Prediction Method of Benzene Content in Gasoline Based on Raman Spectroscopy Analysis Technology
A technology of Raman spectroscopy and prediction methods, applied in Raman scattering, material excitation analysis, etc., can solve problems such as difficulty in guaranteeing extrapolation of regression models, difficulties, and increased practical applications
Active Publication Date: 2018-05-08
CHINA PETROLEUM & CHEM CORP +1
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However, since the collection of training samples requires a lot of time and economic overhead, and the extrapolation of the established regression model is difficult to guarantee, once the measurement environment and the composition of the measurement objects change, it is likely to need to re-collect samples for model reconstruction , these all add difficulties to the practical application
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[0030] The invention provides a method for predicting the benzene content of gasoline based on Raman spectral analysis technology, comprising: step S1, collecting training samples, the benzene volume content of the training samples is known; step S2, measuring the Raman of the training samples Spectrum; step S3, preprocessing the measured Raman spectrum; step S4, obtaining an intercepted spectrum segment from the preprocessed Raman spectrum, the intercepted spectrum segment includes the wave number of the characteristic peak of benzene, And apply the Raman spectral analysis technique to decompose the described cut-out spectrum section of each described training sample, obtain the characteristic peak and interference peak of the benzene of this training sample; Step S5, from the described training sample of each sample Deducting the respective interference peaks from the intercepted spectrum to obtain the characteristic spectrum of benzene in each sample in the training sample; ...
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Abstract
The invention discloses a method for predicting the benzene content of gasoline based on Raman spectrum analysis technology. The method firstly collects training samples and measures their Raman spectra, preprocesses the measured Raman spectra and selects the characteristic spectrum of benzene components. In this region, the interference peaks produced by other components in gasoline overlap with the characteristic peaks of benzene components, which will lead to a decrease in the prediction accuracy of the model. For this purpose, the spectral analysis technique is used to fit the interfering peaks and subtract them. Finally, the multiple regression method was used to establish a regression model between the characteristic spectrum of benzene and the volume content of benzene after deducting the interference peaks. The method disclosed in the invention utilizes spectral analysis technology to effectively solve the problem of overlapping signals of different components in the Raman spectrum, can significantly improve the accuracy of the analysis model, and has the advantages of less training sample demand, strong model extrapolation, and long analysis time. It is suitable for the online quantitative analysis and detection of benzene content in gasoline.
Description
technical field [0001] The invention relates to the field of quantitative analysis of chemical product components, in particular to the precise quantitative analysis of benzene components in gasoline by using Raman spectroscopy. Background technique [0002] Benzene is considered a carcinogen, which exists in gasoline and other chemical products. With the evaporation and / or incomplete combustion of gasoline and other chemical products, benzene will cause serious pollution to the atmosphere, so the benzene content in gasoline is strictly controlled. Control is an important part of the comprehensive treatment of motor vehicle exhaust pollution. Since December 31, 2009, my country has fully implemented the national Ⅲ quality index of motor gasoline (GB17930-2006), which strictly stipulates that the benzene content in gasoline should not exceed 1% by volume. It is stipulated that gas chromatography should be used to measure the benzene content in gasoline. [0003] The applicat...
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IPC IPC(8): G01N21/65
Inventor 李津蓉曾维俊戴连奎戴宝华黎金伟王拓孟鸿诚黄伯洪王斌贺雷
Owner CHINA PETROLEUM & CHEM CORP