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In-situ determination method of carbohydrate dissolution quantity of chemical pulp in cold alkali impregnation process

A carbohydrate, dipping process technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problem of distortion of results, and achieve the effects of high accuracy, simple operation, and objective and accurate results

Inactive Publication Date: 2017-05-10
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Because of the heterogeneity of the particle size of these particles, when the absorbance at a single wavelength is used to determine the dissolution rate, the results are often distorted.

Method used

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  • In-situ determination method of carbohydrate dissolution quantity of chemical pulp in cold alkali impregnation process
  • In-situ determination method of carbohydrate dissolution quantity of chemical pulp in cold alkali impregnation process
  • In-situ determination method of carbohydrate dissolution quantity of chemical pulp in cold alkali impregnation process

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Embodiment Construction

[0025] Combine below Figure 1 to Figure 4 Specific embodiments further specifically describe the present invention in detail. The present invention is not limited to the following embodiments.

[0026] Determination of Dissolution of Carbohydrates in Cold Alkali Impregnation Solution

[0027] (1) Sample ultraviolet-visible spectrum signal collection: regulating valve 1 (such as Figure 4 ), turn on the peristaltic pump, so that the cold alkali impregnation process liquid is pumped into the cuvette; after the liquid in the cuvette is full, start the UV spectrophotometer (light source, detector) to carry out the ultraviolet visible spectrometry on the cold alkali impregnation solution Detect, obtain the absorbance spectrogram under the characteristic wavelength of 450-850nm (as figure 1 );

[0028] (2) Carry out mathematical processing such as orthogonal signal correction and first-order derivative pretreatment on the absorbance spectra corresponding to various cold alkali ...

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Abstract

The invention discloses an in-situ determination method of carbohydrate dissolution quantity of chemical pulp in cold alkali impregnation process. The method comprises the following steps: (1) a peristaltic pump is used for pumping cold alkali filtrate into a flowing colorimetric ware; (2) real time monitoring is carried out for a sample solution by using UV / visible pectrophotometer; (3) mathematical treatment is carried out for absorbance spectrogram of obtained viscous liquid corresponding to a specific wavelength scope, and a corresponding prediction model is established; (4) detection can be carried out for the sample by using the UV / visible pectrophotometer; (5) a result is calculated and outputted. The method has the beneficial effects that the determination method of carbohydrate dissolution quantity of chemical pulp in the cold alkali impregnation process is used, and the method has simple operation, detection results can be given on the spot in the cold alkali impregnation process, and the result is objective and accurate.

Description

technical field [0001] The invention relates to the fields of pulping, papermaking and textile industry, in particular to a method for in-situ determination of carbohydrate dissolution in chemical pulp cold alkali immersion process. Background technique [0002] Cold soda impregnation, also known as cold soda extraction, refers to the process of soaking chemical pulp in cold lye and dissolving hemicellulose to obtain high-purity cellulose fibers in the chemical pulp refining process. Chemical pulp can only be used to prepare corresponding cellulose materials, such as making various regenerated fibers, plastic substitute films, etc., only after its purity reaches a certain value (usually the methyl fiber content is higher than 90.0%). High-purity chemical pulp can ensure higher product yield and lower consumption of derivatization reagents when preparing cellulose derivatives. Therefore, the purification of chemical pulp is crucial for its use in the manufacture of high valu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 何亮孙冰柴欣生
Owner SOUTH CHINA UNIV OF TECH