减黏裂化产物的长期储存稳定性

利用不同储存条件下,减黏产物运动黏度、酸值、质量损失、胶质和沥青质含量的变化,研究了委内瑞拉奥里常渣减黏产物长期储存稳定性的影响因素。结果表明,氧化缩聚、轻组分挥发和无氧缩聚作用影响减黏产物的长期储存稳定性,其中氧化缩聚作用最显著。热反应结束后,减黏产物中自由基并没有完全进行链终止反应,室温下自由基继续发生反应,减黏产物的稳定性与其中所含的自由基密切相关。不同储存条件下产物的沥青质和胶质的芳碳率均略低于减黏产物,沥青质间并没有发生缩聚,不易产生分层现象,减黏产物较稳定。

Long-term storage stability of visbreaking products

Influence factors of long-term storage stability of the Venezuela Orinoco AR visbreaking products were studied by the changes of kinematic viscosity，TAN（Total Acid Number），weight loss，resin and asphaltene contents of visbreaking products in different storage conditions. It was found that the long-term storage stability of the visbreaking products is influenced by oxidative polycondensation, light components' volatilization and non-oxidative polycondensation, among which the effect of oxidative polycondensation is the most significant. Free radical reaction did not terminate after thermal reaction finished. The long-term storage stability of visbreaking products was closely related to free radical. Aromatic carbon ratios of resin and asphaltene of all visbreaking products were lower than that of the original visbreaking product. Asphaltene did not occur polycondensation, so visbreaking products could hardly arise layer phenomenon and was more stable.