A kind of compound chelated iron desulfurizer and preparation method thereof

Abstract

The invention relates to a desulfurizer for gas-phase desulfurization, and discloses a composite chelated iron desulfurizer and a preparation method thereof. The high-valent soluble iron salt is added into deionized water to keep stirring, and the A-type chelating agent and the B-type chelating agent are added in sequence, and the stirring is maintained. Gradually add a pH buffer until the solid matter is completely dissolved, continue to add a pH buffer to adjust the pH to 8.0-13.5, and continue to stir the reaction for 4-8h to obtain a composite chelated iron desulfurizer. The A-type chelating agent is HEDTA, EGTA, DGA, 2 One or more of oxyacetoxymalonic acid, 2-oxyacetoxybutyric acid and its sodium salt, potassium salt, the B-type chelating agent is sodium citrate, sulfosalicylic acid, sulfosalicylic acid One or more of sodium, sodium gluconate, mannitol, and oligosaccharides, the molar ratio of the A-type chelating agent and the B-type chelating agent is 1:1-1:0.25; the chelating agent and the high-valent water-soluble iron salt The molar ratio of Fe is 1:1-3:1; the mass fraction of Fe in the desulfurizer is 1.0-6.0wt%, and the composite chelated iron desulfurizer of the present application has a high saturated sulfur capacity, good stability and a wide range of pH use.

Description

technical field [0001] The invention relates to a desulfurizer for gas-phase desulfurization, in particular to a compound chelated iron desulfurizer and a preparation method thereof. Background technique [0002] At present, in the process of mineral energy mining and chemical production and refining, human beings often obtain or produce a 2 S gas such as natural gas, oilfield associated gas, refinery gas, coal-to-gas, petrochemical tank farm tail gas. To avoid H 2 S corrodes pipelines in the transportation of such gas and exhaust gas, and affects the normal use of other materials during processing and application. 2 S is removed. [0003] At present, the treatment process of sulfur-containing gas includes the LO-CAT process developed by Wheelabrator Clean Air Systems, USA, which uses desulfurization liquid to absorb H in an alkaline solution environment. 2 S, the desulfurization liquid contains chelated iron desulfurizer, and the chelate of Fe ions in it and H 2 S reac...

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Problems solved by technology

[0016] The use range of the complex iron desulfurizer is 8-9, and the use range of the pH value is relatively narrow. When the complex iron desulfurizer is used for desulfurization, the above-mentioned desulfurizer is mixed with the gas containing sulfide by using a supergravity device. The countercurrent contact in the overweight machine makes the sulfide in the gas phase be absorbed by the alkaline desulfurizer, so as to improve the absorption rate of sulfide and the efficiency of sulfur recovery. However, the saturated sulfur capacity of the complex iron desulfurizer is low and the pH The range of values ​​used is narrow, resulting in the fact that it is actually used to remove H 2 When S, the cycle is fast, and a large amount of desulfurization agent is required to be recycled, resulting in high desulfurization cost

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