委内瑞拉奥里常渣减黏前后高分辨质谱解析

An analysis of visbreaking of Venezuela AR by ultrahigh-resolution Neg ESI FT-ICR MS

负离子电喷雾-傅里叶变化离子回旋共振质谱仪(Neg ESI FT-ICR MS)具有超高的分辨率,可用于分析重油中杂原子化合物的组成及分布。运用Neg ESI FT-ICR MS,研究委内瑞拉奥里常渣减黏裂化反应前后杂原子化合物,建立了分子组成的解析方法。结果表明,常渣中O2类化合物的相对丰度最大,减黏产物中N1类化合物的相对丰度最大。不同缩合度,质荷比小的O2类化合物减黏裂化反应后显著增加。委内瑞拉常渣及其减黏产物中相对丰度最强的O2类化合物均是双环环烷酸。减黏裂化反应使得O2类化合物发生了裂化反应,生成碳数更少、分子质量更小的化合物。

Negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry （Neg ESI FT-ICR MS） is used to analyze heteroatomic compounds and their distribution in heavy oil. An accurate molecules identification method has been established to obtain heteroatomic compounds transformations after the visbreaking of Venezuela AR. The results indicate that the highest relative abundance is O2 class in Venezuela AR and that of N1 in visbreaking product（VB）. Different condensation degree and the small m/z of O2 compound sharply increases after visbreaking. Bicyclic naphthenic acid is the main O2 compounds in Venezuela AR and VB, and the condensation degree of which is low. O2 compounds in Venezuela AR occur in cracking reaction and smaller carbon number and molecular weight compounds are generated then.