委内瑞拉减压渣油供氢热转化基础研究

在热反应装置上考察了委内瑞拉合成原油减压渣油的供氢热转化与常规减黏裂化两种过程,利用显微镜观察了这两种反应体系的相态变化规律,研究了两种生成油的安定性并对两种残渣油的四组分组成进行了分析。结果表明,在反应温度为425℃时,随着反应时间的延长,采用显微镜能够清晰观察到无定型小体形成、长大及聚集的相态变化历程,两种过程残渣油的胶质与沥青质含量均呈下降趋势;相比常规减黏裂化,供氢热转化过程中供氢剂能够抑制无定型小体的长大、延缓相分离、抑制焦的形成、改善生成油安定性。

Hydrogen donor visbreaking of Venezuelan vacuum residue

Hydrogen donor visbreaking and conventional visbreaking processes of vacuum residue of Venezuelan synthetic crude oil were investigated in an autoclave. Phase changes of the two reaction systems were observed by a microscope during the thermal conversion. The stabilities of two kinds of visbroken oil were characterized and their SARA group compositions were analyzed. The results show that amorphous micro-particles’ formation, growth and aggregation can be observed clearly by the microscope with the increasing of time at 425℃. Resins and asphaltenes contents in two visbroken oils are both decrease. Compared to conventional visbreaking process, hydrogen donor in hydrogen donor visbreaking process can inhibit the growth of amorphous micro-particles to postpone the phase separation. Moreover, hydrogen donor can inhibit the coke formation and improve the stability of visbroken oil.