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Method for detecting No.120 solvent naphtha in light stabilizer-123

A detection method, solvent oil technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of unsuitable industrial production, high cost, and hysteresis, and achieve high accuracy and easy operation Fast, efficient and repeatable results

Inactive Publication Date: 2021-11-16
河北中科同创科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are following defects when utilizing gas chromatography to analyze No. 120 solvent oil in light stabilizer: the one, the detection time of measuring solvent oil content is long, takes about 1 hour, has hysteresis, can not meet the requirement of guiding industrialized production; Second, gas chromatographic instruments are required to be used during the experiment, and the cost is too high

Method used

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  • Method for detecting No.120 solvent naphtha in light stabilizer-123
  • Method for detecting No.120 solvent naphtha in light stabilizer-123

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Standard sample preparation: take No. 120 solvent oil standard sample (1000mg / kg), and use xylene as a solvent to prepare the concentration of 4mg / kg, 8mg / kg, 10mg / kg, 20mg / kg, 50mg / kg respectively No. 120 solvent oil standard solution.

[0048](2) ATR method for measuring standard samples: ATR method is used to carry out infrared scanning on standard samples, with xylene as the background, and the scanning range is 600cm -1 ~4000cm -1 between.

[0049] (3) Select the characteristic infrared band: the band is 2500cm -1 ~3000cm -1 .

[0050] (4) draw standard curve: select 2500cm -1 ~3000cm -1 2930cm in the band -1 For the absorbance at the wavelength, draw a positive correlation curve between the absorbance and the concentration of the standard solution, and the correlation coefficient R value is 0.9997.

[0051] (5) Pretreatment of the light stabilizer-123 to be tested: put 1.0005g of the light stabilizer-123 to be tested in a three-neck round-bottomed flas...

Embodiment 2

[0055] (1) Standard sample preparation: take No. 120 solvent oil standard sample (1000mg / kg), and use xylene as a solvent to prepare the concentration of 4mg / kg, 8mg / kg, 10mg / kg, 20mg / kg, 50mg / kg respectively No. 120 solvent oil standard solution.

[0056] (2) ATR method for measuring standard samples: ATR method is used to carry out infrared scanning on standard samples, with xylene as the background, and the scanning range is 600cm -1 ~4000cm -1 between.

[0057] (3) Select the characteristic infrared band: the band selected by scanning spectrum is 2700cm -1 ~3200cm -1 .

[0058] (4) draw standard curve: select 2700cm -1 ~3200cm -1 2930cm in the band -1 For the absorbance at the wavelength, draw a positive correlation curve between the absorbance and the concentration of the standard solution, and the correlation coefficient R value is 0.9991.

[0059] (5) Pretreatment of the light stabilizer-123 to be tested: put 1.0005g of the light stabilizer-123 to be tested in a...

Embodiment 3

[0063] (1) Standard sample preparation: take No. 120 solvent oil standard sample (1000mg / kg), and use xylene as a solvent to prepare the concentration of 4mg / kg, 8mg / kg, 10mg / kg, 20mg / kg, 50mg / kg respectively No. 120 solvent oil standard solution.

[0064] (2) ATR method for measuring standard samples: ATR method is used to carry out infrared scanning on standard samples, with xylene as the background, and the scanning range is 600cm -1 ~4000cm -1 between.

[0065] (3) Select the characteristic infrared band: the band is 2500cm -1 ~3200cm -1 .

[0066] (4) draw standard curve: select 2500cm -1 ~3200cm -1 2930cm in the band -1 For the absorbance at the wavelength, draw a positive correlation curve between the absorbance and the concentration of the standard solution, and the correlation coefficient R value is 0.9996.

[0067] (5) Pretreatment of the light stabilizer-123 to be tested: put 1.0007g of the sample to be tested in a three-neck round bottom flask, and put it i...

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Abstract

The invention belongs to the technical field of substance analysis and detection, and provides a method for detecting No.120 solvent naphtha in a light stabilizer-123. The method comprises the following steps: carrying out infrared scanning on a series of No.120 solvent naphtha standard solutions with different concentrations, and screening out a characteristic infrared band; fitting the absorbance and the concentration of the series No.120 solvent oil standard solution to obtain a series model; taking the model with the maximum correlation coefficient as a detection model; fractionating the to-be-detected photostabilizer-123 to obtain the to-be-detected No.120 solvent naphtha; and performing infrared scanning on the to-be-detected No.120 solvent naphtha, and substituting infrared information of the to-be-detected No.120 solvent naphtha into the detection model. The deviation value between the result of the detection method and the detection result of the gas chromatography is + / -0.02%, which indicates that the detection method provided by the invention is good in repeatability, high in accuracy and simple, rapid and efficient to operate, and the analysis result has obvious guiding significance on quality control of the light stabilizer in the production process.

Description

technical field [0001] The invention relates to the technical field of substance analysis and detection, in particular to a method for detecting No. 120 solvent oil in light stabilizer-123. Background technique [0002] The production of light stabilizer-123 uses 2,2,6,6-tetramethylpiperidinol as the main raw material, which is produced through oxidation, free radical and transesterification reactions. Since a small amount of No. 120 solvent oil is added during the preparation of light stabilizer-123, the finished product generated after the reaction contains a small amount of No. 120 solvent oil. Fractional distillation is required to recycle No. 120 solvent oil and reduce the impact on subsequent processes. The residual No. 120 solvent oil in the light stabilizer-123 will affect the performance of the light stabilizer-123. At present, the general detection and analysis method in the industry is gas chromatography. But there are following defects when utilizing gas chroma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3577
CPCG01N21/3577
Inventor 郭强贺佩贾志军
Owner 河北中科同创科技发展有限公司