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Issue
Korean Chemical Engineering Research,
Vol.56, No.1, 14-23, 2018
Effect of Dodecylbenzene Sulfonic Acid on the Behavior of Asphaltene Aggregation in a Solvent Deasphalting System
Liu L, Go KS, Nho NS, KiM KH, Rhee YW
The effect of dodecylbenzene sulfonic acid (DBSA) with different addition amount of DBSA (MDBSA), temperatures and solvent-to-oil ratio (SOR, v/v) on asphaltene aggregation in a solvent deasphalting system was investigated. Increasing the MDBSA at SOR 10 and 55 oC caused the asphaltene removal ratio (ARR) to increase first, then maximize at 1 wt% of MDBSA and then decrease continuously. Based on the SARA (saturate, aromatic, resin, asphaltene) composition, the adsorption amount of DBSA on the asphaltene surface and the self-aggregation of the DBSA, the reason for the change in ARR with MDBSA was found due to the adsorption mechanism. In addition, the asphaltene-resin- DBSA colloidal size confirmed the change of adsorption behavior between the asphaltene and DBSA. Based on the results of this study, a hypothetical adsorption mechanism of DBSA on asphaltene aggregation in the solvent deasphalting system was conceived of and proposed.
Keywords: Asphaltene removal ratio; Addition amount of DBSA; The level of self-aggregation of DBSA; Asphaltene colloid size; Adsorption mechanism
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