Method for reducing degradation of complex ferrous iron under aerobic conditions

A ferrous and complexing technology, applied in the field of liquid-phase desulfurization and denitrification, can solve the problems of high operating cost and a large amount of waste liquid, and achieve the effect of saving cost, avoiding degradation and reducing cost.

Active Publication Date: 2020-02-21
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on the problems existing in the prior art, the purpose of the present invention is to provide a method for reducing the degradation of complexed ferrous under aerobic conditions, which can solve the problem of delaying the degradation of complexed iron by free radical scavengers and excessive operating costs. High, the problem of generating a large amount of waste liquid

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  • Method for reducing degradation of complex ferrous iron under aerobic conditions
  • Method for reducing degradation of complex ferrous iron under aerobic conditions
  • Method for reducing degradation of complex ferrous iron under aerobic conditions

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Embodiment 1

[0024] This embodiment provides a method for reducing the degradation of complexed ferrous iron under aerobic conditions, from which, the effect of initial pH on FeSO under aerobic conditions can be determined. 4 The influence of hydroxyl radical output in the aqueous solution, the steps are as follows:

[0025] Weigh 0.02484g of salicylic acid, dissolve it with 2mL of absolute ethanol, dilute to a 100mL volumetric flask, mix well, and prepare a 1.8mmol / L salicylic acid solution. Weigh 0.1251g FeSO 4 ·7H 2 O was fixed to a 250mL volumetric flask and configured as 1.8mmol / L FeSO 4 solution. Take 4mL salicylic acid solution and 4mL FeSO 4 After the solution is mixed, adjust the pH of the solution with sulfuric acid or sodium hydroxide, and add ultrapure water to make it up to 10 mL, then put it into a bubbling tube, and inject oxygen into it for bubbling. Test the absorbance and pH at regular intervals, and determine the amount of hydroxyl radicals by measuring the absorban...

Embodiment 2

[0031] The present embodiment provides a method for reducing the degradation of complexed ferrous iron under aerobic conditions, from which, the impact of initial pH on the production of hydroxyl radicals in Fe(II)-EDTA aqueous solution under oxygen conditions can be determined, the steps are as follows:

[0032] Weigh 0.02484g of salicylic acid, dissolve it with 2mL of absolute ethanol, dilute to a 100mL volumetric flask, mix well, and prepare a 1.8mmol / L salicylic acid solution. Weigh 0.05004g FeSO 4 ·7H 2 O and 0.06696g disodium ethylenediaminetetraacetate were fixed to a 100mL volumetric flask, and configured as a 1.8mmol / L Fe-EDTA solution. After mixing 4mL salicylic acid solution and 4mL Fe-EDTA solution, adjust the pH of the solution with sulfuric acid or sodium hydroxide, add ultrapure water to make it 10mL, then put it into the bubbling tube, and let oxygen flow in for bubbling. Bubble; test absorbance and pH at regular intervals, determine the amount of hydroxyl ra...

Embodiment 3

[0037] This embodiment provides a method for reducing the degradation of complexed ferrous iron under aerobic conditions, from which, it can be determined that the intermediate product H 2 o 2 To the influence of the hydroxyl radical output in the Fe-EDTA aqueous solution under the condition of passing oxygen, the steps are as follows:

[0038] Take 4mL of 1.8mmol / L Fe(II)-EDTA solution with a pH of 4.4, add 4mL of 1.8mmol / L salicylic acid solution, and add ultrapure water to make the volume to 10mL, or take 1.8mmol / L with a pH of Add 4mL of 4.4 Fe-EDTA solution, add 4mL of 1.8mmol / L salicylic acid solution, and add 2mL of 0.1mol / L titanium potassium oxalate solution (3.54g constant volume 100mL), then put the two samples into the bubbler tube respectively, Bubble with oxygen supply gas. Test the absorbance and pH at regular intervals, and determine the amount of hydroxyl radicals by measuring the absorbance of hydroxybenzoic acid at 525nm. The greater the absorbance at 525n...

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Abstract

The invention discloses a method for reducing the degradation of complex ferrous under aerobic conditions. The method comprises any one or two of the following steps: (1) increasing the pH value of anaqueous ferrous solution to enable the pH value of the aqueous ferrous solution to be not less than 5.3, and reducing the generation amount of H2O2 and the generation amount of hydroxyl radicals; and(2) adding H2O2 generated in the complexing degradation process of titanium potassium oxalate into the aqueous ferrous solution. According to the method, by increasing the pH value of the solution, reducing the generation of the H2O2 intermediate product and the like, the yield of hydroxyl radicals is reduced, and the problem of degradation of complexing ferrous iron under aerobic conditions is solved. The method is easy to operate and low in cost, and is a novel method for avoiding degradation of an iron complex in the process of catalytic oxidation of hydrogen sulfide or complexing of nitric oxide.

Description

technical field [0001] The invention relates to the field of liquid-phase desulfurization and denitrification, in particular to a method for reducing the degradation of complexed ferrous iron under aerobic conditions. Background technique [0002] In the liquid phase denitrification process of flue gas, ethylenediaminetetraacetic acid complexed ferrous (Fe(II)EDTA) can complex with NO to form Fe(II)EDTA(NO), thereby completing flue gas denitrification. This technology can not only High-efficiency removal of NO, high-efficiency desulfurization, and avoiding the disadvantages of traditional selective catalytic reduction denitrification, such as high investment and operation costs, catalyst deactivation, and secondary pollution, are a promising technology. However, the main problem faced by this technology is that during the operation process, due to the oxygen contained in the flue gas, the complexes complexed with ferrous iron will gradually degrade and inactivate, and lose t...

Claims

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Application Information

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IPC IPC(8): C02F1/66
CPCC02F1/66
Inventor 王建宏赵子莹
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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