Abstract:

Two-dimensional solubility parameters are applied to select the dewaxing solvents for diesel in improving its flowing performance at low temperature.Based on the established two-dimensional plane model, the two-dimensional solubility parameters of each components of diesels in 14 solvents were calculated, and the distance between solvent and n-alkane (R_c) in the two-dimensional plane was proposed as the solvent-solute dissolution judgment.From the analysis of the relationship between the two-dimensional solubility parameters of solvents and the n-alkane extraction yields (E), it was found that E increases with the increase in R_c except 2-propanol, which proves the feasibility by using R_c as the basis to select the dewaxing solvents.It was also found that the physical solubility parameters (Δ_p) have little influence on the dewaxing performance.The extraction is mainly influenced by the chemical solubility parameter (Δ_c) of the solvents, especially the dipolar solubility parameter.