克拉玛依常压渣油悬浮床加氢裂化反应胶体性质

利用质量分数电导率法研究了克拉玛依常压渣油悬浮床加氢裂化在不同反应时间和反应温度下的胶体稳定性,并验证Yen T F渣油胶体结构模型。结果表明,克拉玛依常压渣油悬浮床加氢裂化体系的胶体稳定性在生焦诱导期内下降迅速,在生焦诱导期后下降趋于缓慢;反应温度的升高使体系胶体稳定性下降。从反应后产物的族组成及其数均相对分子质量探讨了体系胶体稳定性变化的原因。研究表明,随着反应的进行,克拉玛依常压渣油体系中作为分散介质的饱和烃和轻芳烃含量逐渐上升,作为胶溶剂的胶质含量显著下降,其可溶质相对分子质量均呈下降趋势;而作为分散相的沥青质质量分数及数均相对分子质量在生焦诱导期内上升,在生焦后开始下降。胶体体系族组成及数均相对分子质量的变化破坏了该体系原有的稳定结构,导致了体系胶体稳定性的下降。

Colloidal Properties During Slurry-Bed Hydrocracking Reaction of Kelamay Atmospheric Residue

Colloidal stability of Kelamay atmospheric residue(KLAR) during slurry-bed hydro-cracking reaction under the condition of different reaction time and temperature was studied by mass fraction normalized conductivity method,and the Yen T F colloidal structure model of residue was confirmed.It shows that the colloidal stability of KLAR during slurry-bed hydro-cracking reaction decreases rapidly in induction period of coke formation and then the decrease slows down after induction period of coke formation;when the reaction temperature rises,the colloidal stability of KLAR during slurry-bed hydrocracking reaction decreases.The reason for change of colloidal stability was explored through the measurement of group composition mass fractions and average relative molecular mass of reaction products in different time.The researches show that the contents of saturates and light aromatic increases,the content of resin decreases and the relative molecular mass of maltene decreases as the reaction progress;on the other hand,the group composition mass fraction and average relative molecular mass of asphaltene increase until coke formation occurred and then decrease.These changes jointly cause the deterioration of colloidal stability during slurry-bed hydro-cracking of residue and make the colloidal stability decrease.