High-selectivity desulfurization system and compounding method of desulfurization agent of high-selectivity desulfurization system

Abstract

The present invention provides a high-selectivity eutectic compounding desulfurization agent, and relates to high selectivity removal of sulfides from acid gases during chemical industry production. The system comprises an absorption unit, a rich and poor liquid heat exchange unit and a desorption unit. The desulfurization absorber is a high-selectivity desulfurization compounding solvent, and is formed by compounding 40-50 wt% of N-methyldiethanolamine (MDEA), 1-5 wt% of an eutectic solvent (DES), and 45-59 wt% of water. According to the present invention, the eutectic solvent is firstly used for the removal of industrial gas H2S, wherein the H2S content after desulfurization is less than 10 ppm (the H2S recovery rate of the sulfur recovery apparatus is more than 80% and the CO2 content is less than 20 ppm); the desulfurization system has advantages of high purification degree, large absorption capacity, low regenerative energy consumption, and the like; and the eutectic desulfurization agent is non-toxic, green, and environmentally friendly, and high economic and social benefits are provided.

Description

technical field [0001] The invention relates to the technical field of desulfurization of coke oven gas, natural gas and other industrial gases, in particular to a high-selectivity desulfurization system and a compounding method of the desulfurizer. Background technique [0002] In industrial processes such as the purge gas in the production of synthetic ammonia or methanol, the associated gas produced in petroleum refining, and the purification of natural gas, a considerable amount of acid gas is often produced, and its main component is H 2 S, CO 2 , where H 2 Although the S content is not high, it will seriously endanger the survival of earth organisms and human health. On the one hand, the H in the process gas 2 If the removal of S is not clean, it will not only corrode the equipment and poison the catalyst, but also threaten the safety of personnel. On the other hand, H 2 S is another important sulfur resource, and the recycled H 2 S can be used to produce sulfuri...

AI Technical Summary

Problems solved by technology

At present, the common medium and high pressure absorbing H 2 The S method usually includes: low-temperature methanol washing method, alcohol amine method, and propylene carbonate method. The common problems of these methods are that the capture energy consumption and cost are high, and the quality of sulfur element is poor, which may cause secondary pollution.

However, it does not consider the influence of desulfurizers on the analytical performance

[0005] In summary, although the existing MDEA and sterically hindered amine desulfurization solutions have their own characteristics, their desulfurization purification degree is low, the solvent loss is large, and the viscosity is high, which is not conducive to industrial application.

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