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Method for measuring tannin extract content in tannin extract doctor solution

A technology of desulfurization liquid and tannin extract, which can be used in the preparation of test samples and the measurement of color/spectral characteristics, etc., and can solve problems such as low absorbance error and so on.

Inactive Publication Date: 2005-04-27
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0002] Extraction desulfurization is an effective method in the wet desulfurization method of gas purification. This method uses the compounding of tannins in the extract and lye to remove H in coke oven gas. 2 S, the traditional colorimetric method in the industry to measure the content of tannin extract in desulfurization solution is to use visible light spectrophotometry to measure the absorbance of standard solutions with different concentrations at 420nm, and draw a standard curve to measure the absorbance of desulfurization solution with unknown concentrations, which can be checked from the standard curve Extracted tannin content, because its absorbance is too low, there is a large error

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  • Method for measuring tannin extract content in tannin extract doctor solution
  • Method for measuring tannin extract content in tannin extract doctor solution
  • Method for measuring tannin extract content in tannin extract doctor solution

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Embodiment approach 1

[0020] 1) Preparation of extract standard solution

[0021] Accurately weigh 0.5g of tannin extract dried at 90°C and dissolve in 400mL of distilled water, add 2.5g of Na 2 CO 3 , plus 15gNaHCO 3 , 0.5gNaVO 3 After the above salts are completely dissolved, cool to room temperature, carefully transfer to a 1000mL volumetric flask, dilute to the mark with distilled water, and the solution contains 0.5mg of tannin extract per mL.

[0022] 2) Determination of the absorption wavelength of the extract solution

[0023] Take 10ml of the above standard solution and dilute it to 100ml with distilled water, at this time the extract content is 0.05mg.mL -1 , using distilled water as a blank sample, and using a LAMBDA BIO 40 UV / visible spectrophotometer to scan the wavelength at 250nm, the obtained spectrum is as follows figure 1 shown.

[0024] It can be seen from the figure that the maximum absorption wavelength of tannin extract is at 320nm, so 320nm is selected as its measuremen...

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Abstract

The present invention belongs to chemical technology, and is ultraviolet spectrophotometric method of measuring the content of tanning extract in tanning extract desulfurizing liquid. The method has the materials including industrial tanning extract, sodium carbonate, sodium bicarbonate and sodium metasilicate; and adopts ultraviolet / visible light spectrophotometer. The measuring process includes regulating the measurement wavelength to 320 nm, regulating pH value and other technological parameters, diluting the solution of tanning extract properly, drawing standard curve and forming regression formula, measuring the absorbance of the measured liquid and finding out the content of tanning extract based on the standard curve. The method is accurate.

Description

technical field [0001] The invention discloses a method for measuring tannin extract content in tannin extract desulfurization solution, which belongs to the field of chemical industry, and specifically relates to a method for measuring tannin extract content in tannin extract desulfurization solution by gas purification. technical background: [0002] Extraction desulfurization is an effective method in the wet desulfurization method of gas purification. This method uses the compounding of tannins in the extract and lye to remove H in coke oven gas. 2 S, the traditional colorimetric method in the industry to measure the content of tannin extract in desulfurization solution is to use visible light spectrophotometry to measure the absorbance of standard solutions with different concentrations at 420nm, and draw a standard curve to measure the absorbance of desulfurization solution with unknown concentrations, which can be checked from the standard curve Extracted tannin conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N21/33
Inventor 凌开成申峻黄澎赵贵哲刘开明
Owner TAIYUAN UNIV OF TECH
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