High-selectivity compound desulfurizer and preparation method thereof

Abstract

The invention specifically relates to a high-selectivity compound desulfurizer and a preparation method thereof, belonging to the field of gas purification techniques. The high-selectivity compound desulfurizer comprises the following raw materials by weight: 60-80 parts of N-methyldiethanolamine, 1-3 parts of an eutectic solvent, 10-30 parts of sterically hindered amine, 0.5-1.5 parts of a non-silicon defoaming agent and 4-8 parts of an antioxidant. The compound desulfurizer provided by the invention overcomes the shortcomings of current refinery gas desulfurization processes, and is simple in process and applicable to desulfurization of most refinery acidic gases. According to the invention, N-methyldiethanolamine, the eutectic solvent and sterically hindered amine are compounded, and the supplementation effect and synergism of the above three components enhance the respective desulfurization effect of the components; and the high-selectivity compound desulfurizer has high purification depth, large absorption capacity, low energy consumption for regeneration, environment friendliness and other advantages.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and in particular relates to a highly selective compound desulfurizer and a preparation method thereof. Background technique [0002] Hydrogen sulfide and SO are produced in refineries and other industries as processed crude oil deteriorates x The proportion of sulfur-containing compounds such as sulfur compounds continues to increase. The existence of sulfides can not only corrode equipment and pipelines, cause catalyst poisoning, but also pollute the environment and cause harm to the human body. It must meet national standards before transportation and processing; It is an essential raw material for chemical industry, and it is particularly important to recover efficiently and selectively. Therefore, sulfides in refinery gas need deep purification and removal, especially in high-content CO 2 case, for H 2 Highly selective removal of S is very important. [0003] N-methyldiethanolam...

AI Technical Summary

Problems solved by technology

[0004] With the aggravation of energy shortage and the increasing requirements of environmental protection, the requirements for selective desulfurization are also getting higher and higher. However, the current compound desulfurizers still have low solution concentration, easy foaming, and limited absorption capacity. The removal efficiency of other organic sulfur is low, and the content of degradation and corrosion products in the solution is still high, and the regeneration conditions are not strictly controlled, etc.

The existing desulfurizers can no longer meet the requirements, and it is imperative to develop a new type of desulfurizer that can meet stricter environmental regulations and has high selectivity and deep purification

[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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