基于拉曼光谱技术的车用汽油中芳烃烯烃快速测定技术研究

Research on Rapid Determination of Aromatics and Olefins in Automotive Gasoline Based on Raman Spectroscopy Technology

基于气相色谱技术的传统汽油组分分析方法,存在检测耗时长、设备操作比较复杂等不足,难以进行实时在线分析。汽油中的芳烃、烯烃含量是汽油产品优劣的重要指标,为实现汽油中所含芳烃、烯烃含量的快速测定,利用拉曼光谱法对92号、95号车用汽油样品进行分析检测,获得了汽油中碳氢化合物分子振动的信息,实现车用汽油中芳烃烯烃含量的快速测定。对汽油样品的拉曼光谱进行有效波段提取、基线扣除、分峰拟合等一系列预处理过程,最终提取出每个汽油样品光谱中芳烃、烯烃所对应的拉曼特征峰信息,利用气相色谱法测定汽油中芳烃、烯烃含量,并以此为基准值,再利用化学计量学多重回归分析方法,建立关联模型。利用建立的关联模型预测汽油中芳烃、烯烃含量。结果表明:芳烃预测值与基准值相关系数是0.99,烯烃预测值与基准值相关系数是0.99,进一步表明关联模型预测精度和准确度较好。

The rapid determination technology for the content of important components in gasoline can provide effective data for gasoline quality evaluation,which is of great significance for gasoline quality evaluation.The traditional gasoline component analysis method based on gas chromatography technology has shortcomings such as long detection time and complex equipment operation,making it difficult to conduct real-time online analysis.The content of aromatics and olefins in gasoline is an important indicator of the quality of gasoline products.In order to achieve rapid determination of the content of aromatics and olefins in gasoline,we use Raman spectroscopy was used to analyze and detect samples of 92#and 95#automotive gasoline,obtaining information on the vibration of hydrocarbon components in gasoline,and achieving rapid determination of the content of aromatics and olefins in automotive gasoline.A series of preprocessing processes were carried out on the Raman spectra of gasoline samples,including effective band extraction,baseline deduction,and peak fitting.Finally,the Raman characteristic peak information corresponding to aromatics and olefins in each gasoline sample spectrum was extracted.Gas chromatography was used to determine the content of aromatics and olefins in gasoline,and this was used as the reference value.Combined with chemometrics multiple regression analysis methods,a correlation model was established.Using The established correlation model was used to predict the content of aromatics and olefins in gasoline,.The results showed that the correlation coefficient between the predicted aromatics value and the reference value is was 0.99,and the correlation coefficient between the predicted olefins value and the reference value is was 0.99,which indicatesing that the prediction accuracy and precision of the correlation model are were good.