Method for determining dissolved quantity of lignin

A method of determination, technology of dissolved amount, applied in the direction of color/spectral characteristic measurement, etc.

Inactive Publication Date: 2014-10-08
ZHEJIANG TIANNENG BATTERY JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since lignin cannot be completely dissolved in acid, it is impossible to use acid as a solvent to make a standard curve of lignin in acid; another method is to use the difference method, which is to subtract the part of the mass of undissolved acid from the total amount of lignin To obtain the quality of dissolved lignin, because the surface of soluble acid lignin has a large amount of adhesive acid, it is not easy to clean, and carbonization will inevitably occur during the drying process
Large errors in measurement results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 2) Suction filter the solution left standing in step 1), collect the filtrate and filter residue, use a spectrophotometer to measure the absorbance of the filtrate at 280nm and record it as A 1 , A 1 = 0.265;

[0024] 3) Rinse the filter residue obtained in step 2) with pure water at least 3 times, put the washed filter residue together with a funnel with a mass of 57.493g in an oven at 100°C for more than 8 hours, weigh the total mass of the filter residue and funnel and record is 57.844g;

[0025] 4) Calculate the mass M of the acid-insoluble lignin A 1 = 0.351 g, the quality M of lignin A dissolved in sulfuric acid can be obtained 2 =0.049 g, then the acid-soluble lignin A concentration C 1 = 0.245g / L;

[0026] 5) Weigh 0.4 g of lignin B and dissolve it in 200ml of sulfuric acid, repeat steps 1 and 2 and record the absorbance value of the solution as A 2 , A 2 = 1.128, then the concentration C of lignin B dissolved in acid 2 = 0.787g / L, lignin B dissolves 0.1...

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Abstract

The invention discloses a method for determining the dissolved quantity of lignin. The method comprises the following steps: 1) weighing lignin A with the mass of M, dissolving the lignin into 1.28g / ml-1.34g / ml sulfuric acid with the volume of V, stirring for 2h, and standing for 24h; 2) conducting suction-filtration on the solution in the step 1, collecting filtrate and filter residues, and determining the absorbance of the filtrate as A1 by utilizing a spectrophotometer; 3) washing the filter residues in the step 2 for at least three times with pure water, placing the cleaned filter residues together with a hopper with mass of m1 into a 100DEG C drying oven and drying for more than 8h, and weighing the total mass of the filter residues and the hopper as m2; 4) calculating the mass M1(equal to m2 minus m1) of lignin A insoluble to acid, so that the mass M2 of the lignin A soluble to sulfuric acid is equal to M minus M1, and the concentration C1 of lignin A soluble to acid is equal to M2 / V; and 5) weighing the lignin B with the mass of M and dissolving into sulfuric acid with the volume of V, repeating operations of the steps 1 and 2, and recording the absorbance of the solution as A2, so that the concentration C2 of lignin B soluble to acid is equal to (A2 / A1)*C1, and the dissolved quantity M3 of the lignin B in the sulfuric acid with the volume of V is equal to C2*V.

Description

technical field [0001] The invention relates to the field of storage batteries, in particular to a method for measuring the amount of lignin dissolved in a storage battery additive. Background technique [0002] Lead-acid batteries are prone to problems such as surface shrinkage of the negative plate during charging and discharging, especially in low temperature environments. In the prior art, a small amount of expansion agent is added to the negative electrode components to solve the problem of surface shrinkage of the negative electrode plate. Among many expansion agents, lignin is favored because of its small amount and obvious effect. Lignin can be adsorbed on the lead electrode, which has a certain influence on the crystal morphology and specific surface area of ​​the electrode. Due to the difference in the production raw materials, processing technology and post-processing methods of lignin, the lignin provided by different manufacturers has great differences in physi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 周燕陈飞方明学刘松
Owner ZHEJIANG TIANNENG BATTERY JIANGSU
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