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Method for measuring methanol content in methanol gasoline

A methanol content, methanol gasoline technology, applied in the direction of measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problems of measurement waste liquid, unsuitable, polluting the environment, etc., to improve robustness, Fast and accurate measurement, the effect of reducing errors

Inactive Publication Date: 2012-07-18
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Gas chromatography has a short measurement time and high precision, but the method requires complex experimental instruments and high requirements for the experimental environment. At the same time, it will generate measurement waste liquid and pollute the environment. It is not suitable for industrial on-line analysis and field environmental measurement requirements.

Method used

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  • Method for measuring methanol content in methanol gasoline
  • Method for measuring methanol content in methanol gasoline
  • Method for measuring methanol content in methanol gasoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: Here, 11 of the 21 samples are randomly selected as standard samples, and the remaining 10 are used as prediction samples. The number of PLS ​​principal factors is 6. The results obtained in a certain experiment are as follows Figure 5 shown.

Embodiment 2

[0053] Embodiment 2: Utilize 10 methanol gasoline samples and pure methanol samples that 90# hydrocarbon gasoline is distributed, totally 11 samples are used as standard sample building model, then use 10 methanol gasoline samples that 93 hydrocarbon gasoline# distributes as prediction samples, The number of PLS ​​principal factors is 6, and the obtained results are as follows Image 6 shown.

Embodiment 3

[0054] Embodiment 3: Utilize 10 methanol gasoline samples that 93# hydrocarbon gasoline distributes and pure methanol sample, a total of 11 samples are used as standard sample model building, then use 10 alcohol gasoline samples that 90# hydrocarbon gasoline distributes as predictive samples, The number of PLS ​​principal factors is 6, and the result is as follows Figure 7 shown.

[0055] Table 1 shows the results of Examples 1-3 of the present invention, which show that the method of the present invention has high prediction accuracy and robustness.

[0056] Table 1 Prediction results of the rapid measurement method for methanol content in the whole range

[0057] Testing method R 2 SEP Embodiment 1: 11 random samples are used as standard samples 0.9990 0.6560 Example 2: 10 samples of 90# + pure methanol samples are used as standard samples 0.9990 0.5867 Example 3: 10 samples of 93# + pure methanol samples are used as standard samples 0.9...

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Abstract

The invention discloses a method for measuring the methanol content in methanol gasoline, which comprises the following steps: firstly, a near-infrared measuring system is utilized to obtain the near-infrared spectroscopic data of a standard sample, then integer interpolation is carried out on a spectrum, and the baseline of each spectrum is found out and removed; secondly, the characteristic peak of unsaturated hydrocarbon in the gasoline component is utilized for normalization, so the influence which is generated by different base oil in the methanol gasoline to the spectrum is overcome; and finally, the normalized spectrum is applied, and the characteristic peak of the methanol is combined to built a model. In the test period, after the spectroscopic data of an unknown test sample is obtained, the spectrum pretreatment is also carried out according to the method, and finally, the built model is utilized to pretest on the basis of the standardized spectrum. The method not only can quickly and accurately measure the methanol content in the methanol gasoline, but also can effectively reduce the measurement error which is caused by gasoline component variation, so the measurement stability is improved.

Description

technical field [0001] The invention relates to oil product detection technology, in particular to a method for rapidly detecting methanol content in methanol gasoline by using near-infrared spectroscopy. Background technique [0002] Due to the increasing shortage of oil resources, the contradiction between oil supply and demand continues to increase, and oil prices are also soaring all the way, forcing countries all over the world to speed up the development of new alternative energy sources. Methanol mixed with a certain proportion of gasoline has been widely used as an alternative energy source for vehicles. Applications. The advantage of blending methanol is that it can effectively increase the octane number of gasoline, and at the same time make gasoline burn more completely, increase combustion efficiency, improve economy, and reduce air pollution. The disadvantage is that methanol has a low calorific value. When methanol is mixed in a large amount with gasoline, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/3577G01N21/359
Inventor 戴连奎黄承伟
Owner ZHEJIANG UNIV