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A method and system for measuring mixed alcohol content

A method of determination and mixed alcohol technology, which is applied in the field of analysis and testing, can solve the problems of inability to directly inject samples, complicated measurement process, and high cost, and achieve the effects of reducing experimental work, simplifying the measurement process, and enhancing practicability

Active Publication Date: 2021-06-11
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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Problems solved by technology

The ratio of glycerol to triethylene glycol in the mixed alcohol can be determined by gas chromatography, liquid chromatography and other methods, but they cannot be directly injected, and a series of weighing, dilution, constant volume, etc. need to be carried out according to the conventional analysis steps. Sample pretreatment; complex measurement process, low efficiency and high cost

Method used

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  • A method and system for measuring mixed alcohol content
  • A method and system for measuring mixed alcohol content
  • A method and system for measuring mixed alcohol content

Examples

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Embodiment 1

[0113] Take pure glycerin and triethylene glycol in the mixed alcohol as an example. Such as figure 2 , image 3 They are the near-infrared spectra obtained by using the sample cell with an optical path of 1 mm and 10 mm, respectively. Although the wavelength range that can be measured with a 1mm sample cell is wider, and the spectral information obtained is more abundant, but because glycerin, triethylene glycol and mixed alcohol samples are very viscous, it is difficult to use a 1mm sample cell to inject samples. The bubbles formed in this way are not easy to get rid of, which will easily affect the accuracy of the spectrum. Spectra obtained using a 10mm sample cell figure 2 , the peak-to-peak absorbance is about 0.5, and the trough is 0.1, both of which are in the range of absorbance with small theoretical error. Therefore, the spectrum with an optical path of 10mm and a wavelength of 1100-1400nm is selected as the spectrum for measurement.

[0114] In order to simula...

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Abstract

The invention relates to a method and system for measuring the content of mixed alcohols. Based on the principle of spectral superposition, the near-infrared spectrum of pure samples is used to form the spectrum diagram of mixed alcohols through digital simulation, and the interference is reduced or eliminated by integral calculation, and then the simulated Spectral data use the least square method or partial least square method to establish a quantitative model of the content of glycerol and triethylene glycol in the mixed alcohol and the spectral data; this method does not need to prepare a series of standard solutions, and the measured samples do not need to be pretreated. Spectral testing can reduce a large amount of experimental work, and is suitable for rapid analysis and testing on the job site. The present invention greatly simplifies the measurement process, improves measurement efficiency, and significantly reduces costs. The method of the present invention is comparable in accuracy to gas chromatography, and has strong practicality.

Description

technical field [0001] The invention relates to a spectroscopic technique for quickly measuring the content of mixed alcohols in the synthesis of mixed nitrates, in particular to a method and system for measuring the content of mixed alcohols, and belongs to the technical field of analysis and testing. Background technique [0002] In order to improve the propellant energy and meet the mechanical performance requirements, it is necessary to use nitrates as energetic plasticizers. Commonly used nitrates include nitroglycerin (NG), nitroethylene glycol (EGDN), nitrated diethylene glycol (DEGDN), Nitrated triethylene glycol (TEGDN), butanetriol trinitrate (BTTN), etc., are often used in combination in actual formulations. Mixed alcohol refers to the mixture of glycerin and triethylene glycol, which is the main raw material for the synthesis of mixed nitrates. In the production process, generally by adjusting the ratio of glycerin and triethylene glycol in the mixed alcohol, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3577G01N21/359
CPCG01N21/3577G01N21/359
Inventor 程福银袁华郭欣徐娜白杰
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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