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Picric acid reduction product concentration measuring method and desulphurization method adopting the measuring method

A technology of coke oven gas and determination method, which is applied in measuring devices, combustible gas purification, combustible gas purification/transformation, etc., and can solve the problem of high risk of picric acid concentration deviating from an appropriate value

Active Publication Date: 2013-03-13
KAGOSHIMA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for example, when separating and recovering the precipitated sulfur in the regeneration tower, etc., the absorption liquid will be discharged out of the desulfurization system. Therefore, in the above-mentioned method of adding picric acid, the concentration of picric acid in the absorption liquid deviates from the appropriate value. higher risk

Method used

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  • Picric acid reduction product concentration measuring method and desulphurization method adopting the measuring method
  • Picric acid reduction product concentration measuring method and desulphurization method adopting the measuring method
  • Picric acid reduction product concentration measuring method and desulphurization method adopting the measuring method

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Embodiment

[0143] Hereinafter, the present invention will be described in detail using examples, but the present invention is not limited to the following examples within the range not exceeding the gist of the present invention.

[0144] First, the method for measuring the concentration of the picric acid reduction product before conversion into the extraction rate will be described using Reference Example 1 below.

reference example 1

[0146] exist figure 1 In the regeneration tower 14 shown, the regenerated absorption liquid (desulfurization liquid) is sampled from the sampling pipe S3 provided on the piping 16 conveyed to the desulfurization tower 12. figure 2 The extraction procedure shown yields Extract A. As the solid-phase extraction column, a product name "Sep-Pak Plus CSP 800 (filler: polystyrene resin, particle diameter: 75 to 150 μm)" manufactured by Nippon Wood Co., Ltd. was used. Weigh the extract A to find the concentration of the extract A in the desulfurization liquid. The results are shown in the "F-1 (Inlet)" column of Table 1.

[0147] Table 1

[0148] Amount of solid phase extract (mg / L)

[0149]

[0150]

[0151] Using a Fourier transform infrared spectrophotometer (manufactured by JASCO Corporation, product name "FT / IR410"), based on image 3 The quantification process of aliphatic hydrocarbons is shown, obtained by infrared absorption spectra. The measurement of infrared abs...

Embodiment 1

[0180]The absorption liquid was sampled from the sampling tube S3 at different dates, and the concentration of the picric acid reduction product before conversion of the extraction rate was measured by the same method as in Reference Example 1. The results are shown in Table 4. Table 4 also shows the measurement results of the absorbance at 475 nm of the sample before organic substance extraction and the absorbance at 475 nm of the sample after organic substance extraction. For the measurement, U-2900 (ultraviolet-visible spectrophotometer) manufactured by Hitachi High Technologies, Inc. was used. In addition, the extraction rate (%) is also shown in Table 4. The extraction rate (%) was obtained by the following formula.

[0181] (Extraction rate (%))=(1-((absorbance after extraction) / (absorbance before extraction)))×100

[0182] In addition, in Table 4, the concentration of the picric acid reduction product after conversion of the extraction ratio is also shown. The conce...

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Abstract

The method involves conducting an UV-ray absorption spectrometry with respect to absorption liquid. The UV-ray absorption spectrometry is conducted with respect to absorption liquid after extracting organic substance from absorption liquid. The extractability of picric acid reduction product is acquired in organic substance based on UV-ray absorption spectrometry results. The picric acid reduction product concentration is obtained based on result of elemental analysis and infrared spectroscopic analysis conducted with respect to extract.

Description

technical field [0001] The present invention relates to a method for measuring the concentration of a picric acid reduction product in an absorbing liquid used for desulfurization of coke oven gas, and a method for desulfurizing coke oven gas using the method. Background technique [0002] Conventionally, in the process of carbonizing coal to produce coke, coke oven gas is generated. Since such coke oven gas contains hydrogen sulfide derived from sulfur contained in coal, if it is used as a fuel as it is, sulfur oxides (SOx) derived from hydrogen sulfide will be produced, which affects the environment. Therefore, if you want to use coke oven gas as fuel, you must remove hydrogen sulfide before combustion. [0003] As the above-mentioned desulfurization method, a widely used method is to use NH as an absorbent 4 The alkaline aqueous solution of OH and picric acid as a desulfurization catalyst (hereinafter also referred to as "absorbing liquid") contacts coke oven gas to con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/35C10K1/12C10K1/14G01N21/3504
Inventor 大木章稻益裕修犬饲正法谷口昌宏
Owner KAGOSHIMA UNIV
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