Complex iron desulfurization catalyst and preparation method thereof

A desulfurization catalyst and complex iron technology, applied in the field of gas purification, can solve the problems of high difficulty in desulfurization wastewater treatment, corrosion of desulfurization equipment, high loss rate of Fe ions, etc., to avoid corrosion of desulfurization equipment, low loss rate, and good stability Effect

Active Publication Date: 2021-02-05
NINGBO JINYUANDONG PETROCHEM ENG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a complexed iron desulfurization catalyst and its preparation method, which overcomes the corrosion of desulfurization equipment caused by the complex iron desulfurization liquid containing a large amount of harmful impurity anions in the prior art, the high difficulty of desulfurization wastewater treatment and the low desulfurization efficiency. Problems such as high loss rate of Fe ions in desulfurization catalyst

Method used

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  • Complex iron desulfurization catalyst and preparation method thereof

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Effect test

Embodiment 1

[0035]Synthesis of iron-based double metal hydroxide: Dissolve ferric nitrate, urea and copper sulfate in water to obtain solution I, and stir and heat the solution I at 60° C. for 2.5 hours to obtain iron-based double metal hydroxide. The molar ratio of urea to ferric nitrate is 20:1, and the molar ratio of Fe to Cu is 100:1.

[0036]Synthesis of desulfurization catalyst: 2.5 parts by weight of N-(2-hydroxyethyl)ethylenediamine-N,N',N'triacetic acid, 0.01 parts by weight of polyethylene glycol ether and 0.01 parts by weight of sodium dodecyl sulfonate 1 part was dissolved in water to obtain solution II; while stirring, 1.5 parts by weight of freshly prepared iron-based double metal hydroxide was slowly added to the solution II in 4 times to obtain solution III;2CO3Adjust the pH of solution III to 8.

Embodiment 2

[0038]Synthesis of iron-based double metal hydroxide: Dissolve ferric chloride, urea and nickel sulfate in water to obtain solution I, and stir and heat the solution I at 70° C. for 3.5 hours to obtain iron-based double metal hydroxide. The molar ratio of urea to ferric nitrate is 15:1, and the molar ratio of Fe to Ni is 70:1.

[0039]Synthesis of desulfurization catalyst: 3 parts by weight of 1,3-propanediamine-N,N,N',N'-tetraacetic acid, 0.01 parts by weight of polyethylene glycol ether and 0.01 parts by weight of sodium p-toluenesulfonate are dissolved in water Obtain solution II; while stirring, add 2 parts by weight of freshly prepared iron-based double metal hydroxide slowly and 4 times into the solution II to obtain solution III; use KHCO3Adjust the pH of solution III to 8.

Embodiment 3

[0041]The amount of 1,3-propanediamine-N,N,N',N'-tetraacetic acid is 2.5 parts by weight, the amount of freshly prepared iron-based double metal hydroxide is 1.5 parts by weight, and the remaining steps are the same as in Example 2.

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Abstract

The invention relates to a complex iron desulfurization catalyst and a preparation method thereof, and belongs to the field of gas purification. The desulfurization catalyst comprises the raw materials in parts by weight: 2.5-9 parts of a complexing agent, 1.5-6 parts of an iron source, 0.01-1.5 parts of a modifier, 0.01-1.5 parts of a stabilizer and a pH regulator, wherein the iron source is selected from an iron-based bimetallic compound doped with a dissimilar metal element M, and M represents one or more of dissimilar metal elements Cu, Co and Ni. Harmful anion impurities do not need to beintroduced in the preparation process of the complex iron desulfurization catalyst, the problems of desulfurization equipment corrosion, high desulfurization wastewater treatment difficulty and the like are avoided, and the catalytic activity and desulfurization efficiency are improved through the synergistic effect between Fe and dissimilar metal M in the desulfurization catalyst; in the use process of the desulfurization catalyst, the removal efficiency of H2S can be kept at 99.5% or above, the loss rate of Fe in the desulfurization catalyst in the desulfurization process is low, and the stability of Fe is good.

Description

Technical field[0001]The invention relates to the field of gas purification, in particular to a complex iron desulfurization catalyst and a preparation method thereof.Background technique[0002]The rapid development of my country's coal gasification, natural gas purification, and oil extraction and processing industries also produces a large amount of hydrogen sulfide (H2S) Gas, H2S is foul-smelling and toxic. It can be dissolved in water to corrode production equipment and is one of the main causes of acid rain. Inhalation of high concentration H in a short time2S gas is life-threatening, low concentration of H2S can irritate the eyes, respiratory system and central nervous system.[0003]Complex iron desulfurization technology is a wet redox desulfurization technology using iron complex as a catalyst.2The acidity and high solubility of S gas, use lye to quickly absorb H2S gas generates HS-; reusing its strong reducibility, the HS- in the liquid phase is oxidized to elemental sulfur b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J31/06B01J23/745B01J23/75B01J23/755B01D53/52B01D53/86
CPCB01J31/2217B01J31/068B01J23/745B01J23/75B01J23/755B01D53/8612B01J2531/842B01J2531/0213
Inventor 赵传军项裕桥
Owner NINGBO JINYUANDONG PETROCHEM ENG TECH
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