Comparison of Hansen Solubility Parameter of Asphaltenes Extracted from Bitumen Produced in Different Geographical Regions

Abstract

The Hansen solubility parameters (HSPs) of asphaltenes extracted from oil sand bitumen samples produced at Athabasca in Canada and also from a vacuum residue fraction (VR) produced in the Middle East were determined by the Hansen solubility sphere method. For calculation of HSPs, the solubilities of asphaltenes were determined using a dynamic light scattering (DLS) method by dissolving or dispersing the asphaltenes in various solvents and measuring the particle size distributions thereof. The particle diameters of asphaltenes in good solvents were lower than its detection limit (<1 nm). It was demonstrated in the present study that asphaltenes differing in elemental composition had different HSP values corresponding to dispersion, dipole interaction, and hydrogen-bonding forces (δd, δp, and δh, respectively). Experimental results suggested that the differences in HSP values of the asphaltenes were influenced by the H/C ratio, oxygen content, and average asphaltene molecular weight.

Solvent desorption of asphaltenes from solid surfaces

“…Several studies have dealt with determining the solubility parameters of asphaltenes mostly using the solubility sphere method based on experimental determination of the solubility or non-solubility of asphaltenes in various solvents with known solubility parameters [23][24][25] . By Fossen et al 26 used another method to determine the HSP for crude oils and SARA fractions including asphaltenes.…”

Solubility of N,N′-Di(1-naphthyl)-N,N′-diphenyl Benzidine (NPB) in Various Organic Solvents: Measurement and Correlation with the Hansen Solubility Parameter

“…[3][4][5][6][7][8]12,13,[15][16][17][18][19][20][21][22][23][24][25][26][27] The solubility parameter in its original Hildebrand form  (MPa 1/2 ) is defined as the square root of the cohesive energy density:…”

“…[4][5][6][7]12,[18][19][20][21][22][24][25][26][27] This method is based on the principle that good solvents are located within a threshold radius 0 R from the solute ( Figure 1. Solubility of NPB in organic solvent was determined from the UV absorbance of saturated solution prepared in the following procedure.…”

Asphaltene Aggregation Behavior in Bromobenzene Determined By Small-angle X-ray Scattering

“…The HSPs, δ d , δ p , and δ h , were 19.1, 4.2, and 4.4 MPa 0.5 , respectively. 23 Table 1 lists the HSP values of organic solvents and the ∆δ against CaAs. The solvents used in previous SAXS/SANS studies have ∆δ values ranging from 3.4 (quinoline) to 6.8 MPa 0.5 (cis-decahydronaphthalene).…”