Study of the molecular array behaviour of laurel alkanolamide at the oil–water interface and the high interfacial activity enhanced by an inherent synergistic effect

RSC Advances ◽  
2014 ◽  
Vol 4 (79) ◽  
pp. 41831-41837 ◽  
Author(s):  
Sen Zhang ◽  
Pengfei Zhu ◽  
Yange Sun ◽  
Yong Yang ◽  
Xulong Cao ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Interface Layer ◽  
Water Molecules ◽  
Water Interface ◽  
Interfacial Activity ◽  
Oil Water

Intricate H-bonds network existed between alkanolamide and water molecules in oil–water interface layer, which laid the foundation for the high interfacial density and high interfacial efficiency of alkanolamide at the oil–water interface.

Research and Application of a New Demulsifier for the Processing of Produced Liquid in Chanqing Gasfield

2020 ◽  
Vol 991 ◽  
pp. 166-171
Author(s):  
Shi Jun Chen ◽  
Fan Tang ◽  
Wei Tian ◽  
Qiao Na Liu ◽  
Gang Chen
Keyword(s):  
Synergistic Effect ◽  
Oil Field ◽  
Test Method ◽  
Effect Of Temperature ◽  
Water Interface ◽  
The Poor ◽  
Bottle Test ◽  
Oil Water ◽  
Demulsification Efficiency

In view of the serious emulsification existing in Changqing condensate gas emulsion, the unclear oil-water interface and the poor application effect of demulsifier used in the field, it is urgent to study an efficient demulsifier. In this paper, PM and XP-1221 two kinds of demulsifiers are used to solve the emulsification problem. The PM demulsifier was compounded with XP-1221 chemical demulsifier to solve the emulsification problem of Changqing condensate. The effect of temperature and demulsifier concentration on demulsification performance was studied by bottle test method. The results showed that XP-1221 and PM could be effectively combined. The demulsification efficiency was high and the dehydrated water was clear. Studies have shown that XP-1221 has a good synergistic effect with PM. The suitable ratio of the composite demulsifier is 1:1, and the demulsifier effect of the demulsifier can meet the requirements of the oil field demulsifier. The composite demulsifier can meet the requirements of current oilfield demulsifiers.

scholarly journals Molecular Dynamics Simulation of Distribution and Diffusion Behaviour of Oil–Water Interfaces

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1905 ◽  
Author(s):  
Chengbin Zhang ◽  
Hanhui Dai ◽  
Pengfei Lu ◽  
Liangyu Wu ◽  
Bo Zhou ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Interface Roughness ◽  
Dynamics Simulation ◽  
Water Phase ◽  
Water Molecules ◽  
Water Interface ◽  
Oil Water ◽  
And Diffusion ◽  
Diffusion Behaviors

The distribution and diffusion behaviors of microscopic particles at fluorobenzene–water and pentanol–water interfaces are investigated using molecular dynamics simulation. The influences of Na+/Cl− ions and the steric effects of organic molecules are examined. The concentration distributions of different species, the orientations of oil molecules at the interface, and oil–water interface morphology as well as the diffusion behaviors of water molecules are explored and analyzed. The results indicate that a few fluorobenzene molecules move into the water phase influenced by Na+/Cl− ions, while the pentanol molecules at the interface prefer orientating their hydrophilic groups toward the water phase due to their large size. The water molecules more easily burst into the pentanol phase with larger molecular spaces. As the concentration of ions in the water phase increases, more water molecules enter into the pentanol molecules, leading to larger interface roughness and interface thickness. In addition, a lower diffusion coefficient for water molecules at the fluorobenzene–water interface are observed when introducing Na+/Cl− ions in the water phase, while for the pentanol–water system, the mobility of interfacial water molecules are enhanced with less ions and inhibited with more ions.

Interfacial Activity of Starch-Based Nanoparticles at the Oil–Water Interface

Langmuir ◽  
2017 ◽  
Vol 33 (15) ◽  
pp. 3787-3793 ◽  
Author(s):  
Xiaopeng Pei ◽  
Kankan Zhai ◽  
Xuechen Liang ◽  
Yukun Deng ◽  
Ying Tan ◽  
...  
Keyword(s):  
Water Interface ◽  
Interfacial Activity ◽  
Oil Water

scholarly journals Partitioning Behavior and Interfacial Activity of Phenolic Acid Derivatives and their Impact on β-Lactoglobulin at the Oil-Water Interface

2021 ◽  
Author(s):  
Alina Bock ◽  
Ulrike Steinhäuser ◽  
Stephan Drusch
Keyword(s):  
Phenolic Compounds ◽  
Aqueous Phase ◽  
Phenolic Acid ◽  
Water Interface ◽  
Interfacial Behavior ◽  
Protein Film ◽  
Interfacial Activity ◽  
Oil Water ◽  
Phenolic Acid Derivatives ◽  
Partitioning Behavior

AbstractProteins are able to stabilize dispersed food systems due to their amphiphilic nature, acting as emulsifiers. Their interfacial properties can be influenced by different methods, including the formation of protein-phenol nanocomplexes. In this study, the interfacial behavior of phenolic compounds and protein-phenol nanocomplexes was first characterized according to the oil-water partitioning behavior of phenolic acid derivatives according to their molecular structure and its impact on interfacial tension. The influence of the phenolic compounds on protein film formation and its properties by dilatational rheology was then evaluated. The most phenolic acid derivatives are predominantly present in the aqueous phase. Despite their hydrophobic benzene body, weak interfacial activity was observed depending on their chemical structure. This result supports possible protein-phenol nanocomplex formation in the aqueous phase and possible interactions at the oil-water interface. Protein-phenol nanocomplexes showed decreased interfacial adsorption properties and decreased viscoelastic interfacial behavior, depending on the expansion of the delocalized π-electrons in the phenol.

scholarly journals The Influence of Some Interfacial Properties of PEO-b-PPO Copolymers on Dewatering of Water-in-Oil Asphaltene Model Emulsions

2009 ◽  
Vol 3 (1) ◽  
pp. 53-58
Author(s):  
Joao Batista Ramalho ◽  
◽  
Natalie Ramos ◽  
Elizabete Lucas ◽  
◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Water Interface ◽  
Molecular Area ◽  
Interfacial Activity ◽  
Surfactant Solutions ◽  
Interfacial Concentration ◽  
Poly Ethylene Oxide ◽  
Oil Water ◽  
Poly Ethylene ◽  
Oil Emulsions

Three different macromolecular structures of poly(ethylene oxide-b-propylene oxide) copolymers, used in formulations of commercial demulsifiers for breaking water-in-crude oil emulsions, were investigated. The interfacial activity (), the lower interfacial tension (m), the critical micelle concentration (CMC), the interfacial concentration (Γ) and the molecular area (A) adsorbed at the interface of the surfactant solutions were evaluated. These results were correlated to surfactant performance in coalescing three different asphaltene model emulsions. The PEO-b-PPO commercial demulsifiers, that were capable to dewater asphaltene model emulsions, exhibited interfacial activity to the oil-water interface, reduced the interfacial tension to low values, reached the CMC at low concentration and presented low molecular area adsorbed at the interface.

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