Preparation method of complex iron catalyst for wet desulphurization

Abstract

The invention discloses a preparation method of a complex iron catalyst for wet desulphurization, and belongs to the technical field of environmental protection. The preparation method comprises the following steps: (1) preparing sulfophthalic acid; (2) reacting sulfophthalic acid with sodium hydroxide to prepare a compound I; (3) reacting the compound I with cobalt chloride to prepare a compoundII; (4) reacting the compound I with an iron-containing compound to prepare a compound III; (5) reacting the compound II with a compound III to obtain a compound IV; (6) preparing a stabilizer; and (7) uniformly mixing the compound IV with double stabilizers, heating, cooling, and drying to obtain the catalyst. According to the prepared composite iron catalyst for sulfur-containing gas desulfurization, the working sulfur capacity is greatly improved, the concentration of iron ions is reduced while hydrogen sulfide absorption is completed, the ideal absorption effect is achieved, the side reaction occurrence probability is reduced, the very good hydrogen sulfide absorption effect can be achieved, and meanwhile generation of secondary salt can be inhibited.

Description

technical field [0001] The invention relates to a desulfurization catalyst, in particular to a complex iron catalyst, and belongs to the technical field of environmental protection. Background technique [0002] Chemical raw materials such as coal and natural gas, and other exhaust gases contain a certain amount of sulfides. If these sulfides are not removed, they will cause serious air pollution. In use, hydrogen sulfide can cause corrosion of equipment and pipelines and catalyst poisoning, resulting in increased production costs and affecting product quality. Therefore, the gas must be desulfurized before being used as fuel gas and syngas. There are many gas desulfurization methods, which can be divided into two categories: dry desulfurization and wet desulfurization according to the state of the desulfurizer. The dry desulfurization process uses solid adsorbents to remove hydrogen sulfide and organic sulfur in the gas. The desulfurization has a high degree of purificati...

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Problems solved by technology

[0003] Chinese patent 201610777813.0 discloses a complex iron desulfurization liquid for wet desulfurization and its preparation method, including antioxidant, non-ionic surfactant, defoamer, complex iron catalyst and water. The preparation method is complicated and stable poor sex

[0004] Chinese patent CN1398659A discloses a biochemical iron-alkali solution catalytic gas desulfurization method, using iron-alkali solution to remove organic sulfur and / or inorganic sulfur in cold air, and the iron-alkali solution is composed of aerobic spores and / or aerobic bacteria , iron compounds, alkaline substances, phenolic substances and water, it is a biochemical wet desulfurization technology, but the cost of this catalyst is high, the stability is poor, and the initial investment in practical application is large

[0005] The document "ISS complex iron-polyphenol catalyst desulfurization technology" discloses a complex iron-polyphenol desulfurization catalyst, the main active components are complex iron compounds and polyphenols, and the complexes of variable-valence metal iron are used as Desulfurization catalysts, polyphenols are used as regeneration catalysts. During the desulfurization process, organic sulfur is first absorbed and transformed, and then oxidized to elemental sulfur by the catalyst to be removed. However, there are still a large number of side reactions in the process of desulfurization and regeneration.

[0006] Traditional iron-based catalysts have the disadvantages of strong corrosion, high desulfurization cost, and low sulfur capacity, and the iron ion degrades quickly, has poor stability and precipitates, and long-term use will easily cause the suspended solids in the desulfurization system to increase and block the packing, and the corrosion of equipment and pipelines will intensify. Bring hidden dangers to the continuity and operability of production

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