Method for determining sulfate radicals in organic amine absorption liquid in process of renewable wet flue gas desulphurization

A technology of wet flue gas desulfurization and measurement method, which is applied in the direction of analyzing materials through chemical reactions and material analysis through observing the influence of chemical indicators, which can solve the problems of cumbersome operations, large influence of alkali metals, and long time consumption. and other problems, to achieve the effect of simple detection method and accurate and reliable measurement results

Inactive Publication Date: 2015-06-03
袁根福
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Problems solved by technology

The classic gravimetric method has high accuracy and is mature, but it takes a long time and is cumbersome to operate; the photometric method and colorimetric method are only suitable for relatively clean samples; the ethylenediaminetetraacetic acid (EDTA) volumetric method needs to add excess barium salt, and Back titration with EDTA, greatly affected by alkali metals

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  • Method for determining sulfate radicals in organic amine absorption liquid in process of renewable wet flue gas desulphurization
  • Method for determining sulfate radicals in organic amine absorption liquid in process of renewable wet flue gas desulphurization

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specific Embodiment

[0009] Specific embodiment: the method of the present invention is indicator with alizarin red, with BaCl 2 Determination of p(SO in desulfurization absorbent by direct titration 2- 4 ).

[0010] The specific steps are as follows: Dilute the organic amine absorption solution according to a certain ratio, take 20 mL of the diluted sample in a conical flask, add 5 drops of alizarin red indicator with a mass concentration of 4 g / L, and use 1:1 (volume ratio) Acetic acid solution to adjust the pH to 4.0-4.5, add 10mL of ethanol and a small amount of barium sulfate solid, with the concentration of 0.025mol / L BaCl 2 The solution is titrated until the color of the sample changes from yellow to pink, which is the end point, and the consumption of BaCl is recorded. 2 solution volume. According to p(SO 2- 4 )=C 2 ×V 2 ×K×96×1000 / V 1 Calculate the sulfate concentration, in the formula: C 2 for BaCl 2 Solution concentration, mol / L; V 2 For the consumption of BaCl 2 Solution v...

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Abstract

The invention discloses a method for determining sulfate radicals in organic amine absorption liquid in the process of renewable wet flue gas desulphurization, which belongs to the field of flue gas desulfurization. For solving the problem that existing detection methods are long in time consuming, cumbersome in operation, high in sample requirements, and largely affected by alkali metal, the invention provides a method for determining sulfate radicals in organic amine absorption liquid, which is simple and rapid in process, and accurate and reliable in measurement results. The method is implemented by taking alizarin red as an indicator through determining p(SO2-4) in a desulfurization absorbent by using BaCl2 in a direct titration mode. According to the method, the process is simple and rapid and the measurement results are accurate and reliable.

Description

technical field [0001] The invention belongs to the field of flue gas desulfurization. Background technique [0002] The renewable wet flue gas desulfurization process uses organic amine solution to absorb SO2 in the flue gas of the catalytic cracking unit, so that the SO2 content in the purified flue gas meets the emission requirements, absorbing SO 2 The organic amine solution is regenerated and recycled. The desulfurization absorbent organic amine solution in this process absorbs SO 2 SO 2- 3 , during the desorption process, due to the oxidation part of SO 2- 3 Inevitably converted to SO 2- 4 , and remain in the absorption solution. In addition, the actual industrial flue gas usually contains about 10% SO by volume. 3 , is not completely removed in the water washing section and will also be absorbed by the absorption liquid in the absorption tower to form a sulfate (heat stable salt) solution. Fast, accurate and easy detection of p(SO 2- 4 ), which can provide...

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Application Information

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IPC IPC(8): G01N21/79
Inventor 袁根福
Owner 袁根福
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