沸腾床加氢原料油超临界萃取分离与结构研究

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,对窄馏分的组成分布和结构进行了研究,为STRONG沸腾床加氢原料的结构提供重要基础数据。结果表明,随着窄馏分收率的增加,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,残炭值、硫和氮及金属元素含量逐渐增加,氮和金属在最后几个窄馏分和残渣中有富集现象。用改进的Brown-Ladner法计算了各个窄馏分和原料的结构参数,预测了窄馏分的二次加工性能,对特征化参数与窄馏分的性质进行了关联。建立了伊朗和沙轻减压渣油混合油窄馏分残炭值、芳碳率、与特征化参数之间的关联式。

Study on supercritical extraction of ebullated bed hydrogenation feed and feed structure

The blended vacuum residue of Iran and Suaudi Arabia Light Crudes was separated into 6 nar- row fractions and a raffinate residue by supereritical fluid extraction and fractionation （SFEF） process. The group composition distribution and structure of narrow fractions were studied to provide important basic data for the study of feed＇ s structure of STRONG ebullated-bed hydrogenation. The results indicated that with increasing yield of narrow fraction, the mass percentage of saturates was reduced, the mass pereentage of resin was increased, and the mass percentage of aromatics gradually became higher. There was little asphaltenes, and carbon residue, sulfur, nitrogen and metals were increased. N2 and metals were concentrated in the last several fractions and residue. The structural parameters of narrow fractions and vacuum residuum were calculated with modified Brown-Ladner method. The perfbrmance of upgrading was predicted. The characteristic index KH correlated well with narrow fraction properties. The correlation among MCR, fA and KH of mixed vacuum residuum from Iran and Saudi Arabia Light in the narrow fractions were established.