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Organic polymer solution concentration detecting method

A technology of polymer solution and detection method, which is applied in the fields of instruments, Raman scattering, analysis of materials, etc., can solve the problems of limited application, cumbersome, unsuitable for rapid detection or online monitoring, etc., and achieve the effect of rapid method.

Inactive Publication Date: 2009-06-17
ZHEJIANG UNIV
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Problems solved by technology

Although the specific gravity method has high measurement accuracy, it needs to be weighed many times by an analytical balance, which is too cumbersome and is not suitable for rapid detection or online monitoring; the optical rotation method is to detect the change law of polarized light intensity, which requires different components to have different optical rotations. The scope of application is greatly limited. At the same time, the polarimetric method still has the problem of low measurement accuracy; the spectrophotometric method is to detect the light transmittance, and the sensitivity is not high enough.
Chinese patent CN1062416 proposes to use ultrasonic waves to detect liquid concentration, but when there are bubbles or other impurities in the system, it will affect the detection results; Chinese patent application CN101216422 proposes a method for detecting solution concentration by detecting the refractive index of the solution, which has a high detection accuracy. Accuracy, but the detection instrument can only be placed outside the solution to be tested, which limits its application in pipeline measurement

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0065] The MultiRAM type Fourier Raman spectrometer produced by German Bruker Company is adopted, and the wavelength of the laser light source used in the spectrometer is 1064nm. Set the spectral scanning range of the spectrometer from 0 to 3600cm -1 , with a resolution of 10cm -1 . By non-immersion measurement, the Raman spectra of polystyrene-tetrahydrofuran solutions with different concentrations are detected to predict the concentration of polystyrene.

[0066] Taking the detection of polystyrene concentration in tetrahydrofuran solution as an example, the steps are as follows:

[0067] (1) Obtain 9 groups of Raman spectra of tetrahydrofuran-polystyrene solutions with different concentrations with FT Raman spectrometer, wherein the concentration is 0,0.3%, 0.6%, 1.2%, 1.5% and 2.4%wt THF-polystyrene Ethylene solution is used as a calibration sample, and tetrahydrofuran-polystyrene solutions with a concentration of 0.9%, 1.8% and 2.1% are used as samples to be tested;

...

Embodiment 2

[0095] The DXR intelligent Raman spectrometer produced by Thermo Fisher Company of the United States is adopted. The laser light source wavelength of the spectrometer is 780nm, and the spectral scanning range of the spectrometer is set to 0-3600cm -1 , with a resolution of 4cm -1 . The immersion online detection of Raman spectrum of polystyrene-toluene solution by industrial Raman optical fiber probe is used to predict the concentration of polystyrene.

[0096] Taking the detection of polystyrene concentration in toluene solution as an example, the steps are as follows:

[0097] (1) Use a laser Raman spectrometer, insert the industrial Raman optical fiber probe connected to the spectrometer into the pipeline, and detect the Raman spectrum of the polystyrene-toluene solution in the pipeline online, where the concentration is 0, 0.4%, 0.6%, 1.0 %, 1.3% and 2.0% wt of toluene-polystyrene solution as a calibration sample, the concentration of 0.8% and 1.6% of toluene-polystyrene...

Embodiment 3

[0120] The DXR intelligent Raman spectrometer produced by Thermo Fisher Company of the United States is adopted. The laser source wavelength of the spectrometer is 780nm, and the spectral scanning range of the spectrometer is set to 500-2000cm -1 , with a resolution of 0.5cm -1 , to predict the concentration of polystyrene by detecting the Raman spectra of polystyrene-chloroform solutions with different concentrations through non-immersion measurement.

[0121] Taking the detection of polystyrene concentration in chloroform as an example, the steps are as follows:

[0122] (1) Use a laser Raman spectrometer to obtain the Raman spectrum of the polystyrene-chloroform solution. The chloroform-polystyrene solutions with a concentration of 0, 0.5%, 1.0%, 1.5%, 2.0% and 2.5%wt were used as calibration samples, and the chloroform-polystyrene solutions with a concentration of 0.3%, 1.2% and 2.4% were used as samples to be tested. test sample;

[0123] (2) Determine that the spectru...

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Abstract

The invention discloses a concentration detection method of an organic polymer solution. The method comprises the following steps: obtaining a Raman spectrum of the organic polymer solution with the known concentration; preprocessing a Raman spectrum signal and then obtaining a predication model of the concentration of the organic polymer by a plurality of data processing methods such as a principal component regression method, a partial least square method and an artificial neural network; detecting and preprocessing the Raman spectrum of the organic polymer solution to be detected; and inputting the preprocessed Raman spectrum into the prediction model to calculate the concentration of the organic polymer solution. The method is characterized by being rapid, accurate, safe and environment-friendly, can be applied to on-line and off-line monitoring of the organic polymer and other related products in the production, modification, transportation and recovery processes.

Description

technical field [0001] The invention relates to the field of Raman spectrum detection, in particular to a Raman spectrum detection method for the concentration of an organic polymer solution. Background technique [0002] The methods currently available for detecting the concentration of organic polymer solutions include specific gravity method, optical rotation method, spectrophotometry, ultrasonic method and refractive index method, etc. Although the specific gravity method has high measurement accuracy, it needs to be weighed many times by an analytical balance, which is too cumbersome and is not suitable for rapid detection or online monitoring; the optical rotation method is to detect the change law of polarized light intensity, which requires different components to have different optical rotations. The scope of application is greatly limited. At the same time, the polarimetric method still has the problem of low measurement accuracy; the spectrophotometric method is u...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/65G01N2201/129
Inventor 王靖岱陈杰勋阳永荣
Owner ZHEJIANG UNIV
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