Liquid composition capable of removing sulfide in gas

Abstract

The invention provides a liquid composition for removing sulfide in gas, which consists of an absorbent, an auxiliary agent and an antifoaming agent, wherein the absorbent consists of steric hindrance amine and alkanolamine; the auxiliary agent is one or a mixture of thiazoles, fatty amine and phenols; and the antifoaming agent is siloxane. The liquid composition comprises the following components in percentage by weight: 29 to 89 percent of absorbent, 10 to 70 percent of auxiliary agent and 0.01 to 1 percent of antifoaming agent. The liquid composition can simultaneously and effectively remove organic sulfur and inorganic sulfur in the gas, has obvious desulfurization effect, can effectively protect production equipment, and reduces the loss and the maintenance cost.

Description

technical field [0001] The invention relates to a gas purifying agent, in particular to a desulfurizing agent for removing sulfide in gas. Background technique [0002] Whether it is coal gas, refinery gas or natural gas, it usually contains different amounts of inorganic sulfur and organic sulfide, of which H 2 S content is generally 1 ~ 2g / m 3 , a few can be as high as 5 ~ 10g / m 3 . SO 2 The content is generally 0.1 ~ 5g / m 3 . The content of organic sulfur is 0.5~0.8g / m 3 , and its forms include COS, mercaptan, thioether, and difficult-to-remove thiophene. [0003] The existence of sulfide and cyanide in refinery gas and natural gas will cause corrosion of equipment and pipelines; it will cause poisoning and deactivation of chemical reaction catalysts, directly affecting the yield and quality of final products. When it is used as civil fuel, the sulfur compounds in the exhaust gas will pollute the environment and endanger human health. Therefore, whether it is use...

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Problems solved by technology

However, the methods of using hindered amine desulfurization described in the above documents have some drawbacks

Wherein CN 1125158 A uses different components to selectively remove H 2 S and CO 2 , due to the small hindrance coefficient of the sterically hindered amine used, the selectivity of desulfurization is low, and organic sulfur such as mercaptans and thioethers cannot be removed at the same time

CN 1421264 A can remove H 2 S, COS, mercaptan, sulfide, but its alkalinity is strong, desulfurization also removes CO 2 ; Some components cannot be easily obtained, and the cost is high; it does not have anti-corrosion ability, and cannot effectively protect the production equipment; it is easy to generate foam, which affects the desulfurization efficiency

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