Thermodynamic and mass transfer modeling of carbon dioxide absorption into aqueous 2-amino-2-methyl-1-propanol

Sherman, Brent J.; Rochelle, Gary T.

doi:10.1021/acs.iecr.6b03009

Thermodynamic and mass transfer modeling of carbon dioxide absorption into aqueous 2-amino-2-methyl-1-propanol

Journal Article · Fri Dec 16 00:00:00 EST 2016 · Industrial and Engineering Chemistry Research

DOI:https://doi.org/10.1021/acs.iecr.6b03009· OSTI ID:1337599

^[1]; Rochelle, Gary T. ^[2]

The Univ. of Texas at Austin, Austin, TX (United States); The University of Texas at Austin
The Univ. of Texas at Austin, Austin, TX (United States)

Explanations for the mass transfer behavior of 2-amino-2-methyl-1-propanol (AMP) are conflicting, despite extensive study of the amine for CO₂ capture. At equilibrium, aqueous AMP reacts with CO₂ to give bicarbonate in a 1:1 ratio. While this is the same stoichiometry as a tertiary amine, the reaction rate of AMP is 100 times faster. This work aims to explain the mass transfer behavior of AMP, specifically the stoichiometry and kinetics. An eNRTL thermodynamic model was used to regress wetted-wall column mass transfer data with two activity-based reactions: formation of carbamate and formation of bicarbonate. Data spanned 40–100 C and 0.15–0.60 mol CO₂/mol alk). The fitted carbamate rate constant is three orders of magnitude greater than the bicarbonate rate constant. Rapid carbamate formation explains the kinetics, while the stoichiometry is explained by the carbamate reverting in the bulk liquid to allow CO₂ to form bicarbonate. Understanding the role of carbamate formation and diffusion in hindered amines enables optimizing solvent amine concentration by balancing viscosity and free amine concentration. Furthermore, this improves absorber design for CO₂ capture.

View Accepted Manuscript (DOE)

Research Organization:: The Univ. of Texas at Austin, Austin, TX (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0013118

OSTI ID:: 1337599

Journal Information:: Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research; ISSN 0888-5885

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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