Abstract
A new blending recipe of a polyamine-based solvent for capturing post-combustion CO2 was proposed, and its performance and characteristics were investigated using a pilot-scale carbon capture process (PCCP). The proposed solvent is a blend of three types of amines and was designed to separate the solvent roles into those of a main amine, auxiliary amine, and reaction-rate-enhancing amine. Polyamine 3,3′-iminobis (N, N-dimethylpropylamine) was selected as the main amine given its ability to capture large amounts of CO2. 2-Amino-2-methyl-1-propanol was used as the auxiliary amine, with piperazine added as the reaction-rate-enhancing amine. This solvent was tested in a PCCP that can handle 150 Nm3/h of flue gas. The proposed solvent was found to operate stably while consuming substantially lower reboiler duty than the monoethanolamine (MEA) 30 mass% solvent.
Highlights
Humankind faces an unprecedented challenge with regard to achieving climate objectives.Without carbon capture and storage (CCS), this challenge becomes infinitely greater [1]
Different experimental methods were used with the continuous flow bubbling reactor (CFBR) depending on the equilibrium CO2 partial pressure above and below 1 kPa
More details on the CFBR method can be found in Kim et al [11]
Summary
Humankind faces an unprecedented challenge with regard to achieving climate objectives. Without carbon capture and storage (CCS), this challenge becomes infinitely greater [1]. CCS is a technology capable of capturing CO2 from large-scale CO2 emission sources and storing it in the ground. Post-combustion capture processes can be classified into three types: absorption, adsorption, and membrane technologies. The most commercially available technique is absorption, which typically uses various amine solvents [2,3,4]. The types of amines used in the solvents are divided into primary, secondary, and tertiary amines [5]. CO2 absorption is achieved with primary and secondary amines through a carbamate reaction and with tertiary amines through a bicarbonate reaction [6]
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