摘要
采用气相色谱-红外(GC-IR)和气相色谱-质谱(GC-MS)技术分析热裂解汽油C5馏分中组分的结构。比较了用GC-IR与GC-MS确定热裂解汽油C5馏分中组分化学结构的优劣势。对于富含烯烃的热裂解汽油C5馏分,用GC-IR技术确定烯烃结构的准确性优于GC-MS。将GC-MS的电离能由70 eV降到10 eV,C5馏分中各组分分子离子峰的相对丰度和总离子流图中烯烃峰的相对丰度明显增加,有助于确定各组分的相对分子质量和属性。2种技术联用可起到互补作用,有利于确定化合物的结构。
The techniques of GC-MS and GC-IR were used to identify the structure of components in the C5 fraction from pyrolysis gasoline.A comparison of GC-MS technique with GC-IR technique was performed for determining the chemical structures of components in C5 fraction.GC-IR technique was superior to GC-MS technique when they were used to identify the structures of alkene isomers in C5 fraction.The relative abundance of molecular ion and alkene peaks in total ionic chromatography was increased obviously when ionizing voltage of MS was reduced from 70 eV to 10 eV.The technique of low ionizing voltage helped to determine the molecular weight of the components in C5 fraction.The simultaneous application of the two techniques provided the analyst with complementary structural information,thereby facilitated the characterization of complex samples.
出处
《石化技术与应用》
CAS
2011年第4期362-367,共6页
Petrochemical Technology & Application
