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Papermaking black liquid lignin content detection method

A paper-making black liquor and detection method technology, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems 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

AI Technical Summary

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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  • Papermaking black liquid lignin content detection method
  • Papermaking black liquid lignin content detection method
  • Papermaking black liquid lignin content detection method

Examples

Experimental program
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Embodiment

[0032] 1. Preparation of lignin samples. 5g of papermaking black liquor lignin sample and about 2g of lignin sample to be tested were dried at 105°C to constant weight, ground into fine powder with a mortar, and passed through a 100-mesh sieve.

[0033] 2. Calculation of solution absorbance Absorptivity. Prepare acidified acetyl bromide solution, acetyl bromide: glacial acetic acid = 1:3 (V:V). Use a pressure-resistant bottle with a polytetrafluoroethylene cover as a digestion and hydrolysis bottle to take 0.0005-0.0030 g of dry lignin powder from papermaking black liquor, and add 5 ml of acidified acetyl bromide solution. Tighten the PTFE stopper, keep warm in a 70°C water bath for 1 hour and 45 minutes, and rotate gently every 30 minutes.

[0034] Cool in an ice-water bath, transfer to a 100ml volumetric flask, add 10ml of glacial acetic acid, 4.5ml of 4N sodium hydroxide and 1.5ml of 5N hydroxylamine hydrochloride, mix well after each addition, and finally dilute to 100ml...

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Abstract

The invention discloses a papermaking black liquid lignin content detection method which comprises the following steps: drying papermaking black liquid lignin and grinding into fine powder to obtain alignin standard sample; taking the defined amount of the lignin standard sample, utilizing an acidized acetyl bromide method to acetylize lignin, diluting with water to a specific volume, utilizing an ultraviolet spectrophotometer to measure absorbance at the 280nm position, calculating out solution absorbance according to a formula, performing a plurality of groups of parallel experiments and taking an average value; taking the defined amount of the lignin standard sample, utilizing a KLASON method and an acid-soluble lignin detection method to detect the total content X of KLASON lignin andacid-soluble lignin and calculating out corrected absorbance; taking a lignin sample to be measured, drying, grinding into fine powder, utilizing an acidized acetyl bromide method to acetylize lignin, diluting with water to a specific volume, utilizing the ultraviolet spectrophotometer for measuring absorbance at the 280nm position and calculating out the lignin content according to the formula.When the detection method disclosed by the invention is utilized for detecting the papermaking black liquid lignin content, the detection method has the advantages of higher accuracy, good repeatability, short detection time, high efficiency and wide application range; furthermore, the detection method is suitable for detecting high-content lignin and low-content lignin.

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 black 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 is wi...

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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