Absorbing solvent for capturing or separating carbon dioxide from gas mixture or liquid gas

Abstract

The invention pertains to the field of chemical materials and in particular relates to a sorption solvent which catches or separates carbon dioxide from gaseous mixtures or liquefied gases. The solvent comprises n-propanolamine with a content range of 5-60wt% and other components with a total content range of 40-95wt%; other components comprise monoethanol amine, diethanolamine, methyl diethanolamine, diisopropanol amine, 2-amido-2-methyl-1-propyl alcohol, organic amine, water, physical solvent, inorganic salt and one or more accessory ingredients. The number of carbon atoms between the amidocyanogen and the hydroxide radical of the n-propanolamine is three; nitrogen atoms can form a hydrogen bond with the hydrogen atoms on oxygen atoms, or oxygen atoms can form a hydrogen bond with the hydrogen atoms on nitrogen atoms, thus forming a ring structure composed of six atoms; such molecular structure is similar to that of secondary amine, can reduce the formation of amino carbonates and improve the solubility and desorption degree of CO2; meanwhile, the formation of the six-element ring molecular structure increases the stability of molecular and can reduce the degradation loss of solvents in service process.

Description

technical field [0001] The invention belongs to the field of chemical materials, in particular to a method for capturing or separating carbon dioxide (CO2) from gas mixtures or liquefied gases. 2 ) of the absorbing solvent. Background technique [0002] CO 2 Emissions of greenhouse gases such as greenhouse gases are a major factor causing climate change, how to enrich CO 2 capture or separation of CO in a gas mixture or liquefied gas 2 becomes extremely important. These gas mixtures include flue gas, refinery gas, natural gas, liquefied gas, synthesis gas, shift gas and hydrogen production gas, among others. The gas mixture contains 5% to 80% CO 2 , other major gas components include N 2 , O 2 , CO, H 2 、CH 4 、C 2 h 6 , SO 2 、H 2 S and organic sulfur CH 3 S, COS, etc.; the pressure range of the gas is large (50-9000kPa), suitable for capturing and separating CO by chemical absorption or chemical-physical composite absorption 2 components. [0003] At present,...

AI Technical Summary

Problems solved by technology

However, due to the special structure of these hindered amines, the degradation during use is relatively large, and the cost of use is still high

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