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Numerical investigation on CO 2 absorbed in aqueous N ‐methyldiethanolamine + piperazine
Author(s) -
Huang Jicai,
Gong Maoqiong,
Sun Zhaohu,
Dong Xueqiang,
Shen Jun,
Wu Jianfeng
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.15590
Subject(s) - piperazine , aqueous solution , mass transfer , absorption (acoustics) , chemistry , absorption capacity , thermodynamics , analytical chemistry (journal) , materials science , chromatography , chemical engineering , organic chemistry , physics , engineering , composite material
A multiphase and multicomponent mass transfer model of CO 2 absorbed in aqueous N‐methyldiethanolamine and piperazine (PZ) was built in the study. In the model, a simple method of mass transfer between phases was proposed. Besides, the hydrodynamics, thermodynamics, and complex reversible chemical reaction were considered simultaneously. The model was validated by comparing with the previous experimental data which showed that simulated results can represent the experimental data with reasonable accuracy. Based on the model, the effects of gas velocity, liquid load and CO 2 loading on the absorption rate, and enhancement factor were analyzed. Model results showed that the enhancement factor increased with a rising gas velocity while decreased with a rising liquid load or CO 2 loading. The change of enhancement factor with CO 2 loading was similar to that of equilibrium concentration of PZ which indicated that PZ was significant to the absorption process. Furthermore, the distributions of specie concentrations were discussed in detail. © 2016 American Institute of Chemical Engineers AIChE J , 63: 2386–2393, 2017