Compound Anionic–Nonionic Surfactant System with Excellent Temperature and Salt Resistance for Enhanced Oil Recovery

The Interfacial Dilational Rheology Properties of Betaine Solutions: Effect of Anionic Surfactant and Polymer

Adsorption and Aggregation Behaviors of Oleyl Alcohol-Based Extended Surfactant and Its Mixtures

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