Article
Chemistry, Multidisciplinary
Duraisami Dhamodharan, Cheol-Woong Park, Pradnya N. P. Ghoderao, Hun-Soo Byun
Summary: The aim of this study was to understand the solubility curve in solvents at supercritical conditions, including thermodynamics modeling and van der Waals-type models. The solubility of alkyl oleate monomers in supercritical carbon dioxide (Sc-CO2) was predicted using a thermodynamic approach and validated with experimental data. The results showed that the solubility increased with temperature and mole fraction of the solute in the binary mixtures. The solubility curves of the different alkyl oleate monomers in Sc-CO2 exhibited a consistent upward trend with temperature. Comparison with a theoretical model demonstrated the influence of adjusted factors on the accuracy of the predictions.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Energy & Fuels
Nanjun Lai, Xin He, Junqi Wang, Lei Tang
Summary: This study investigates the influence of high-temperature and high-salt oil reservoir conditions on the stability and stability mechanism of wormlike micelle-CO2 foam systems. The results indicate that the higher the temperature, the worse the foam stability. The effect of salinity on foam stability is slightly synergistic, but excessive salinity has an antagonistic effect. By using rheological theory to indirectly evaluate foam performance, this study provides a comprehensive theoretical guidance for the practical application of the wormlike micelle-CO2 foam system in enhanced oil recovery.
Article
Chemistry, Physical
Hyun-Seok Lee, Pradnya N. P. Ghoderao, Min Soo Park, Hun-Soo Byun
Summary: The phase behavior of allyl acetoacetate, methyl acetoacetate, and ethyl acetoacetate in supercritical CO2 was studied. The solubility curves of binary mixtures of these three systems were investigated at five temperature sets and pressures. The results showed that these systems exhibited critical mixture curves under type-I behavior. The solubility and critical mixture curves were correlated using the Peng-Robinson equation of state with van der Waals mixing rules, with good agreement between experimental and calculated values.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Geosciences, Multidisciplinary
Yapeng Tian, Binshan Ju, Xudong Wang, Hongya Wang, Jie Hu, Yingsong Huang, Nannan Liu, Yintao Dong
Summary: The phase behavior of fluid in shale reservoirs is influenced by nanopore sieving effect and capillary pressure, with capillary pressure suppressing bubble point pressure. Different distributions of fluid components are observed in various parts of shale media. CO2 injection can improve membrane efficiency in shale oil reservoirs.
NATURAL RESOURCES RESEARCH
(2021)
Article
Engineering, Chemical
Chenliang Wang, Xiaofei Man, Leming Ou
Summary: The effect of temperature on the flotation behavior of sodium oleate on the surface of diaspore was studied using molecular dynamics simulations at three different temperatures (278.15 K, 303.15 K, and 328.15 K). Various analyses revealed that a certain temperature increase was beneficial for flotation, leading to better reagent dispersion and mineral-reagent interactions. However, increased temperature also negatively affected reagent adsorption due to enhanced molecular motion. This study has theoretical implications for understanding the role of temperature in the flotation behavior of ionic surfactants on mineral surfaces.
MINERALS ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Maria Carolina Pereira Goncalves, Jessica Cristina Amaral, Roberto Fernandez-Lafuente, Ruy de Sousa Junior, Paulo Waldir Tardioli
Summary: This paper investigated the Lipozyme 435-catalyzed synthesis of xylose oleate in MEK, studying the effects of substrate ratios, temperature, and time on esterification rates. Results showed that an excess of oleic acid was favorable for the reaction, and the highest Lipozyme 435 activities occurred between 55 and 70 degrees C. The study also found that the predicted kinetic model fitted well with experimental data and there was no evidence of inhibitions.
Article
Chemistry, Applied
Dan Zhou, Leilei Zhang, Wengang Liu, Gang Xu, Ji Yang, Qike Jiang, Aiqin Wang, Jianzhong Yin
Summary: This study reports the chemoselective hydrogenation of 3-nitrostyrene over noble-metal-free Co-N-C SAC in compressed CO2 as a green solvent for the first time. An interesting inverted V-curve relation is observed between the catalytic activity and CO2 pressure, with a phase behavior study revealing the formation of a bi-phase under certain conditions which significantly affects the reaction kinetics of the catalytic system.
CHINESE JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Jian-yi Liu, Xue-yi Hu, Lei Zhang, Yong-mei Xia
Summary: The study shows that the binary surfactant system of nonylcyclohexanol polyethoxylate (NCEOn) with sodium oleate (NaOA) exhibits similar or superior performance in terms of salt tolerance, phase behavior, interface tension, and lime soap dispersing capability in brine compared to nonylphenol polyethoxylate (NPEO10). This research is of great significance for the substitution of NPEO10 in the field.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Energy & Fuels
Xiangji Dou, Yisong Zhang, Jing Guo, Kun Qian
Summary: The confinement effect of nanopores significantly influences the fluid-phase behavior of shale oil reservoirs. Understanding the phase change characteristics of fluids in nanopores is crucial for designing development plans, production systems, and enhanced oil recovery (EOR) methods for shale oil reservoirs. Molecular dynamics simulation was used to analyze the phase behavior of single-component and hydrocarbon-CO2 mixture systems in organic nanopores. The results revealed that the confinement effect on the phase change pressure of single-component systems varied depending on the electron cloud distribution. The confinement effect became stronger as the carbon chain length of hydrocarbons increased. Furthermore, the confinement effect shrank the P-T phase envelope, making CO2 more miscible with shale oil in nanopores and reducing the adsorption of hydrocarbons on organic pore walls.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Balaji Panchal, Yongjing Hao, Zhibin Han, Tao Chang, Zheng Zhu, Xionglei Wang, Shenjun Qin
Summary: In this study, fatty acid esters were efficiently synthesized using a reusable lipase immobilized with a novel porous ionic polymer. The immobilized lipase showed excellent catalytic activity and stability, making it a cost-effective and environmentally friendly catalyst for biodiesel production.
JOURNAL OF CATALYSIS
(2022)
Article
Engineering, Chemical
Peng Zhang, Song Wang, Bingjie Pang, Xuefeng Zhu, Weishen Yang
Summary: The study revealed the impact of the carbonate-ionic conducting phase on CO2 permeation process, showing that with an increase in Li2CO3 addition amount, CO2 flux initially increases and then decreases, shifting the controlling step from bulk diffusion to surface reaction.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Shaojie Li, Feng Liu, Xia Liao, Suilin Liu, Guangxian Li
Summary: This study explores the crystallization behavior induced by the crystallization memory effect of poly(D-lactic acid) (PDLA) under CO2. The results show that CO2 decreases the difference in nucleation kinetics between PLA under atmosphere and CO2, and increases the secondary nucleation constant. CO2 affects crystallization morphology by activating molecular chain mobility and preventing branching of the original central spherulite, leading to the formation of more perfect crystals.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Energy & Fuels
Yapeng Tian, Zhan Qu, Ping Wang, Nannan Liu, Binshan Ju, Jie Zhan, Mingxian Wang, Yintao Dong
Summary: This study is the first to use the modified Peng-Robinson equation of state (PR-EOS) considering fluid-solid interaction to study the effect of wettability on asphaltene precipitation in CO2 injection into shale reservoirs. The results show that wettability plays a significant role in asphaltene precipitation, and there is a coupling effect between wettability and CO2 in shale oil.
Article
Chemistry, Physical
Bruno Zezere, Joao Iglesias, Ines Portugal, Jose R. B. Gomes, Carlos Manuel Silva
Summary: This study investigates the diffusivity of quercetin in two compressed liquid cosolvents (ethanol and ethyl acetate) as alternatives to harmful organic compounds. The research highlights the impact of temperature, pressure, and hydrodynamic coordinates on diffusion coefficients, and discusses the unreliability of predicting equations for D-12 data. Various models are used to fit the data, with differences observed in the accuracy of predictions.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Energy & Fuels
Angang Zhang, Zifei Fan, Lun Zhao, Jun He
Summary: This paper investigates the influence of water vapor on the phase behavior of gas condensate reservoirs. The study finds that the impact of water vapor on condensate depends on the type of compounds. Water vapor has the largest effect on the content change of CH4, and the smallest effect on C2 to C6. The presence of water vapor makes it easier for condensate to drop out of the gas phase.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
