Complex iron desulfurizer for wet oxidation dehydrogen sulfide and preparation method thereof

A hydrogen sulfide removal and wet oxidation technology, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of high regeneration air consumption, large regeneration equipment size, and slow regeneration rate, so as to reduce the consumption, The effect of low cost and improved regeneration rate

Active Publication Date: 2020-07-10
WUHAN GLT ENERGY & ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese invention patent application (public date: January 13, 2016, publication number: CN105233649A) discloses a complex iron desulfurizer, which contains the following components: soluble iron salt, iron salt chelating agent, sulfide absorbent, stabilizer agent, composite sulfur particle sedimentation agent and multifunctional corrosion inhibitor; among them, Fe in soluble iron salt 3+ with Fe 2+ The molar ratio of chelating agent to iron salt is 1:3-5:1, the molar ratio of chelating agent to iron salt is 1.2:1-3:1, the pH value of the solution is 8.0-9.5, the desulfurization process is simple, and the gas-liquid mass transfer efficiency is high, but there are Disadvantages of slow regeneration rate, large size of regeneration equipment, high regeneration air consumption, and high fan power consumption during regeneration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation steps:

[0026] 1) Add ethylenediaminetetraacetic acid (EDTA), NaOH, FeSO 4 ·7H 2 O. CoSO 4 ·7H 2 O was mixed with water, the weight percentage of ferrous ion was 0.5wt%, the molar ratio of Co / Fe was 0.01, the molar ratio of EDTA / (Fe+Co) was 1.2, and the molar ratio of NaOH / Fe was 0.8, and mixed at room temperature React for 3h to make the first-stage mixture;

[0027] 2) Bubble air into the first-stage mixture made in step 1) for 2.5 hours to make the second-stage mixture;

[0028] 3) adding piperazine to the second-stage mixture made in step 2), the weight percentage of piperazine in the first-stage mixture is 1wt%, and the third-stage mixture is made after stirring;

[0029] 4) Add polyethylene glycol with a molecular weight of 400 to the third-stage mixture prepared in step 3), and the weight percentage of polyethylene glycol in the first-stage mixture is 0.1 wt%, and stir and mix for 0.5 hours to obtain the product.

Embodiment 2

[0037] Preparation steps:

[0038] 1) Hydroxyethylethylenediaminetriacetic acid (HEDTA), KOH, FeCl 2 ·7H 2 O, CoCl 2 ·6H 2 O is mixed with water, the weight percentage of ferrous ion is 6wt%, the molar ratio of Co / Fe is 0.1, the molar ratio of HEDTA / (Fe+Co) is 3.0, and the molar ratio of KOH / Fe is 1.2, and the mixed reaction at room temperature 5h, make the first grade mixture;

[0039] 2) Bubble air into the first-stage mixture made in step 1) for 3.5 hours to make the second-stage mixture;

[0040] 3) Add piperazine to the second-stage mixture made in step 2), the weight percentage of piperazine in the first-stage mixture is 5wt%, and stir to make the third-stage mixture;

[0041] 4) Add polyethylene glycol with a molecular weight of 600 to the third-stage mixture prepared in step 3), and the weight percentage of polyethylene glycol in the first-stage mixture is 2 wt%. Stir and mix for 1.5 hours to obtain the product.

Embodiment 3

[0049] Preparation steps:

[0050] 1) Diethylenetriaminepentacarboxylic acid (DTPA), NaOH, C 4 h 6 o 4 Fe, CoCl 2 ·6H 2 O is mixed with water, the weight percentage of ferrous ion is 5wt%, the molar ratio of Co / Fe is 0.02, the molar ratio of DTPA / (Fe+Co) is 2.5, and the molar ratio of NaOH / Fe is 1, and the mixed reaction at room temperature 3h, make the first grade mixture;

[0051] 2) Bubble air into the first-stage mixture made in step 1) for 3 hours to make a second-stage mixture;

[0052] 3) Add piperazine to the second-stage mixture made in step 2), the weight percentage of piperazine in the first-stage mixture is 3wt%, and stir to make the third-stage mixture;

[0053] 4) Add polyethylene glycol with a molecular weight of 2000 to the third-stage mixture prepared in step 3), the polyethylene glycol accounts for 0.8wt% by weight of the first-stage mixture, stir and mix for 1 hour to obtain the product.

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PUM

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Abstract

The invention discloses a complex iron desulfurizing agent for wet-oxidation hydrogen sulfide removal. The complex iron desulfurizing agent contains the following components: water-soluble ferrite, an inorganic base, a water-soluble cobalt salt, an organic complexing agent and water, wherein the weight percent of the iron ion is 0.5-6wt%; a molar ratio of the metal ions in the inorganic base to the iron ion is 0.8-1.2; a molar ratio of the cobalt ion to the iron ion is 0.01-0.1; a molar ratio of the organic complexing agent to the sum of mole numbers of the cobalt ion and the iron ion is 1.2-3.0; the components of the complex iron desulfurizing agent additionally include piperazine and polyethylene glycol; the weight percent of the piperazine and the mixture is 1-5wt%; and the weight percent of the polyethylene glycol and the mixture is 0.1-2wt%. The complex iron desulfurizing agent for wet-oxidation hydrogen sulfide removal, disclosed by the invention, achieves the effects of enhancing the oxygen utilization rate in the regeneration process, reducing the air amount, improving the regeneration rate and reducing the fan energy consumption in the regeneration process and is low in cost.

Description

technical field [0001] The invention relates to the field of gas purification, in particular to a complex iron desulfurizer for wet oxidation dehydrogen sulfide and a preparation method thereof. Background technique [0002] Hydrogen sulfide (H 2 S) is a toxic and harmful gas. It is an industrial waste gas produced with industrial production. It comes from oil refineries, natural gas purification plants, petrochemical plants, gas purification plants, nitrogen fertilizer plants, smelters, paper mills, printing and dyeing plants, Tannery, pharmaceutical factory, pesticide factory and other industries. The presence of hydrogen sulfide in the gas will produce various harmful effects, such as oil and gas pipelines, which are ruptured due to the long-term corrosion of hydrogen sulfide acid; and in the ammonia synthesis industry, the presence of hydrogen sulfide poisons industrial catalysts; in addition, the air contains 0.10% Hydrogen sulfide will cause headaches, dizziness and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/79B01D53/86B01D53/52
CPCB01D53/79B01D53/8612B01D2251/10
Inventor 余国贤潘威
Owner WUHAN GLT ENERGY & ENVIRONMENTAL TECH CO LTD
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