Raman spectrum superposition-based method for quickly determining content of methanol in methanol gasoline

Abstract

The invention discloses a Raman spectrum superposition-based method for quickly determining the content of methanol in methanol gasoline. The Raman spectrum superposition-based method comprises the following steps of: firstly, measuring a base oil spectrum, a pure methanol spectrum and a methanol gasoline spectrum with known methanol content; secondly, obtaining a spectrum superposing formula according to data and storing base oil and a corresponding spectrum superposition parameter in a spectrum database; and constructing the spectrum database and then estimating the content of the methanol from the methanol gasoline spectrum with the unknown methanol content by using the spectrum superposition formula. The invention provides the spectrum superposition formula from a view of spectrum soft processing as well as the formula-based method for quickly determining the content of the methanol in the methanol gasoline. According to the method, the quantity of samples required to be calibrated can be greatly reduced in the application process, the labor capacity of calibrating works is reduced and the problem that the measurement for low-content methanol is inaccurate or even cannot be measured in the traditional method is overcome; and in addition, the measurement precision of the unknown methanol gasoline prepared from the base oil can also be maintained.

Description

technical field [0001] The invention belongs to the field of chemometrics, and relates to a method for measuring spectra of substances in a mixture, in particular to a method for measuring methanol content in methanol gasoline. Background technique [0002] With the rapid development of my country's economy and the rapid increase of automobile usage, the demand for gasoline in the domestic market has increased rapidly, which has brought enormous pressure to my country's oil supply and environmental protection. The only way to change oil shortage and severe environmental pollution is to reduce dependence on oil and develop green, efficient and clean alternative energy sources. As a substitute for ordinary gasoline, methanol gasoline is a path of "replacing oil with coal", which can directly replace ordinary gasoline. While alleviating the shortage of gasoline supply, it has good environmental protection benefits and is conducive to the sustainable development of the country's...

AI Technical Summary

Problems solved by technology

However, the main problem of these two types of methods is that it is necessary to collect a large number of training samples of different base oils and methanol content, so as to ensure the detection accuracy of the methanol content of the oil to be tested.

At the same time, due to the molecular absorption characteristics of near-infrared spectroscopy, the measurement results are easily interfered by other alcohols

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