摘要
在渣油热反应体系中，凝聚态沥青质第二液相是焦的最直接物理化学前身物和制约渣油热转化过程经济性的关键因素。渣油组成对第二液相的形成特性具有最重要影响。将不同性质的渣油单油混合为配油，能够改善配油热反应体系中第二液相和焦的形成特性。在不同性质渣油单油的配油热反应体系中，与在相应的单油热反应体系中相比，第二液相的相分离点几乎总是提前，提前幅度由大至小的顺序是：化学第二液相＞化学物理第二液相＞物理第二液相；另一方面，在一定的热处理温度下，配油热反应体系中第二液相的相分离点随渣油配比的变化通常较小。特别是，当渣油单油的性质差别不大时，它们的配油热反应体系的相分离特性与单油热反应体系相当。
In the thermal reaction systems of vacuum residua, the second liquid phases of the condensed asphaltenes are the direct precursors of coke, and thus are the key restraints for the economic thermal conversion of vacuum residua. Of the factors governing the formation characteristics of the second liquid phases in the thermal reaction systems of vacuum residua,the composition of vacuum residua is the most important. Blending of individual vacuum residue with different composition into formulated vacuum residua can alter the formation characteristics of the second liquid phases and the coke. The onset points of the second liquid phases come always earlier in the thermal reaction systems of formulated vacuum residua than in those of the individual vacuum residue. In decreasing order of their advancement the phases are: the chemical, the chemi-physical and the physical second liquid phases. That the change of the onset points of the second liquid phases with the blending ratio of the formulated vacuum residua is scarcely discernible at given heat treatment temperatures. In particular, when the properties of the formulated vacuum residua exhibit little difference,the phase separation behavior in the thermal reaction systems of formulated vacuum residua matchs those in the thermal reaction system of either of the blending vacuum residue.
出处
《石油化工高等学校学报》
EI
CAS
1998年第2期1-4,共4页
Journal of Petrochemical Universities
基金
国家自然科学基金
关键词
热裂化
第二液相
配油
渣油
Heavy oils
Thermal cracking
The second liquid phase
Formulated vacuum residua
Coke formation
