Composite chelated iron desulfurizing agent and preparation method thereof

Abstract

The invention relates to desulfurizing agents for gaseous phase esulfurization, and discloses a composite chelated iron desulfurizing agent and a preparation method thereof. High valent soluble ferricsalt is added into deionized water to be kept stirred, atype A chelating agent and a type B chelating agent are sequentially added and to be kept stirred, a pH buffer agent is gradually added till the solid matters are completely dissolved, the pH buffer agent is added continuously till the pH value is adjusted to 8.0-13.5, and the mixed matters are continuously stirred and react for 4-8 hours, so that the composite chelated iron desulfurizing agent is obtained; the type A chelating agent is one or more of HEDTA, EGTA, DGA, 2-peracetic acid malonic acid, 2-peracetic acid isobutyric acid and sodium salt and potassium salt thereof, the type B chelating agent is one or more of sodium citrate, sulfosalicylic acid, sodium sulfosalicylate dihydrate, sodium gluconate, mannitol and oligose, the mole ratio of the type A chelating agent to the type B chelating agent is from (1:1)to (1:0.25), the mole ratio of the chelating agents to high valent water-soluble ferric salt is from (1:1)to (3:1), and the mass percentage of Fe in the desulfurizing agent is 1.0-6.0wt%. The composite chelated iron desulfurizing agent is high in saturated sulfur capacity and stability, and wide in pH application range.

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 H 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 this type of gas and exhaust gas transportation, and affects the normal use of other materials during processing and application. It is necessary to control the H in gas and exhaust gas 2 S to remove. [0003] At present, the LO-CAT process developed by the American Wheelabrator Clean Air Systems Company is used to treat sulfur-containing gases, which uses desulfurization liquid to absorb H 2 S, the desulfurization solution contains a chelated iron desulfurizer, and the Fe ion chelate a...

AI Technical Summary

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

Images