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Method for quickly determining content of alpha-cellulose in dissolving pulp

A technology for rapid determination of cellulose content, applied in the measurement of color/spectral properties, etc., can solve the problems of no physical meaning and the limitations of a large number of original sample models, and achieve the effect of shortening the test time, simple technical means and simplifying the operation process

Inactive Publication Date: 2015-05-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method not only has no clear physical meaning, but also requires a large number of original samples and the built model has great limitations.

Method used

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  • Method for quickly determining content of alpha-cellulose in dissolving pulp
  • Method for quickly determining content of alpha-cellulose in dissolving pulp
  • Method for quickly determining content of alpha-cellulose in dissolving pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Determination of α-cellulose content in eucalyptus and masson pine dissolving pulp

[0039] (1) Sample pretreatment: Accurately weigh a sample of eucalyptus or masson pine dissolving pulp equivalent to 2.50 g (accurate to 1 mg) of absolute dry weight in a beaker, and then add 25 mL of Sodium hydroxide solution, and then put the beaker in a constant temperature water bath, and use a flat glass rod to repeatedly immerse the sample for 2 to 3 minutes. Then add the remaining sodium hydroxide solution and stir it. Finally cover the beaker with a watch glass. It took 60 minutes from the first addition of sodium hydroxide to the end of the reaction. After the reaction was over, the beaker was taken out, and filtered with a washed and air-dried 30-mL 1G2 glass filter and a 250-mL suction filter flask, and the filtrate was collected in a glass bottle with a lid. The sample to be tested is dissolving pulp or pulp with negligible lignin content.

[0040] (2) Establish a standa...

Embodiment 2

[0048] Determination of α-cellulose content in dissolving pulp of unknown species

[0049] (1) Sample pretreatment: Accurately weigh a sample of eucalyptus or masson pine dissolving pulp equivalent to 2.50 g (accurate to 1 mg) of absolute dry weight in a beaker, and then add 25 mL of Sodium hydroxide solution, and then put the beaker in a constant temperature water bath, and use a flat glass rod to repeatedly immerse the sample for 2 to 3 minutes. Then add the remaining sodium hydroxide solution and stir it. Finally cover the beaker with a watch glass. It took 60 minutes from the first addition of sodium hydroxide to the end of the reaction. After the reaction was over, the beaker was taken out, and filtered with a washed and air-dried 30-mL 1G2 glass filter and a 250-mL suction filter flask, and the filtrate was collected in a glass bottle with a lid. The sample to be tested is dissolving pulp or pulp with negligible lignin content.

[0050] (2) Establish a general model:...

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Abstract

The invention discloses a method for quickly determining the content of alpha-cellulose in dissolving pulp and particularly relates to a method for determining the content of alpha-cellulose in dissolving pulp by virtue of ultraviolet-visible spectrometry. The method comprises the following steps: (1) pre-treating a sample; (2) establishing a standard curve or a mathematical model; (3) detecting the sample by virtue of an ultraviolet / visible spectrophotometer; and (4) calculating to obtain a result. When used for determining the content of alpha-cellulose in dissolving pulp, the method has the beneficial effects that the operation is quick and simple, the detection result can be given within just one hour, and moreover, 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 quickly measuring alpha-cellulose content in dissolving pulp. Background technique [0002] Dissolving pulp is a high-purity bleached chemically refined pulp with high alpha-cellulose, low hemicellulose and lignin. It is the raw material of various chemical products, and various cellulose derivatives can be prepared by chemical or physical methods, such as various cellulose ethers and cellulose esters. When dissolving pulp is used as raw material to prepare cellulose derivative products, its purity (generally referred to as α-cellulose content) has a very important impact on the subsequent production process of cellulose derivatives and product quality. For example, in the production process of viscose fiber, the content of α-cellulose plays a decisive role in the yield of alkali treatment section, the amount of carbon disulfide consumed in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 柴欣生何亮辛丽平李静
Owner SOUTH CHINA UNIV OF TECH
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