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The analysis of solubility, absorption kinetics of CO 2 absorption into aqueous 1‐diethylamino‐2‐propanol solution
Author(s) -
Liu Helei,
Xiao Min,
Liang Zhiwu,
Tontiwachwuthikul Paitoon
Publication year - 2017
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15621
Subject(s) - solubility , aqueous solution , chemistry , absorption (acoustics) , kinetics , partial pressure , desorption , propanol , catalysis , thermodynamics , analytical chemistry (journal) , materials science , chromatography , organic chemistry , adsorption , ethanol , oxygen , composite material , physics , quantum mechanics
In this present work, the CO 2 absorption performance of aqueous 1‐diethylamino‐2‐propanol (1DEA2P) solution was studied with respect to CO 2 equilibrium solubility, absorption kinetics, and absorption heat. The equilibrium solubility of CO 2 in 2M 1DEA2P solution was measured over the temperature range from 298 to 333 K and CO 2 partial pressure range from 8 to101 kPa. The absorption kinetics data were developed and analyzed using the base‐catalyzed hydration mechanism and artificial neural network models (radial basis function neural network [RBFNN] and back‐propagation neural network [BPNN] models) with an acceptable absolute average deviation of 10% for base‐catalyzed hydration mechanism, 2.6% for RBFNN model and 1.77% for BPNN model, respectively. The CO 2 absorption heat of 1DEA2P was estimated to be −43.6 kJ/mol. In addition, the ions (1DEA2P, 1DEA2PH + ,HCO 3 −, CO 3 2− ) speciation plots of the 1DEA2P‐CO 2 ‐H 2 O system were developed to further understand the reaction process of 1DEA2P with CO 2 . Based on a comparison with conventional amines (e.g., MEA, DEA, MDEA) and alternative amines (i.e., 1DMA2P and 4‐(diethylamino)−2‐butanol [DEAB]), 1DEA2P exhibited good performance with respect to CO 2 equilibrium solubility, reaction kinetics, and CO 2 absorption heat. Meanwhile, the overall evaluation of 1DEA2P for application in CCS in terms of absorption and desorption is presented, giving helpful information for the screening of these novel amines. © 2017 American Institute of Chemical Engineers AIChE J , 63: 2694–2704, 2017