摘要
采用柱色谱和阴离子交换树脂法分离出原油200～420℃馏分中的羧酸,通过红外光谱仪检验分离效果及分离出的羧酸的类型。采用气相色谱及以异丁烷为反应气的化学电离(CI)质谱法分析分离出的羧酸。在对其结构进行推断和归类中,以纯脂肪酸、环烷酸以及分离出的石油酸的CI质谱数据为基础,结合环烷酸z系列通式CnH2n+zO2,分别得到了不同碳数的脂肪酸及一环、二环……六环环烷酸的分析结果。结果表明,含酸原油中的羧酸主要是环烷酸,相对分子质量分布为170～510,碳数分布为C10～C35,其中双环、三环环烷酸含量较高。
The petroleum carboxylic acids in 200-420 ℃ distillate of crude oil were separated by the extraction with column chromatography on an anion exchange resin. The effect of the composition and structure of naphthenic acids on separation were studied by the infra-red (IR) spectroscopic techniques. Naphthenic acids and iso-butane reagent gas were introduced into the ion source for chemical ionization, in which the ions represented by [M+C_4H_9]^+ were used to calculate the relative molecular mass for each acid. Based on the mass spectra of pure fatty and naphthenic acids, in combination with the z-series formula C_nH_(2n+z)O_2, the naphthenic acids can be classified into fatty, mono-, bi- … hexa-cyclic types. The results indicated that the relative molecular mass range of naphthenic acids in this distillates was 170-510, and the carbon number range was C_(10)-C_(35). The contents of bi-cyclic and tri-cyclic naphthenic acids were higher than others.
出处
《色谱》
CAS
CSCD
北大核心
2004年第3期220-223,共4页
Chinese Journal of Chromatography
关键词
气相色谱
质谱
电子轰击
化学电离
环烷酸
碳数分布
馏出液
原油
gas chromatography
mass spectrometry
electron impact
chemical ionization
naphthenic acid
carbon number distribution
distillate
crude oil
