Article
Energy & Fuels
Narges Bahaloo Horeh, Negahdar Hosseinpour, Alireza Bahramian
Summary: This study provides an asphaltene inhibitor (BZSS-012) and emphasizes the mutual dependence of the inhibitor-asphaltene molecular structure/functional groups for successful inhibition. Two dead oil samples were used to extract asphaltenes and prepare model oils, and interfacial rheology measurements and conventional asphaltene dispersant tests were performed to evaluate the inhibitor performance. It was found that the inhibitor achieved an efficiency of 99.2% in the F-model oil, higher than the 66.7% efficiency in the A-model oil. Monitoring the standard deviation of dynamic interfacial tension was considered as an appropriate method to screen asphaltene inhibitors.
Article
Chemistry, Multidisciplinary
Xiaoqing Li, Dandan Liu, Hao Sun, Xiaobing Li
Summary: The effect of oil-displacing agent composition on the oil/water interface stability of asphaltene-rich ASP flooding-produced water was investigated. Molecular dynamics simulation and experimental tests were conducted to study the adsorption behavior of oil displacement agents and asphaltenes on the interface, as well as the variations in interfacial properties. The results showed that the interaction between oil displacement agents and asphaltenes enhanced the interfacial film strength and impeded the oil/water separation process.
Article
Computer Science, Artificial Intelligence
Ruochen Liu, Dawei Jiang, Xilong Zhang
Summary: This article proposes a stable reinforcement learning framework for recommendation systems, addressing previous research limitations by redefining the Markov decision process of RL and introducing a stable module. The experiments confirm the effectiveness of the proposed algorithm.
IEEE INTELLIGENT SYSTEMS
(2022)
Article
Chemistry, Physical
Javad Ebrahimi, Behnam Shahsavani, Mojtaba Ghaedi, M. Reza Malayeri, Masoud Riazi
Summary: This study presents a systematic screening approach to evaluate the efficacy of different inhibitors for two crude oils with high asphaltene content. Results show that DBSA is the most efficient inhibitor, but its applicability is limited in cases where both water production and asphaltene deposition occur simultaneously. Additionally, dispersant 110 demonstrates superior dispersion capabilities under low centrifugal force. Overall, dispersant 110 shows the most promising performance in different test methods.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Energy & Fuels
Aisha T. Khaleel, Caleb J. Sisco, Mohammad Tavakkoli, Francisco M. Vargas
Summary: Asphaltenes, a polydisperse fraction present in crude oil, play a crucial role in deposition processes. Experimental and modeling studies show that the polydispersity of asphaltenes affects the amount of deposition.
Article
Environmental Sciences
Anna Siatecka, Patryk Oleszczuk
Summary: The stability of biochars derived from sewage sludge was found to be closely related to their content and character of C. Biochars with higher aromaticity, lower organic content, and higher pyrolysis temperatures were more stable, while low-temperature biochars were more susceptible to oxidation. The more aromatic structure of C limited access of O2 molecules to biochar interior, resulting in concentrated aging processes on the surface layer and less property changes.
Article
Chemistry, Physical
Ali Ghamartale, Sohrab Zendehboudi, Nima Rezaei, Ioannis Chatzis
Summary: Chemical inhibitors, such as surfactants, can improve the asphaltene stability in crude oil by disrupting the asphaltene aggregation intensity and aggregate characteristics. Molecular dynamics simulations show that increasing the concentration of chemical inhibitors can reduce the aggregation intensity of asphaltenes. The research also reveals that the addition of certain inhibitors can significantly affect the dispersity and shape of aggregates, especially for specific types of asphaltenes.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Environmental Sciences
Dongliang Hu, Xingyu Gu, Lei Lyu, Jianzhong Pei, Bingyan Cui
Summary: The study investigated the chemical reactivity of asphaltene during aging under different environmental conditions, finding that aging involves a series of subreactions with varying kinetic rates. Water presence slightly accelerates asphaltene aging, due to improved electron transfer ability in an aqueous solvent, whereas under ultraviolet radiation the aging rate significantly increases. This work bridges electronic-scale modeling with experimental observations to provide theoretical guidance for preventing or delaying aging-induced failure of asphalt pavements.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Multidisciplinary
Sajjad Ansari, Hamid Bahmaninia, Mohammad-Reza Mohammadi, Mehdi Ostadhassan, Saeid Norouzi-Apourvari, Mahin Schaffie, Mohammad Ranjbar, Abdolhossein Hemmati-Sarapardeh
Summary: This study investigated the controlling factors on the adsorption of different types of asphaltene on the surface of dolomite and found that the total nitrogen and sulfur content and the aromaticity of the asphaltenes had a significant impact on adsorption. In dynamic experiments, an increase in flow rate led to a decrease in asphaltene adsorption. The findings of this study are important for better management of oil production from dolomitic reservoirs.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Kheira Gharbi, Chahrazed Benamara, Khaled Benyounes, Malcolm A. Kelland
Summary: The study highlights the importance of separating the acidic and basic fractions of asphaltenes in order to understand their structure and influence on the selection and mechanism of asphaltene inhibitors. Results indicate that the acid and base fractions of asphaltenes contain aromatic and polar compounds with specific functional groups such as carboxylic acids, phenols, amines, and aliphatic chains.
Article
Engineering, Chemical
Mahshid Nategh, Hojjat Mahdiyar, M. Reza Malayeri, Simon Unz, Michael Beckmann
Summary: The study reveals that the liquid loses solubility with increased nC(7) volume fraction, attributed to the reduction in its electron donor component. In the early stages of nC(7) addition, both asphaltenes exhibit similar resistance to aggregation, but in later stages they tend to have different precipitation propensities.
CHEMICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Xianbin Huang, Jinsheng Sun, He Li, Ren Wang, Kaihe Lv, Haichao Li
Summary: This paper introduces a hydrophobic nano-silica for strengthening the wellbore wall when using a water-based drilling fluid. The wellbore-strengthening performance and mechanism were studied through a series of experiments and characterization analysis. The experimental results showed that the hydrophobic nano-silica exhibited good performance in inhibiting shale swelling and dispersion, improving wellbore stability, and outperforming commonly used shale inhibitors. The wellbore-strengthening effect can be attributed to mechanisms such as charge balance, surface structure modification, and pore plugging.
Article
Construction & Building Technology
Fangjin Li, Yuhong Wang, Kecheng Zhao
Summary: This study aims to explore the physicochemical origins of property variations in aged asphalt binders. By testing the zero-shear viscosities (ZSVs) of the binders and their maltene phases, as well as examining the size of asphaltenes, it was found that asphaltene content and maltene viscosity can explain most of the commonly reported rheological properties of asphalt binders. However, asphaltene content alone cannot explain the fatigue performance of asphalt binders.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Thermodynamics
Xiaocheng Han, Wufeng Su, Jie Gong, Zhonghua Xi, Junsheng Zhang, Jun Cai, Qingjun Wang, Hongfeng Xie
Summary: The study found that introducing asphaltene fillers into epoxy resin affects the material properties, such as increasing viscosity, enhancing Young's modulus, and storage modulus. With an increase in asphaltene content, aggregation and network structures appear in the microstructure, while there is minimal impact on glass transition temperature, damping properties, and thermal stability.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Construction & Building Technology
Rodrigo Shigueiro Siroma, Mai Lan Nguyen, Pierre Hornych, Jean-Pascal Planche, Jeramie Adams, Joseph Rovani, Yogesh Kumbargeri, Yvong Hung, Aurelia Nicolai, Layella Ziyani, Emmanuel Chailleux
Summary: Aging leads to an increase in polarity and higher molecular weight distribution in asphalt binders, indicating molecular agglomerations. The findings of this study show that the delta-method and MAI are reliable in estimating the changes in binder chemistry and molecular agglomeration. These results contribute to a better understanding of binder aging and its impact on pavement durability.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
