减压渣油超临界萃取分离与结构研究

减压渣油结构复杂,其合理利用应以充分了解其结构为基础。采用超临界流体萃取分馏技术,将伊朗和沙轻减压渣油混合油分离成6个窄馏分和1个萃余残渣,测定各窄馏分的性质和组成,为沸腾床加氢原料的结构表征提供重要基础数据。结果表明,随着窄馏分产率的增加,残炭值、S和N及金属元素含量逐渐增加,饱和分质量分数减小,胶质质量分数增大,芳香分质量分数逐渐增大,各窄馏分中基本不含沥青质。用改进的Brown-Ladner法计算了各个原料和窄馏分的结构参数,对窄馏分的二次加工性能进行了预测。

Supercritical Fluid Extraction and Fractionation of Vacuum Residue and Study on Structure of Vacuum Residue

Due to its composition complexity,rational application of vacuum residue must be based on the full understanding of its properties and structure.Mixed oil of light vacuum residues from Iran and Saudi Arabian was separated into 6 narrow fractions and an end-cut by supercritical fluid extraction and fractionation(SFEF) technology.Properties and compositions of narrow fractions were determined,which provided important basic data for structure characterization of ebullated bed hydrogenation feedstock.The results indicate that as the yield of narrow fraction increases,contents of S and N increase as well as metal content and the value of residual carbon;When the fraction becomes heavier,contents of saturates and of resins decrease,aromatics content gradually increases,there is little asphaltene in every narrow fraction.The average structural parameters of narrow fractions and vacuum residuum were calculated with modified Brown-Ladner method.The characteristic index(KH) was used to assess process capability.