Kinetics and isotherms of asphaltene adsorption in narrow pores

Alkafeef, Saad F.; Al-Marri, Salem S.

doi:10.1016/j.cocis.2016.06.005

Cited by 10 publications

(6 citation statements)

References 16 publications

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“…Our simulation works also indicated that the humic acids would form a hollow cone-shaped cavity with a hydrophobic interior (aromatic rings) to entrap the asphaltenes, which decreased the diffusion of asphaltenes by up to one-order of magnitude and modified the asphaltene surface from hydrophobic to hydrophilic . Although experimental works on the adsorption of asphaltenes on sand and clay have been previously reported, − it remains unclear how the interactions between humic acids and asphaltenes would influence surface adsorption kinetics of the asphaltenes.…”

Section: Introductionmentioning

confidence: 56%

Adsorption of Asphaltenes at Oil–Water and Oil–Clay Interfaces in the Presence of Humic Acids

Sun

Chen

2019

Langmuir

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Humic substances in the soil and underground water are important media for the environmental fate and transport of oil pollutants, but direct experimental evidence is lacking on the effects of humic acids on the interfacial activity and adsorption properties of oil asphaltenes in the soil. In this study, the oil−water interfacial tension (IFT) was measured by optical contact angle instruments, while the isothermal adsorption of asphaltenes on two montmorillonites and one kaolinite was fitted using four classical models. Results demonstrated that the oil−water IFT decreased by 37.5% when the asphaltenes (500 mg L −1 ) were present in the oil, which further decreased by 62.7% when the humic acids (25 mg L −1 ) were added in the water. The best-fitted form of isotherm equation (Langmuir model) and the adsorption capacity were not changed by coating humic acids on the clay surface prior to asphaltene adsorption, but the presence of humic acids on the clay surface doubled the adsorption rate. Results also revealed that the asphaltenes could coaggregate with the humic acids at the oil−water interface or in the bulk water, but they were unlikely to coaggregate with the humic acids binding on the clay surface.

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Section: Introductionmentioning

confidence: 56%

Adsorption of Asphaltenes at Oil–Water and Oil–Clay Interfaces in the Presence of Humic Acids

Sun

Chen

2019

Langmuir

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“…The ratio of SiO 2 / Al 2 O 3 in zeolite X is between 2.0 and 3.0. The SiO 2 /Al 2 O 3 ratio of ZSM-5 varies in a wide range and range of pore size is 0.54-0.56 nm [3].…”

Section: Introductionmentioning

confidence: 98%

Isothermal study of asphaltene adsorption over 4A, 13X, ZSM-5, clinoptilolite zeolites, and phoslock

2020

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The paper reports the adsorption studies of asphaltenes of Iran’s heavy crude oil on some natural and synthetic alumino-silicates. Asphaltenes were precipitated using n-heptane. Toluene was used as a precipitating solvent of asphaltenes and several zeolites including 4A, ZSM-5, Clinoptilolite, and La-modified bentonite (Phoslock) as adsorbents. FTIR analysis indicated the asphaltenes which comprise a complex of aromatic, aliphatic, and polar compounds. The pore size and outer surface area of the adsorbents were determined by BET method and the following order was found between outer surface areas: ZSM-5 (238.27 m2 g−1) > Clinoptilolite (28.75 m2 g−1) > Phoslocks (27.92 m2 g−1) > zeolite 4A (21.11 m2 g−1) > Zeolite 13X (317.24 m2 g−1). Besides, the adsorption isotherms were investigated with the conventional isotherm models and it was indicated that the Langmuir isotherm fitted the experimental data. Zeolite 13X with the highest specific surface area and pore size exhibited the maximum adsorption capacity, indicating that there is a direct relationship between surface area and adsorption capacity. However, it seems that the pore size effect is more prominent because of the large size of asphaltene’s molecules.

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“…During the oil exploitation process, these characteristics of asphaltenes can cause favorable and unfavorable interfacial adsorption phenomena at the solid–liquid interface. On the one hand, the interfacial adsorption of asphaltenes on nanoparticle adsorbent surfaces can effectively prevent the precipitation/deposition phenomenon of asphaltenes in oil production. , On the other hand, the interfacial adsorption of asphaltene on mineral rock surfaces can cause various problems in oil production, which would alter the wettability of reservoir rocks, reduce the radius of reservoir pores, and increase the resistance of the flow stream. − These disadvantages of asphaltene adsorption at rock surfaces would result in significantly reduced oil recovery and a large amount of economic loss. Thus, there is a great necessity to investigate the intermolecular adsorption interaction between asphaltenes and reservoir rock surfaces, which can provide fundamental and practical significance for enhanced oil recovery (EOR) in the petroleum industry.…”

Section: Introductionmentioning

confidence: 99%

Insights into Asphaltene Adsorption on Sandstone Surface by Experiment and Simulation: Performance and Mechanism Investigation

Ma,

Huang,

Wan

et al. 2024

Energy Fuels

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Asphaltene adsorption at rock surfaces has important effects on enhanced oil recovery (EOR) in the petroleum industry. In this work, the adsorption interaction of asphaltene with sandstone rock of albite and quartz is investigated to derive experimental and simulation insights. By macroscopic experimental investigation, the interaction performances were evaluated by thermodynamic models of the Langmuir and Freundlich fittings and kinetic models of pseudo-first-order (PFO) and pseudosecond-order (PSO) fittings. The results indicate monolayer molecular asphaltene adsorption for both albite and quartz, but "fast adsorption−slow desorption" is observed for albite and "slow adsorption−fast desorption" for quartz. Meanwhile, albite shows a larger adsorption capacity and stronger adsorption spontaneity with the results of q m(albite 1#) = 2.58 mg g −1 > q m(quartz 1#) = 1.22 mg g −1 and ΔG albite 1 = −2.40 kJ mol −1 < ΔG quartz 1 = −0.97 J mol −1 . By microscopic molecular dynamic simulation (MDS) simulation, the interaction performances were studied for three asphaltene molecules of archipelago-type, island-type, and resin-type. Albite rock shows much higher system stability than quartz, with a more negative final energy of ΔE albite−quartz = −59 kJ mol −1 , and archipelago asphaltene shows the smallest adsorption equilibrium energy, with E ads(archipelago) = −104 < E ads(island) = −71 < E ads(resin) = −58 kJ mol −1 for albite adsorption and E ads(archipelago) = −45 < E ads(island) = −35 ∼ E ads(resin) = −35 kJ mol −1 for quartz adsorption. The interaction mechanism was illustrated by molecular orientation and force dominance for asphaltene adsorption, which "lie sideways" at low concentrations but "stand upright" at high concentrations. This work provided information on the performance and mechanism of asphaltene adsorption at rock surfaces, which is of great significance in reservoir exploitation and enhanced oil recovery.

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Kinetics and isotherms of asphaltene adsorption in narrow pores

Cited by 10 publications

References 16 publications

Adsorption of Asphaltenes at Oil–Water and Oil–Clay Interfaces in the Presence of Humic Acids

Adsorption of Asphaltenes at Oil–Water and Oil–Clay Interfaces in the Presence of Humic Acids

Isothermal study of asphaltene adsorption over 4A, 13X, ZSM-5, clinoptilolite zeolites, and phoslock

Insights into Asphaltene Adsorption on Sandstone Surface by Experiment and Simulation: Performance and Mechanism Investigation

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