减压渣油与超临界亚组分的元素组成及SARA分析

ANALYSIS OF ELEMENTAL AND SARA COMPOSITION OF VACUUM RESIDUES AND THEIR SUB FRACTIONS BY SUPER CRITICAL FLUID EXTRACTION

用正戊烷为溶剂，在超临界条件下将６种国内与２种国外减压渣油分离成不同的宽馏分和窄馏分，测试了它们的残炭值、ＳＡＲＡ及元素组成。结果表明，渣油的残炭值与氢碳比密切相关；各种渣油的元素和化学组成的含量及分布是有差别的：镍倾向于分布在重组分中，孤岛和辽河渣油最为明显；大庆、华北渣油为低硫、高氮原油，氮和硫在渣油中分布平均；胜利、孤岛、沙特和阿曼是含硫原油，Ｎ／Ｓ原子比小于１，氮、硫在渣油中随馏分变重由小到大；大港、辽河渣油的氮大部分富集在重组分中；不同渣油的窄馏分ＳＡＲＡ组成变化规律基本类似。

Six Chinese and two foreign vacuum residues were separated into different fractions with n C 5 under critical condition. The carbon residue, SARA and elemental composition were measured. The results indicate that domestic vacuum residues have characteristics of high nitrogen and low sulfur content and the content of nickel is higher than that of vanadium. Saudi and Oman residues are high in aromatics and vanadium content, but their resin content is only equivalent to that of Daqing. The content and distribution of element and chemical composition are different among these residues. Nickel is present in heavy fraction, Gudao and Liaohe are the best examples. Daqing and Huabei crudes are high in nitrogen and low in sulfur content and their distribution is relatively smooth. Shengli、Saudi and Oman are sulfur containing crudes, the distribution of nitrogen and sulfur is known as varying from less to great as fraction becoming heavier and N/S atomic ratio is less than 1. Most of nitrogen in Dagang and Liaohe residues is present in heavy fraction. All the studied residues have almost the same distribution pattern law in SARA composition.