减压渣油与超临界亚组分的结构参数计算

CALCULATION OF STRUCTURAL PARAMETERS OF VACUUM RESIDUES AND THEIR SUB FRACTIONS BY SUPER CRITICAL FLUID EXTRACTION

用改进的Ｂｒｏｗｎ－Ｌａｄｎｅｒ方法计算了６种国内与２种国外减压渣油及其以正戊烷为溶剂、在超临界条件下切割出的各馏分的平均分子结构参数。结果表明，超临界流体对减压渣油分离效果很好，抽出油与抽余油的分子特征差异明显。沙特减压渣油的各项分子结构参数与辽河渣油相近，而阿曼减压渣油的总体性质与华北渣油相似。窄馏分的Ｈ／Ｃ比随馏分变重下降，芳炭率逐步上升。大港减压渣油的抽出油和抽余油的分子结构差异最为突出。

The average structural parameters of the residues of six Chinese and two foreign crude oils and their sub fractions were calculated based on their 1 H NMR spectra with modified Brown Ladner method. The results show that super critical fluid extraction has a good separation efficiency for vacuum residues. The molecular characteristics of extracts is differ from that of remainder oils obviously. Comparing most of the structural parameters, it can be conclude that Oman residue is pretty similar to Huabei residue and the same is Shate to Liaohe. The value of H/C atomic ratio of sub factions decreases with fraction becoming heavier, adversely, the value of f A increase. The molecular structure of Dagang residue has the greatest difference between its extract and remainder oil.