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Detection method for lignin content of papermaking pre-cooking liquor

A detection method and technology of lignin, applied in the measurement of color/spectral characteristics, etc., can solve the problem of inability to achieve accurate detection, and achieve the effects of short detection time, high accuracy and good repeatability

Active Publication Date: 2018-11-23
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common ultraviolet spectrophotometric method for detecting lignin content is accurate, fast, and highly repeatable, but accurate detection cannot be achieved due to the absence of standard substances

Method used

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  • Detection method for lignin content of papermaking pre-cooking liquor
  • Detection method for lignin content of papermaking pre-cooking liquor
  • Detection method for lignin content of papermaking pre-cooking liquor

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Comparison scheme
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Embodiment

[0029] 1. Preparation of lignin samples. 5g of the lignin sample of the papermaking precooking liquid and about 2g of the lignin sample to be tested were dried at 105°C to constant weight, ground into a fine powder with a mortar, and passed through a 100-mesh sieve.

[0030] 2. Drawing of standard curve. Prepare acidified acetyl bromide solution, acetyl bromide: glacial acetic acid = 1:3 (V:V). Take 0.025 g of dry lignin powder from the papermaking precooking liquid, add 10 ml of acidified acetyl bromide solution, and prepare a 2.5 mg / ml storage solution.

[0031] Use a pressure-resistant bottle with a polytetrafluoroethylene cover as a digestion and hydrolysis bottle, take 0.1, 0.2, 0.3, 0.4, 0.5, 0.6ml of storage solution in the pressure-resistant bottle, add 4.9, 4.8, 4.7, 4.6, 4.5 , 4.4ml acidified acetyl bromide solution, so that each bottle contains 5ml acidified acetyl bromide, and the lignin content is different. Incubate in a 70°C water bath for 1 hour and 45 minut...

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Abstract

The invention discloses a detection method for a lignin content of papermaking pre-cooking liquor. The detection method comprises the following steps: drying lignin of papermaking pre-cooking liquor and grinding the lignin into fine powder to obtain a lignin standard sample; taking the defined amount of lignin standard sample, preparing a gradient-concentration solution, utilizing an acidizing acetyl bromide method to acetylize lignin, utilizing an ultraviolet spectrophotometer to measure absorbance at the 280nm position and making a standard curve between the absorbance and the lignin concentration; taking the defined amount of the lignin standard sample, utilizing a KLASON method and an acid-soluble lignin detection method to detect contents of KLASON lignin and acid-soluble lignin and correcting the standard curve; taking a lignin sample to be detected, drying, grinding into powder, acetylizing lignin, utilizing the ultraviolet spectrophotometer to measure absorbance at the 280nm position and calculating out the lignin content according to the corrected standard curve. The detection method disclosed by the invention can be utilized for detecting the lignin content of the papermaking pre-cooking liquor and has the advantages of higher accurate rate, good repeatability, short detection time, high efficiency, wide application range and suitability for high-content and low-content lignin detection.

Description

technical field [0001] The invention relates to the field of pulping, papermaking and biomass materials, in particular to a method for detecting the lignin content of papermaking precooking liquor. Background technique [0002] Lignin is a kind of substance composed of polymerized aromatic alcohols, which exists in woody tissue, and its main function is to harden the cell wall by forming an interwoven network, which is the main component of the secondary wall. Lignin is mainly located between cellulose fibers and acts as an anti-compression. In woody plants, lignin accounts for 25% and is the second most abundant organic matter in the world (cellulose is the first). Lignin is non-toxic, has excellent versatility in performance, and is widely used in industry. Moreover, lignin can be a good substitute for some non-degradable chemicals, which is very important for our environmental protection. [0003] The composition of lignin is complex, the molecular weight distribution ...

Claims

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Application Information

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IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 施晓旦李赛邵威
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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