沥青质分散剂对沥青质的稳定及缔合的影响

The ability to stabilize asphaltene of DBSA, DP and DAL as the asphaltene dispersants in toluene/heptane solution was investigated by UV-Vis spectrum. A study of the dispersion and aggregation of asphaltene with different asphaltene dispersants was performed with a capillary tube viscosimeter. The aggregation number of the asphattene was determmed. The results showed that the dispersants could stabilize asphaltene in toluene solution, increased the asphaltene amount in solution. The effectiveness of these dispersants followed the order: DBSA>DP>DAL. It was found that the three asphaltene dispersants had the similar effect on the asphaltene aggregation. DBSA had the best effect on the asphaltene aggregation and the relative viscosity was increased with the addition. The aggregation number of asphaltene in toluene was decreased by addition of DBSA, DP and DAL. The retardation of asphaltene aggregation was found to be in the order: DBSA>DP>DAL. This order was matched by the acidity of these dispersants.