Steric hindered amine compound desulfurizer

Abstract

The invention discloses a steric hindered amine compound desulfurizer. The steric hindered amine compound desulfurizer is an aqueous solution which takes 2-[2-(1-ethylpropyl)amino]ethoxyethanol and 1,3-di(dimethylamino)-2-propanol as main effective components, wherein the concentration of total amine in the solution is 10 to 40 wt% and the mol ratio of the 2-[2-(1-ethylpropyl)amino]ethoxyethanol to the 1,3-di(dimethylamino)-2-propanol to N-methyldiethanolamine is (1.5 to 4) to (1 to 3) to 1. The steric hindered amine compound desulfurizer disclosed by the invention can be used for effectivelyremoving organic and inorganic sulfide in sulfur-containing gas, and the removal selectivity on the sulfide is better than that of a conventional desulfurization solvent; the steric hindered amine compound desulfurizer has a good desulfurization effect and a small hydrocarbon common absorption amount.

Description

technical field [0001] The invention relates to a hindered amine composite desulfurizer. Background technique [0002] Since the industrialization of amine desulfurization in the early 1930s, it has been the main method for desulfurization from industrial gas streams such as natural gas, refinery gas, and synthetic gas. Initially, organic amines such as monoethanolamine (MEA) and diethanolamine (DEA) were used for desulfurization . With the continuous development of the amine process, a variety of alternative desulfurizers have been formed. Diisopropanolamine (DIPA) was used in the 1960s; N-methyldiethanolamine (MDEA) was successfully used as a desulfurizer in the late 1970s and early 1980s. [0003] Since the 21st century, some oil refining companies, natural gas, and shale gas purification companies have introduced groups with large steric hindrance constants (-Es) into amine molecules in order to seek desulfurization solvents with better activity and selectivity, which ...

AI Technical Summary

Problems solved by technology

Currently, the widely used desulfurizers MDEA and H 2 S forms stable acid-base complexes in water, but it also interacts with CO present in large quantities in the air 2 Acid-base complexes are formed, which affect the H 2 S uptake

In recent years, high CO 2 The content of gas is increasing, and MDEA as a selective desulfurizer is increasingly unable to meet the requirements for higher CO 2 content gas treatment needs

Moreover, the two primary hydroxyl groups in the MDEA molecule make it prone to oxidation, degradation and other irreversible changes during use, and it is also easy to complex with metal ions, high surface viscosity, easy to foam, and easy to bring disadvantages to the operation of large devices influences

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