Molecular structure characterization of asphaltene in the presence of inhibitors with nanoemulsions

Abstract

The decrease of aromaticity and the reduction in the aliphatic side chains of asphaltene are responsible for increased asphaltene stability.

Effect of ultrasound irradiation on asphaltene aggregation and implications to rheological behavior of bitumen

“…Rogel (2015, 2017) proposed that computing the ratio of the integrated intensity of the peak of sp 2 C = C vibrating at ∼ 1600 cm −1 to that of sp 3 C–H appearing at ∼ 2900 cm −1 could enable the quantification of the molar ratio of aromatic rings to aliphatic side chains [51] , [52] . Alhreez and Wen (2019) proposed that the ratio 3100 cm −1 /2900 cm −1 is an indicator of the number of carbon atoms per alkyl chain [53] . However, it should be noted the determination of these ratios would assume that the extinction coefficients of the functional groups do not change among the fraction [51] , [54] .…”

Kinetic Study of Controlled Asphaltene Inhibitor Release from Nanoemulsions

“…However, DBSA NEs are able to prevent asphaltenes from precipitating to spherical nanometric particles having a diameter of around 5−30 nm with a large stacking distance (d m ) between aromatic rings of asphaltene of about 0.389 nm. 38 The stacking distance between the aromatic rings, d m , was measured from the high-resolution TEM image of the asphaltene suspension with 20 vol % DBSA NEs using the selected area electron diffraction (SAED) pattern and ImageJ software with the error percent < 3.125%, as shown in Figure 9C. It is evident that these results are in good agreement with those obtained by DLS.…”

SiO2 Biogenic Nanoparticles and Asphaltenes: Interactions and Their Consequences Investigated by QCR and GPC-ICP-HR-MS

“…The selective removal and fractionation of asphaltenes is required to produce homogeneous feedstock, making them easier to upgrade or use in other chemical industries 3 . For this purpose, the use of inhibitors that can prevent or delay asphaltene aggregation and deposition is a vast research field that goes from molecules, which can act as primary asphaltene dispersants or anti-flocculants [11][12][13][14][15][16][17] , to nanoparticles, which can adsorb asphaltenes and therefore inhibit their aggregation or deposition [18][19][20][21][22][23][24] . The use of nanoparticles can be advantageous over chemical inhibitors due to their easily tunable surface functionalities, high chemical and thermal stability in harsh conditions (high temperature, high salinity, high pressure, etc.…”