A complex iron desulfurizer

Abstract

The invention discloses a complex iron desulfurizer, which uses soluble iron salt as iron source, the mixture of tetrasodium iminodisuccinate and sodium citrate as complexing agent, and soluble divalent copper salt as cocatalyst. A corrosion inhibitor and polyethylene glycol ether are added, and a pH regulator is used to adjust the pH of the desulfurizer of the present invention to 8-9.5. The complex iron desulfurizer provided by the present invention is desulfurized under the promotion of divalent copper ions. Its regeneration speed is fast and the regeneration speed is good, which leads to the increase of the concentration of ferric ion in the desulfurization liquid and accelerates the reaction speed. , reducing the production cost; at the same time, due to the reduction of the amount of secondary salt, the salt content in the sulfur foam is relatively reduced, which increases the purity of the final sulfur output, increases the value of by-products, and further reduces production costs.

Description

technical field [0001] The invention relates to the technical field of desulfurization, in particular to a complex iron desulfurizer. Background technique [0002] Hydrogen sulfide, molecular formula H 2 S, with a molecular weight of 34.076, is a flammable acid gas under standard conditions, colorless, smells of rotten eggs at low concentrations, and smells of sulfur at extremely low concentrations, and is highly toxic (LC50=444ppm<500ppm). Its aqueous solution is hydrosulfuric acid. Soluble in water, easily soluble in alcohols, petroleum solvents and crude oil. The ignition point is 292°C. Hydrogen sulfide is a flammable and hazardous chemical, which can form an explosive mixture when mixed with air, and can cause combustion and explosion when exposed to open flames and high heat. [0003] The chemical raw material gas produced with coal, coke, natural gas and petroleum as raw materials contains different concentrations of H2S gas. The existence of high-concentration...

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Problems solved by technology

[0007] However, the problems in the above patents are that due to the slow regeneration rate of desulfurization rich liquid, the content of ferric iron in the entire desulfurization system decreases, which in turn leads to a slow reaction rate during desulfurization, a high amount of secondary salts, and the formation of malignant Circulation; if you want to increase the content of ferric iron in the system, you need to add a large amount of desulfurizer, resulting in an increase in cost

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