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Method for rapidly determining component content of nitric acid and sulfuric acid through Raman spectrum

A nitric-sulfur mixed acid and Raman spectroscopy technology, applied in the field of analysis, can solve the problems of tediousness and determination of the content of nitric-sulfur mixed acid components, and achieve the effects of good determination accuracy, reduction of sample dosage, and easy and fast operation.

Pending Publication Date: 2022-03-01
XIAN MODERN CHEM RES INST
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Problems solved by technology

[0004] Aiming at the deficiencies and defects of the prior art, the present invention provides a method for rapidly determining the content of nitric-sulfur mixed acid components through Raman spectroscopy, so as to solve the cumbersome technical problem of the content determination of nitric-sulfur mixed acid components in the prior art

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  • Method for rapidly determining component content of nitric acid and sulfuric acid through Raman spectrum
  • Method for rapidly determining component content of nitric acid and sulfuric acid through Raman spectrum
  • Method for rapidly determining component content of nitric acid and sulfuric acid through Raman spectrum

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Embodiment 1

[0044] Collect nitric-sulfur mixed acid samples from different batches and different sampling areas in the nitrification process, and collect the laser Raman spectrum of the samples, specifically including: take 2-5ml nitric-sulfur mixed acid samples to be tested and seal them in transparent glass sample bottles, At an ambient temperature of 22-27°C, the spectrum of the nitric-sulfur mixed acid sample was collected using a Zhuo Lihanguang find edge portable Raman spectrometer. The wavelength of the laser light source selected by the Raman spectrometer is 785nm, and the scanning range is 180-2000cm -1, the exposure time of the sample is 0.03s, and the laser Raman spectrum of the sample is tested through non-immersion measurement, and the collected results are as follows figure 1 shown. In this embodiment, a total of 35 groups of nitric acid mixed acid samples with different proportions of nitric acid and sulfuric acid were selected, and each group of samples was repeatedly test...

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Abstract

The invention discloses a method for rapidly determining the content of nitric acid and sulfuric acid components through Raman spectroscopy, which comprises the following steps: collecting the laser Raman spectrum of a nitric acid and sulfuric acid mixed acid sample with known nitric acid or sulfuric acid component content, and pretreating the collected laser Raman spectrum; setting a characteristic wave number set for component content detection, and constructing a prediction model by adopting a partial least squares regression method and a multiple linear regression method according to the relationship between the Raman spectrum intensity corresponding to the characteristic wave number set of the nitric acid and sulfuric acid mixed acid sample and the known nitric acid content or sulfuric acid content; and obtaining the Raman spectrum of a to-be-detected nitric acid and sulfuric acid sample with unknown component content, performing pretreatment, extracting the Raman spectrum intensity corresponding to the characteristic wave number set, substituting the Raman spectrum intensity into the prediction model, and calculating the content of the nitric acid component or the sulfuric acid component in the to-be-detected nitric acid and sulfuric acid mixed sample. According to the method, the content of nitric acid and sulfuric acid components can be determined quickly, and the danger in the testing process is reduced.

Description

technical field [0001] The invention belongs to the technical field of analysis, and in particular relates to a method for quickly measuring the content of nitric-sulfur mixed acid components through Raman spectroscopy. Background technique [0002] As an excellent plasticizer, nitrate esters are widely used in the field of double-base propellants and composite propellants due to their better oxygen balance, good combustion and explosive properties. It is not only a good plasticizer for nitrocellulose, but also an indispensable and important component in propellants. Especially in the high-energy nitrate plasticized polyether (NEPE) propellant with the highest energy level, butanetriol trinitrate (BTTN) and nitroglycerin (NG) are important plasticizers in the form of mixed nitrates. use. At present, for nitrate products containing NG and BTTN, the synthesis route mostly adopts the method of direct nitration of alcohol, that is, alcohol and nitric acid are used as reactants...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 刘可任春燕潘清陈智群柳恒常海张皋王民昌栾洁玉张丽涵
Owner XIAN MODERN CHEM RES INST
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