Desulfurization method of coke oven gas

A coke oven gas and picric acid technology, which is applied in separation methods, chemical instruments and methods, combustible gas purification, etc., can solve the problem of high risk of picric acid concentration deviating from an appropriate value

Active Publication Date: 2015-12-02
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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  • Desulfurization method of coke oven gas
  • Desulfurization method of coke oven gas
  • Desulfurization method of coke oven gas

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Embodiment

[0158] 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.

[0159] 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

[0161] 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-PakPlusCSP800 (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.

[0162] Table 1

[0163] Amount of solid phase extract (mg / L)

[0164]

[0165]

[0166] 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 absorp...

Embodiment 1

[0195] 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.

[0196] (Extraction rate (%))=(1-((absorbance after extraction) / (absorbance before extraction)))×100

[0197] In addition, in Table 4, the concentration of the picric acid reduction product after conversion of the extraction ratio is also shown. The conc...

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Abstract

The method involves extracting the absorption liquid to a desulfurization system and calculating a picric acid reduction product concentration in the absorption liquid extracted by desulfurization system. The picric acid of the quantity is added based on a rule of a thumb to the desulfurization system, where a correlation is acquired with a quantity of the picric acid added to the desulfurization system. The organic substance is extracted from the extracted absorption liquid, where an elemental analysis is conducted corresponding to an extract.

Description

technical field [0001] The invention relates to a method for desulfurizing coke oven gas. 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 convert hydrogen sulfide into ammonia hydrogen sulfide (NH 4 SH) and is converted to sulfur by oxidation of the ammonium hydrosulfide with picric acid. [0004] In the abov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10K1/08C10K1/12G01N21/31B01D53/14B01D53/86C10K1/14G01N21/33G01N21/35G01N21/3577
Inventor 大木章稻益裕修犬饲正法谷口昌宏
Owner KAGOSHIMA UNIV
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