Method for rapidly measuring content of trace methylbenzene in benzene based on Raman spectrum

A Raman spectroscopy and rapid determination technology, applied in the field of chemometrics, can solve the problems of complex equipment maintenance, complex operation, slow detection speed, etc., and achieve the effect of no loss of samples, simple operation and fast detection speed

Inactive Publication Date: 2015-07-15
ZHEJIANG UNIV
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Problems solved by technology

Although traditional gas chromatography has been applied to online detection, it has defects such as complicated operation, slow detection speed, and complicated equipment maintenance.

Method used

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  • Method for rapidly measuring content of trace methylbenzene in benzene based on Raman spectrum
  • Method for rapidly measuring content of trace methylbenzene in benzene based on Raman spectrum
  • Method for rapidly measuring content of trace methylbenzene in benzene based on Raman spectrum

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Embodiment

[0023] The Raman spectroscopy measurement platform used in this example is as follows: figure 1 As shown, the test conditions are: the laser is a Mars laser, the center wavelength is 785nm, and the spectrometer is a QceanOpticsQE650Pro spectrometer. The inventive method specifically comprises the following steps:

[0024] (1) Using pure benzene and toluene, prepare training samples and test samples containing different toluene mass fractions in benzene. The content of toluene in the training samples were 1000ppm, 800ppm, 400ppm, 200ppm, 100ppm and pure benzene, a total of 6 samples. The content of toluene in the test samples were 900ppm, 600ppm, 300ppm, 150ppm, a total of 4 samples.

[0025] (2) Use the Raman spectrum measurement platform to obtain the Raman spectrum of the training sample, and the Raman spectrum with an integration time of 2s is as follows: figure 2 shown, from figure 2 The Raman characteristic peak of benzene in the sample can be clearly seen in the sa...

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Abstract

The invention discloses a method for rapidly measuring the content of trace methylbenzene in benzene based on a Raman spectrum. The method comprises the following steps: preparing training samples by using benzene and methylbenzene, wherein the benzene in the training samples contains different contents of methylbenzene; measuring the Raman spectrums of the training samples; pretreating the Raman spectrums; selecting the Raman spectrums at methylbenzene characteristic peak wave bands, and establishing a quantitative calibration model of methylbenzene contents and Raman spectrum intensities by a linear regression method. According to the method, the Raman spectrum of the sample which is to be measured and has the unknown methylbenzene content is measured; the Raman spectrum is pretreated; the Raman spectrum at the methylbenzene characteristic peak wave bands is input into the quantitative calibration model, so that the predicted value of the methylbenzene content of the sample to be measured can be obtained. The method is simple and convenient to operate, high in detection speed, clean and environment-friendly, has higher measurement accuracy and better measuring repeatability, and is especially suitable for real-time and online detection for the content of the trace methylbenzene impurity in the industrial benzene production process.

Description

technical field [0001] The invention belongs to the field of chemometrics, and relates to a method for determining the content of impurities in chemical products, in particular to a method for rapidly determining the content of trace toluene in benzene. Background technique [0002] Benzene is an important basic organic chemical raw material, an important raw material for synthetic rubber, synthetic resin, synthetic fiber, synthetic medicine and pesticide, and can also be used as a solvent for power fuel, paint and rubber. The output of benzene and the level of production technology are one of the indicators to measure the development level of a country's petrochemical industry. The main processes of industrial production of benzene include catalytic reforming, toluene hydrodealkylation and toluene disproportionation. [0003] The national standard GB / T 3405-2011 stipulates the purity and impurity content of petroleum benzene: the purity (mass fraction) of petroleum benzene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 陈昀亮戴连奎
Owner ZHEJIANG UNIV
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