Selective desulfurization absorbent, system and process for blast furnace gas with high carbon-sulfur ratio

By using compound absorbents, the problems of high CO2 co-absorption rate and poor desulfurization effect in blast furnace gas with high carbon-to-sulfur ratio are solved, achieving efficient selective desulfurization and low-energy decarbonization, meeting the green and low-carbon development needs of the steel industry.

CN121780210APending Publication Date: 2026-04-03CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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Patent Information

Application Number
CN202610104532.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-26
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

High carbon-to-sulfur ratio blast furnace gas has a high CO2 co-absorption rate and poor desulfurization effect. Existing organic amine desulfurization technology is difficult to meet the requirements for ultra-low total sulfur emissions and has high energy consumption.

Method used

A compound absorbent composed of an alkanolamine absorbent, a physical solvent, and a catalytic catalytic agent is used to achieve efficient dissolution, mass transfer, and catalytic hydrolysis through a steric hindrance effect-group synergistic mechanism, forming a synergistic reaction pathway of dissolution-transfer-catalytic hydrolysis-chemical absorption.

Benefits of technology

It significantly improved the desulfurization and decarbonization rates of blast furnace gas, reduced the amount of CO2 co-absorption, simplified the process, reduced energy consumption, and achieved the effects of highly selective desulfurization and low decarbonization.

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Abstract

The invention relates to a selective desulfurization absorbent, system and process for blast furnace gas with a high carbon-sulfur ratio. The absorbent comprises a main agent and an additional additive accounting for 0.01-0.8% of the total mass of the main agent, the main agent comprises the following components in percentage by mass: 5-15% of an alcohol amine absorbent, 30-50% of a physical solvent, 25-45% of a catalytic promoter and the balance of water; wherein the physical solvent contains a sulfur-containing functional group or an ether-containing functional group; the catalytic promoter comprises a sterically hindered amine or a cyclic amine. According to the invention, the alkylol amine absorbent with stable performance is matched with the physical solvent with similar compatibility characteristics and the catalytic promoter with steric hindrance effect, and efficient dissolution, intraphase mass transfer and transfer hydrolysis of organic sulfur are remarkably promoted through a steric hindrance effect-group synergy action mechanism; a synergistic reaction path of dissolution-transfer-catalytic hydrolysis-chemical absorption is formed, so that the effects of selectively and highly desulfurizing and reducing the co-absorption amount of carbon are achieved, and the energy consumption of a subsequent process is favorably reduced.
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