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A method for determining the content of lignocellulosic plant chemical components using a thermogravimetric analyzer

A technology of lignocellulose and thermogravimetric analysis, applied in measuring devices, analytical materials, instruments, etc., can solve problems such as affecting factory production, inability to analyze a small amount of samples, and untimely analysis results, achieving less labor and high work efficiency Effect

Active Publication Date: 2020-05-19
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This analysis alone requires 1-2 analysts and testers to work throughout the year, and due to the long analysis cycle, the untimely analysis results often affect the production of the factory
In addition, for the test and analysis of a sample, it needs to consume about 20g of raw materials to obtain all the chemical composition data. On the one hand, the consumption of a large number of samples increases the analysis cost and the burden of the analysis and testing personnel; on the other hand, it cannot analyze a small number of samples.

Method used

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  • A method for determining the content of lignocellulosic plant chemical components using a thermogravimetric analyzer
  • A method for determining the content of lignocellulosic plant chemical components using a thermogravimetric analyzer
  • A method for determining the content of lignocellulosic plant chemical components using a thermogravimetric analyzer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Taking wood raw materials as an example

[0064] 60 parts of wood raw materials were selected, among which: 25 parts came from Linyi, Shandong, 15 parts came from Guiyang, Guizhou, and 20 parts came from Changsha, Hunan; samples were made respectively, and the weight of each sample was 50g.

[0065] All the samples were dried at 105°C and pulverized, passed through a 40-mesh sieve to obtain sample powder, each sample was about 30g, and then divided into two parts, one part (20mg) for thermogravimetric analysis, and the other part (30g) for wet chemical analysis ;

[0066] Such as figure 1 As shown, the calibration sample set and the collection of the thermogravimetric curve of the sample to be tested: Weigh about 20 mg of the sample, put it into the thermogravimetric analyzer for thermogravimetric analysis, and collect the thermogravimetric curve. , the temperature is raised at 5°C / min, the temperature rises to 900°C, the temperature is stopped, and the temperature is...

Embodiment 2

[0081]Taking the kenaf plant as an example, 80 parts of kenaf raw materials were selected, of which 40 parts were produced in Hunan, 20 parts were produced in Shandong, and 20 parts were produced in Xinjiang; samples were made respectively, and the weight of each sample was 50g.

[0082] All the samples were dried at 105°C and pulverized, passed through a 40-mesh sieve to obtain sample powder, each sample was about 30g, and then divided into two parts, one part (20mg) for thermogravimetric analysis, and the other part (30g) for wet chemical analysis ;

[0083] Such as figure 1 As shown, the calibration sample set and the collection of the thermogravimetric curve of the sample to be tested: Weigh about 20 mg of the sample, put it into the thermogravimetric analyzer for thermogravimetric analysis, and collect the thermogravimetric curve. , the temperature is raised at 5°C / min, the temperature rises to 900°C, the temperature is stopped, and the temperature is lowered with liquid...

Embodiment 3

[0089] Taking corn plants as an example, 120 parts of corn stalk raw materials were selected, of which 40 parts were produced in Gaomi, Shandong, 40 parts were produced in Liaocheng, Shandong, and 40 parts were produced in Dezhou, Shandong; samples were made respectively, and the weight of each sample was 50g.

[0090] All the samples were dried at 105°C and pulverized, passed through a 40-mesh sieve to obtain sample powder, each sample was about 30g, and then divided into two parts, one part (20mg) for thermogravimetric analysis, and the other part (30g) for wet chemical analysis ;

[0091] Such as figure 1 As shown, the calibration sample set and the collection of the thermogravimetric curve of the sample to be tested: Weigh about 20 mg of the sample, put it into the thermogravimetric analyzer for thermogravimetric analysis, and collect the thermogravimetric curve. , the temperature is raised at 5°C / min, the temperature rises to 900°C, the temperature is stopped, and the t...

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Abstract

The invention relates to a method for determining content of a chemical composition of a lignocellulose plant by adopting a thermogravimetric analysis meter. The method comprises the following steps: performing programmed temperature rise treatment on a corrected sample set by adopting the thermogravimetric analysis meter, thereby acquiring a thermogravimetric curve of the corrected sample set; determining a target index content of the corrected sample set according to a standard method and taking the target index content as a reference value; combining the thermogravimetric curve of the corrected sample set with the reference value by adopting a partial least squares method to establish a correcting model; substituting the thermogravimetric curve of a to-be-determined sample into the correcting model and calculating, thereby acquiring the target index content of the to-be-determined sample. Compared with the conventional wet chemical analysis, the method provided by the invention has the characteristics of short time, high speed, accurate analysis result, less quantity demand of the sample, and the like. According to the method provided by the invention, the problems of complex steps, long time, high cost and low efficiency of the traditional analysis method can be effectively solved, and the microanalysis and batch-analysis can be performed.

Description

technical field [0001] The invention relates to a mathematical model related to the content of phytochemical components and their thermogravimetric curves obtained through stoichiometric modeling in the process of analyzing lignocellulose phytochemical components, using this model to analyze the thermogravimetric curves of samples to be tested, quickly A method for obtaining the content of its chemical components, the analysis method requires less samples, and the analysis is fast and accurate, and belongs to the field of analysis and testing of lignocellulosic plants. Background technique [0002] The determination of the chemical composition of lignocellulosic plants is a necessary prerequisite for the rational use of plant resources, the correct evaluation of their use value and processing methods, and their effective application in textile hemp degumming, paper pulping, and bioethanol fermentation pretreatment. [0003] Conventional phytochemical component content testin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00
CPCG01N5/00
Inventor 姜伟韩光亭周成凤张元明邢美毅
Owner QINGDAO UNIV
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