加氢处理光亮油中絮状物的组成分析

STUDY OF COMPOSITION OF FLOCCULE IN 120BS BRIGHT OIL

采用溶剂法分离并提纯了120BS加氢光亮油中的絮状物,测定了絮状物和脱絮状物光亮油的平均相对分子质量和模拟蒸馏曲线,采用气相色谱和核磁共振分析了絮状物的组成。结果表明:含絮状物120BS加氢光亮油中絮状物的质量分数为0.05%,絮状物对光亮油的性质基本没有影响,但对其外观影响较大;与脱絮状物光亮油相比,絮状物的平均相对分子质量高,相同馏出温度时馏出量小;絮状物含有质量分数为20.2%的正构烷烃,其余组分为具有一定异构化程度的异构烷烃和环烷烃;絮状物既含有凝点很高的高碳数正构烷烃、异构化程度较低的异构烷烃和环烷烃,又含有凝点略低、具有一定异构化程度的链烷烃和环烷烃。在宏观上,絮状物是微晶蜡和轻脱沥青油的蜡下油的混合物。

The floccule in 120BS bright oil was separated by solvent method. The structure and composition of the floccule was characterized by average molecular mass, simulated distillation, gas chromatography （GC） and nuclear magnetic resonance （13C-NMR）. The results show that the floccule does not affect the properties of the bright oil, but affect its appearance seriously, although the content of floccule is 0.05 ~/00 only. The floccule is characterized by its higher average molecular mass and higher simulated distillation temperature than the floccule-removed oil and is mainly composed of n-alkanes, iso-paraffins, and cyeloalkanes. Among of them, 20.2% is high carbon n-alkanes and the rest is/-paraf- fins and cycloalkanes with lower levels of isomers. All these components have higher freezing point. However, there are some n-alkanes and eycloalkanes with somewhat lower freezing point and low level isomerization in the floccule. At the industry level, the floccule is actually considered to be composed of a mixture of mierocrystal wax and loots oil.