气相色谱法测定汽油馏分中的单体芳烃  

Determination of Detailed Aromatics in Gasoline by Gas Chromatography

作　　者：金珂[1] 杨海鹰[1] 

机构地区：[1]石油化工科学研究院,北京100083

出　　处：《色谱》2003年第1期85-87,共3页Chinese Journal of Chromatography

摘　　要：采用三柱一阀气相色谱系统单次进样、归一化法定量分析初馏至200℃的汽油(包括含有醇类、醚类的成品汽油)中的芳烃含量。具体操作:样品进入系统后分为两路,一路经过分析柱1(Col 2)后直接到检测器;另一路进入预切柱(Col 1),烷烃和烯烃先于芳烃流出,待烷烃和烯烃放空后将阀切换到反吹状态,Col 1中的芳烃被反吹出来,进入分析柱2(Col 3),经过分离后到检测器,经计算得到样品分析结果。该法简便、快速、样品用量少、测试范围宽,避免了汽油中其他组分对芳烃测定的干扰。Detailed aromatics in gasolines with boiling points up to 200 ℃ were determined in a single injection and fast analysis by gas chromatography. This method was also used for finished motor gasoline that contains oxygenates (alcohols and ethers) as additives. A threecolumn chromatographic system equipped with a columnswitching valve and a flame ionization detector was used. Upon injection, sample was split into two parallel channels, one going to an analytical column(Col2) that was connected to the detector directly, while the other going to a pretreatment column(Col1) where saturates and olefins eluted earlier than aromatics. In Col1, right after all components other than aromatics eluted, the switching valve was used to backflush the aromatics in the Col1 into another analytical column (Col3), in which aromatics were separated. Peak areas for the aromatics were measured and used to quantitate the aromatics. The total analysis time was about 40 min. The results were accurate and reproducible, thus the method is suitable for routine analysis. 

关 键 词：气相色谱法 芳烃 汽油 

分 类 号：O658[理学—分析化学]