Self-assembly and solubility properties of polyaromatic compounds studied by molecular dynamics simulation

Cao，Tiantian1,2; Wang，Chenghong3; Xiong，Yong2; Song，Haitao1; Xie，Nanhong1; Qi，Liya3; Xu，Shengming2; Lin，Wei1; Xu，Zhenghe4,5

2020-10-01

10.1016/j.fuel.2020.118060

FUEL   影响因子和分区

0016-2361

1873-7153

In the present study, molecular dynamics (MD) simulations were used to systematically investigate the solubility properties of model compounds of asphaltenes and maltenes. These model compounds with different double bond equivalent (DBE) and carbon numbers were reconstructed from the vacuum residue of crude oil. Asphaltenes occupy a different compositional and molecular structure space from maltenes due to their significantly higher aromaticity than maltenes. The boundary of asphaltenes and maltenes was previously determined by Rodgers et al. from their experimental study on a given class of crude oils. Based on MD simulations using various types of model compounds, the Hildebrand solubility parameters (HSP) of these model compounds can be obtained. The results of simulation show the following trend: i) for a constant DBE value, the HSP values decrease with increasing alkyl chain lengths; and ii) for a constant alkyl chain length, the HSP values increase with increasing the DBE values. The HSP threshold value of solubility range was found to be δs ± 2.86 MPa, which is a good indicator to distinguish the composition and structure boundary for asphaltenes and maltenes. The MD simulation results provided molecular-level theories to distinguish the compositional space of asphaltenes and maltenes and determine solubility properties of crude oils.

Asphaltenes Molecular dynamics simulation Self-assembly of polyaromatic molecules Solubility parameters Solvation free energy

SCI ; EI

英语

其他

National Natural Science Foundation of China[21333005]

Energy & Fuels ; Engineering

Energy & Fuels ; Engineering, Chemical

WOS:000541255200010

ELSEVIER SCI LTD

20202208760657

Chain length ; Crude oil ; Solubility ; Free energy ; Self assembly ; Asphaltenes

Petroleum Deposits:512.1 ; Petroleum Refining:513 ; Thermodynamics:641.1 ; Physical Chemistry:801.4 ; Atomic and Molecular Physics:931.3 ; Materials Science:951

ENGINEERING

2-s2.0-85085324342

Scopus

1.SINOPEC Research Institute of Petroleum Processing,Beijing,100083,China
2.Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing,100084,China
3.SINOPEC Beijing Research Institute of Chemical Industry,Beijing,100013,China
4.Department of Chemical and Materials Engineering,University of Alberta,Edmonton,T6G 1H9,Canada
5.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Cao，Tiantian,Wang，Chenghong,Xiong，Yong,et al. Self-assembly and solubility properties of polyaromatic compounds studied by molecular dynamics simulation[J]. FUEL,2020,277.

Cao，Tiantian.,Wang，Chenghong.,Xiong，Yong.,Song，Haitao.,Xie，Nanhong.,...&Xu，Zhenghe.(2020).Self-assembly and solubility properties of polyaromatic compounds studied by molecular dynamics simulation.FUEL,277.

Cao，Tiantian,et al."Self-assembly and solubility properties of polyaromatic compounds studied by molecular dynamics simulation".FUEL 277(2020).