Method for measuring gasoline olefin content based on Raman spectrum

Abstract

The invention discloses a method used for measuring the content of gasoline olefin on the basis of Raman spectra, sequentially comprising the steps as follows: the content of olefin in a training sample is measured by a fluorescent indicator adsorption method or a multidimensional gas chromatography; the Raman spectra of the training sample is measured; the measured Raman spectra is preprocessed by smooth filtration, benchmark line correction and standard normalization; a gasoline olefin content correction model is established by applying a least squares support vector machine on the Raman spectra of the preprocessed training sample and the measured olefin content; the Raman spectra of the oil sample to be measured is measured and the Raman spectra is preprocessed by smooth filtration, benchmark line correction and standard normalization; and the olefin content of the oil sample to be measured is calculated according to the correction model. The method combines the Raman spectra with the least squares support vector machine to analyze the content of the olefin in the gasoline, obviously improves the detection precision, greatly shortens the measurement time simultaneously, has no consumption of the sample during the measurement process, and has important significance on the quality control during the oil processing.

Description

technical field [0001] The invention relates to a method for measuring the olefin content of gasoline, especially a method for measuring the olefin content of gasoline by combining Raman spectrum and least square support vector machine. Background technique [0002] The hydrocarbon composition data of gasoline is an important indicator of gasoline products and an indispensable basic data in the petroleum refining process. Olefins in hydrocarbons, as unsaturated hydrocarbons, have good anti-knock properties, but poor thermal stability, which can easily block engine nozzles, affect engine combustion efficiency, and increase pollutant emissions. At the same time, due to the active chemical properties of olefins, NO after volatilization and in the atmosphere x Mixed, the sun's ultraviolet radiation forms toxic photochemical smog, causing serious pollution to the atmosphere. The national standard "Unleaded Gasoline for Vehicles" (GB17930-2006) stipulates that the content of aro...

AI Technical Summary

Problems solved by technology

However, due to the weak absorption of olefins in the near-infrared region, the measurement accuracy of this method is limited in practical applications.

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