催化裂化油浆富芳分中间相沥青的流变性

Rheological properties of mesophase pitch derived from aromatics enriched fraction of catalytic cracking slurry

关键词:  流变性  催化裂化油浆  计状焦  沥青

Key words:  rheological property  catalytic cracking slurry  needle coke  pitch

摘要:

为了获得优质针状焦，考察了两种中间相沥青的组织结构与流变性的关系，以及二者的偏光显微组织结构、晶 格参数、非牛顿指数、粘流活化能的变化。结果表明:中间相的组织结构和晶格参数与剪切应力间互为因果关系；广 域流线性结构、晶体颗粒大且易于择优取向的中间相沥青’其温度敏感性强，温度平稳流动区宽，剪切降粘效果显 著;相比催化裂化油浆，催化裂化油浆富芳分制备的中间相沥青流变性更好，更有利于制备针状焦。

Abstract:

In order to get needle coke, the relations between textures and rheological properties of both mesophase pitches were investigated. The changes in polarized light micro-textures, crystal lattice parameters, non-Newtonian exponent as well as activation energy of viscous flow were studied. The results show that there were causal relationships between textures and lattice parameters and shear stresses. The mesophase pitch，with optically coarse fibrous texture and large crystal size as well as easily ordering, was of high temperature sensitivity，wide temperature scope of smooth flow, and remarkable shearing dilution. As compared with FCC slurry, mesophase pitch prepared from FCCRF slurry has better rheological properties, which would advantage to form needle coke.