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Method for determining alpha-, beta- and gamma- cellulose contents in dissolving pulp

A technology of cellulose content and dissolving pulp, which is applied in the field of pulp and paper making industry, can solve the problems that the β- and γ-cellulose content of dissolving pulp cannot be measured, and achieve the effect of fast measurement speed, high accuracy and easy operation

Inactive Publication Date: 2016-05-11
SOUTH CHINA UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

Furthermore, this method does not determine the β- and γ-cellulose content of dissolving pulp

Method used

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  • Method for determining alpha-, beta- and gamma- cellulose contents in dissolving pulp
  • Method for determining alpha-, beta- and gamma- cellulose contents in dissolving pulp
  • Method for determining alpha-, beta- and gamma- cellulose contents in dissolving pulp

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Embodiment

[0030] (1) Sample pretreatment: Take two 2.0±0.05g (accurate to 1mg) samples to be tested and put them into two 150-mL beakers respectively, and add 20mL of 9.45% w / w to the beakers respectively and 17.5% w / w sodium hydroxide solution, then put the beaker into a constant temperature water bath (25±0.5°C), and repeatedly dip the sample with a flat glass rod. Then add 80 mL of sodium hydroxide solution with the same concentration as before to each beaker, and stir it. Finally, cover the beaker with a watch glass, and record the time from the first addition of sodium hydroxide to the end of the reaction process (also called mercerization process). After the reaction is over, take out the beaker, filter with a washed and air-dried glass filter and a suction filter flask, and collect the filtrate in a glass bottle with a cover.

[0031]Take 0.2mL of the filtrates obtained after mercerization of lye with different concentrations and add them to two headspace bottles respectively, a...

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Abstract

The invention discloses a method for determining the alpha-, beta- and gamma- cellulose contents in dissolving pulp. The specific method utilizes phase-inversion headspace gas chromatography to determine the alpha-, beta- and gamma- cellulose contents in the dissolving pulp and comprises the steps of 1 sample pretreatment; 2 establishment of a standard curve; 3, sample detection performed by adopting the headspace gas chromatography; 4, result calculation. The method utilizes a phase-inversion headspace gas chromatography analysis means to determine a chromatographic signal value of carbon dioxide converted after oxidation reaction of all components and indirectly obtain the alpha-, beta- and gamma- cellulose contents in the dissolving pulp and is high in determination speed, and analysis results are objective and accurate. The operation process is greatly simplified, the testing time is shortened, and objective and accurate detection results can be instantly presented on the spot. The method is especially suitable for analysis of large quantities of samples in a laboratory and timely monitoring of the alpha-, beta- and gamma- cellulose contents of a bleached pulp sample in a workshop of a plant.

Description

technical field [0001] The invention relates to the field of pulp and papermaking industry, in particular to a method for measuring α-, β- and γ-cellulose content in dissolving pulp. Background technique [0002] Dissolving pulp is a high-purity chemically refined pulp. It has high α-cellulose content (>90.0%), low hemicellulose content (<4.0%) and lignin and other impurities content (<0.5%). It is the raw material of various chemical products, and various cellulose products can be prepared by chemical or physical methods, such as qualitative and quantitative filter paper, various cellulose ethers, cellulose esters, etc. According to the strength of alkali solubility of each cellulose component in dissolving pulp, it can be divided into α-, β- and γ-cellulose. According to the definition in the literature, α-, β- and γ-cellulose represent undegraded cellulose, degraded cellulose and hemicellulose in pulp, respectively (Tappimethod, T203om-93). Among them, 17.5% w...

Claims

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Application Information

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IPC IPC(8): G01N30/02
CPCG01N30/02G01N2030/025
Inventor 何亮柴欣生
Owner SOUTH CHINA UNIV OF TECH
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