大港减渣超临界萃取物的GC/MS定性、定量分析

Qualitative and Quantitative Analyses of GC/MS-detectable Species in Fractions from Supercritical Fluid Extraction of Dagang Vacuum Residue

超临界萃取可以在控制的温度和压力下把重油分成很多窄馏分以方便后续分析,从大港原油真空分馏得到的大港减渣被超临界萃取技术分成F1到F16个级分.用商品级的石蜡作为外标,用GC/MS对这些级分进行定性和定量分析,分析结果显示用其主要成分为C15到C43的直链烷烃,包含藿烷、萜烯和含氧有机化合物等,这些化合物的浓度从F1到F16明显减少.

Such a technique can separate heavy petroleum feedstocks （HPFs） into some narrow-cuts by controlling temperature and pressure,making subsequent analysis easier. Dagang vacuum residue （DVR） from vacuum distillation of Dagang crude oil,is separated into sixteen fractions denoted as F1 to F16 by SFE technique. The fractions is subject to qualitative and quantitative analyses with GC/MS using a commercially available paraffin as a reference standard. The results show that main components detected with GC/MS are normal alkanes from C15 to C43,and cycloalkanes including hopanes and terpanes along with small amounts of alkenes.,arenes and oxygen-containing organic compounds. The concentration of the compounds decreases remarkably from F1 to F16. HPLC/MS analysis will be conducted to understand molecular composition of heavier and more polar species in the fractions.