负离子电喷雾-傅里叶变换离子回旋共振质谱分析辽河原油中的环烷酸  

Detailed Molecular Characterization of Naphthenic Acids in Liaohe Crude Oils by Negative Ion Electrospray Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

作　　者：史权[1] 侯读杰[1] 陆小泉[2] 周寅驰[2] 赵锁奇[2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石油大学(北京)重质油国家重点实验室,北京102200

出　　处：《分析测试学报》2007年第z1期317-320,共4页Journal of Instrumental Analysis

摘　　要：Naphthenic acids (NAs) are complex mixtures of carboxylic acids that are responsible for the corrosivity of the crude oil with high total acid number(TAN).NAs are difficult to analyze due to their complexity and the lack of commercially available NA standards.This paper describes the use of negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) for the analysis of NAs in Liaohe heavy crude oil.FT-ICR MS resolves thousands of species in a single mass spectrum allowing for unambiguous determination of elemental composition.O2 classes (with two O heteroatoms in one molecule) and their carbon number (revealing the extent of alkylation) distribution were detailedly investigated.We find that 2-5 rings NAs is the dominate component of acidic compounds in Liaohe crude oil,espasically with a high abundance of steroid acids and hopanoic acids.Neg-ESI-FTMS is very well suited to the characterization of naphthenic acids within a crude oil sample.Determination of the nature of the naphthenic acids present provides vital information,such as the acids’ sizes and composition.Naphthenic acids (NAs) are complex mixtures of carboxylic acids that are responsible for the corrosivity of the crude oil with high total acid number(TAN).NAs are difficult to analyze due to their complexity and the lack of commercially available NA standards.This paper describes the use of negative-ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) for the analysis of NAs in Liaohe heavy crude oil.FT-ICR MS resolves thousands of species in a single mass spectrum allowing for unambiguous determination of elemental composition.O2 classes (with two O heteroatoms in one molecule) and their carbon number (revealing the extent of alkylation) distribution were detailedly investigated.We find that 2-5 rings NAs is the dominate component of acidic compounds in Liaohe crude oil,espasically with a high abundance of steroid acids and hopanoic acids.Neg-ESI-FTMS is very well suited to the characterization of naphthenic acids within a crude oil sample.Determination of the nature of the naphthenic acids present provides vital information,such as the acids' sizes and composition.

关 键 词：FTMS High resolution mass spectrometry Naphthenic acids 

分 类 号：O657-55[理学—分析化学]