Self-crystallization behavior of paraffin and the mechanism study of SiO2 nanoparticles affecting paraffin crystallization

Wang, Chenhui; Gao, Lingyu; Liu, Menghui; Han, You

doi:10.1016/j.cej.2022.139287

Cited by 11 publications

(9 citation statements)

References 51 publications

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“…The best results were obtained at 100 ppm of PPD, above which the gelation worsened due to the self-aggregation of excess SiO 2 particles as a result of incomplete binding to POA. Wang et al 161 observed that SiO 2 particles affected wax crystallization at the microscopic level using molecular dynamics simulations, which was consistent with the conclusions in literature. 120 The incorporation of SiO 2 nanoparticles provides nonhomogeneous phase nucleation, attracting wax molecules to form clusters.…”

Section: Silicon Dioxide (Sio 2 )supporting

confidence: 88%

Research Status and Outlook of Mechanism, Characterization, Performance Evaluation, and Type of Pour Point Depressants in Waxy Crude Oil: A Review

Li,

Guo,

et al. 2024

Energy Fuels

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With the depletion of conventional oil resources, waxy crude oil has become a focus of development. Wax deposition is prone to occur in crude oil at low temperatures, and can easily cause pipeline blockage. Hence, preventing wax deposition while ensuring the safety of pipeline transportation and reducing energy consumption has become a popular research topic. Pour point depressants are normally used to solve the wax deposition problem. In this paper, recent research on pour point depressants is reviewed and the mechanism by which pour point depressants inhibit wax deposition is clarified. Commonly used characterization methods and performance evaluations in the research of pour point depressants are summarized. According to the composition of pour point depressants, the chemical structures and effects of polymers, surfactants, green pour point depressants, and nanohybridized pour point depressants are analyzed. Among these four, nanohybridized pour point depressants have better application prospects due to their unique size, excellent heat resistance, stability, and exceptional optical, electrical, and magnetic properties, which can effectively improve the inhibition performance of pure polymers or surfactants. Finally, future challenges in pour point depressants are analyzed.

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Section: Silicon Dioxide (Sio 2 )supporting

confidence: 88%

Research Status and Outlook of Mechanism, Characterization, Performance Evaluation, and Type of Pour Point Depressants in Waxy Crude Oil: A Review

Li,

Guo,

et al. 2024

Energy Fuels

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“…Then, a solid complex intermediate phase emerged as the solvent evaporated and the nuclei grew. As shown in Figure b, the diffusion coefficient ( D ) of the reactive ions in five different solvents was evaluated by molecular dynamics simulation, − including DMF, DMSO, 3F, CB, and TU (the D and corresponding deviation are presented in Table S1). The behavior of FA + ions may dominate the formation of nuclei and the growth of the intermediate phase since the concentration of FA + far exceeds that of other cations.…”

Section: Resultsmentioning

confidence: 99%

Diffusion-Controlled Crystal Engineering with Diverse Antisolvent Intervention for the Preparation of High-Quality Hybrid Perovskite Films

Zhang,

Li,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Antisolvent engineering is routinely used to modulate the crystallization of perovskite films as they can offer an additional driving force for nucleation. Actually, the intervention of antisolvent into nucleation is thought to involve some relatively fast and complex processes, which, however, are not fully understood so far. Here, the diffusion of the organic amine cation FA + (one dominated precursor) and its distribution in a spin-coating process in different antisolvents is simulated by the computational fluid dynamics (CFD) model. It is suggested that a moderate diffusion rate (like that in the case of toluene as an antisolvent) not only enables to form a very uniform distribution of FA + ions on the substrate, beneficial to the uniform nucleation of the intermediate phase, but also can balance the nucleation and growth rates of the intermediate phase, thereby suppressing undesired heterogeneous nucleation and growth. Results show that the perovskite film fabricated using toluene as an antisolvent has a high quality, based on which higher power conversion efficiencies of up to 24.32% are achieved for perovskite solar cells.

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“…The Optimized Potentials for Liquid Simulations-All Atom (OPLS-AA) force field was adopted to describe the interparticle interactions. This scheme has been widely benchmarked for the thermodynamic and configurational properties of alkanes, polymers, and biomolecules. − The particle mesh Ewald (PME) algorithm was used to evaluate the electrostatic interactions. Both the van der Waals and electrostatic interactions were truncated with cutoff values of 5.0 nm.…”

Section: Methodsmentioning

confidence: 99%

Cation-Dependent Oil–Rock Interactions in Nanopores: Insights from Core Flooding Experiments and Molecular Dynamics Simulations

Wu,

Huang,

et al. 2023

Energy Fuels

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A large amount of crude oil still adheres to the rock surface after water flooding in low-permeability reservoirs. Cations in the formation water were assumed to play a crucial role in crude oil adhesion. However, it lacks systematic investigation, and the mechanism remains unclear. In this work, the role of cations in these oil–rock interactions is investigated by performing water flooding experiments and molecular dynamics simulations. Results show that Ca2+ has a significant impact on the injection pressure and the oil recovery than Na+. The oil recovery of cores initially saturated by CaCl2 solution (39.02–47.48%) was lower than those saturated by NaCl solution (51.78–54.96%). It was found that the hydrated cations accumulate on the negatively charged rock surface to form a brine layer. The interaction energy between crude oil and rock surface was 1.7 times 0.5 M NaCl (−14.2 × 103 kJ·mol–1) when the brine layer contained 0.5 M CaCl2 (−24.2 × 103 kJ·mol–1), leading to the strong adhesion of crude oil. Thus, the amount of residual oil was higher in the presence of Ca2+ after water flooding. With the increase in Ca2+ concentration, the adhesion of crude oil became stronger, significantly reducing the efficiency of water flooding.

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Self-crystallization behavior of paraffin and the mechanism study of SiO2 nanoparticles affecting paraffin crystallization

Cited by 11 publications

References 51 publications

Research Status and Outlook of Mechanism, Characterization, Performance Evaluation, and Type of Pour Point Depressants in Waxy Crude Oil: A Review

Research Status and Outlook of Mechanism, Characterization, Performance Evaluation, and Type of Pour Point Depressants in Waxy Crude Oil: A Review

Diffusion-Controlled Crystal Engineering with Diverse Antisolvent Intervention for the Preparation of High-Quality Hybrid Perovskite Films

Cation-Dependent Oil–Rock Interactions in Nanopores: Insights from Core Flooding Experiments and Molecular Dynamics Simulations

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