Asphaltene-In-Toluene Lab Report
3.3 Results and Discussion
3.3.1 Particle Size of Asphaltenes.
DLS was utilized to obtain the hydrodynamic radius of asphaltenes in toluene, which could help understand the behaviors of asphaltenes in the bulk solutions and oil/water interfaces. Figure 1 shows the particle size distribution of asphaltenes under different concentrations at 23 ℃ and under 2000 mg/L at different temperatures. A summary of the average particle size under different concentration and temperature conditions is shown in Table S1 and Table S2 in the Supporting Information.
Figure 3.1 Size distribution of asphaltene aggregates measured by DLS for asphaltene solutions in toluene of different concentrations (i.e. 50 - 2000 mg/L) at 23 ℃ and 2000 mg/L asphaltenes in toluene solution at 50 ℃ and 70 ℃.
Figure 3.1 shows that the average size of asphaltene aggregates increases with increasing the solution concentration indicating the formation of larger asphaltene aggregates in bulk solutions at higher concentration. Figure 3.1 also shows that the average size of asphaltene aggregates in 2000 mg/L asphaltene solution decreases with increasing temperature from 23 ℃ to 70 ℃. Such …show more content…
As shown in Figure 3.2A, under a fixed temperature 23 ℃, the dynamic IFT decreases significantly with time during the first several hundred seconds and then the reduction slows down with time. For all the asphaltene concentrations investigated (50 to 2000 mg/L), the same trend has been observed. It is also found that the IFT decreases as the asphaltene concentration increases, which implies that a growing number of asphaltenes migrate to the oil/water interface under higher concentration condition. Figure 3.2B shows the dynamic IFT between brine water and 100 mg/L asphaltenes in toluene solution at different temperatures (23 to 70 ℃), which indicates that the IFT decreases much faster with time under higher
3.3.1 Particle Size of Asphaltenes.
DLS was utilized to obtain the hydrodynamic radius of asphaltenes in toluene, which could help understand the behaviors of asphaltenes in the bulk solutions and oil/water interfaces. Figure 1 shows the particle size distribution of asphaltenes under different concentrations at 23 ℃ and under 2000 mg/L at different temperatures. A summary of the average particle size under different concentration and temperature conditions is shown in Table S1 and Table S2 in the Supporting Information.
Figure 3.1 Size distribution of asphaltene aggregates measured by DLS for asphaltene solutions in toluene of different concentrations (i.e. 50 - 2000 mg/L) at 23 ℃ and 2000 mg/L asphaltenes in toluene solution at 50 ℃ and 70 ℃.
Figure 3.1 shows that the average size of asphaltene aggregates increases with increasing the solution concentration indicating the formation of larger asphaltene aggregates in bulk solutions at higher concentration. Figure 3.1 also shows that the average size of asphaltene aggregates in 2000 mg/L asphaltene solution decreases with increasing temperature from 23 ℃ to 70 ℃. Such …show more content…
As shown in Figure 3.2A, under a fixed temperature 23 ℃, the dynamic IFT decreases significantly with time during the first several hundred seconds and then the reduction slows down with time. For all the asphaltene concentrations investigated (50 to 2000 mg/L), the same trend has been observed. It is also found that the IFT decreases as the asphaltene concentration increases, which implies that a growing number of asphaltenes migrate to the oil/water interface under higher concentration condition. Figure 3.2B shows the dynamic IFT between brine water and 100 mg/L asphaltenes in toluene solution at different temperatures (23 to 70 ℃), which indicates that the IFT decreases much faster with time under higher