Comprehensive reaction kinetics model of CO₂ absorption into 1‐dimethylamino‐2‐propanol solution

Abstract

In the present work, the kinetics of the reactive absorption of CO 2 in 1-dimethylamino-2-propanol (1DMA2P) solution were experimentally measured using a laminar jet absorber over a temperature range of 298-313 K, 1DMA2P concentration range of 0.5-2.0 mol/L, and CO 2 loading range of 0-0.06 mol CO 2 /mol amine. The measured kinetics data were then used to develop a comprehensive numerical kinetics model using a FEM-based COMSOL software. The reaction rate model of the CO 2 absorption into 1DMA2P solution were then validated by comparing model rates with the experimental rates. An excellent agreement of model data with experimental data was achieved with an absolute average deviation (AAD) of 6.5%. In addition, vapor-liquid equilibrium plots of all ions in the 1DMA2P-H 2 O-CO 2 system were also developed. Further, this work has provided an effective criterion for evaluating CO 2 absorption, that can be used for both the conventional amines and alternative amines for the purpose of providing guidelines or information on how to effectively screen solvents.

Enhancing CO2 Absorption with Compact Multiflow Absorber: Evaluation of Operational Factors

“…According to the zwitterion mechanism, the reaction of alcoholamines with CO 2 occurs in two steps. 37 The first step involves the reaction of CO 2 with the amine solution (RNH 2 ) to form the zwitterion intermediate (RNH 2+ COO − ), as shown in eq 13. This intermediate then undergoes a deprotonation reaction with any base (B) in the system, forming the carbamate ion and the protonated base (B + ), as illustrated by eq 14.…”

“…This mechanism provides a clear explanation for the reaction between an alcoholamine solution and CO 2 . According to the zwitterion mechanism, the reaction of alcoholamines with CO 2 occurs in two steps . The first step involves the reaction of CO 2 with the amine solution (RNH 2 ) to form the zwitterion intermediate (RNH 2+ COO – ), as shown in eq .…”

Solubility of N2O and CO2 in Dimethyl Sulfoxide, 2-(Butylamino)ethanol, and Their Water-Lean Blends

“…Carbon dioxide capture and storage (CCS) is regarded as a feasible solution to reduce CO 2 emission from fossil fuel-fired power plants for the carbon neutrality target worldwide. Physical solubility of CO 2 is an important parameter, which can calculate the CO 2 concentration at the gas–liquid interface for reaction kinetics and precise process design of novel absorbents. − Undoubtedly, for amine-based physical–chemical absorbents, the physical solubility of CO 2 in these solutions cannot be measured directly due to the occurrence of chemical reaction between basic amines with acidic CO 2 . Fortunately, N 2 O and CO 2 are alike in many aspects such as molecular volume, configuration, and electronic structure. , It has been proven that N 2 O does not react with amines in the literature .…”

A new look to the old solvent: Mass transfer performance and mechanism of CO2 absorption into pure monoethanolamine in a spray column

“…Increase in mass transfer rate with increasing amine concentrations was also shown in another study although this was not the focus of the study. Liu et al [18] studied the kinetics of another amine (1dimethylamino-2-propanol, 1DMA2P) solution in a spray reactor. Enhancement factor, which was defined as the ratio of the absorption rate of a gas when chemical reaction was considered over the absorption rate without the chemical reaction, increased with increasing amine concentration.…”