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Kinetic evaluation of sterically hindered amines under partial oxy‐combustion conditions
Author(s) -
Camino Sara,
Vega Fernando,
Gallego Fernández Luz M,
Cano Mercedes,
Camino José A,
Navarrete Benito
Publication year - 2020
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6351
Subject(s) - steric effects , flue gas , chemistry , amine gas treating , combustion , absorption (acoustics) , solvent , kinetic energy , kinetics , carbon fibers , partial pressure , organic chemistry , materials science , oxygen , physics , quantum mechanics , composite material , composite number
BACKGROUND Carbon capture and storage is considered one of the pillars that should support greenhouse gas (GHG) emission mitigation by 2050. In this sense, partial oxy‐combustion emerges as a promising alternative. Its advantages rely on the production of a higher CO 2 concentration flue gas than these provided by conventional air‐firing processes. The use of higher CO 2 concentrations should improve the solvent kinetic and the CO 2 cyclic capacity. RESULTS The kinetic behaviour of two representative sterically hindered amines, namely 2‐amino‐2‐methyl‐1‐propanol (AMP) and isophrondiamine (IF), were studied under partial oxy‐combustion conditions in a laboratory‐scale semi‐batch reactor. The CO 2 concentration varied from 15%v/v to 60%v/v. The kinetic enhancement experienced by AMP at high CO 2 concentration was slightly >60%, instead of 70–80% for IF. AMP also improved its CO 2 absorption capacity by 24.7%, from 15%v/v to 60%v/v, almost doubled the improvements achieved by monoethanolamine (MEA). In the case of IF experiments, the CO 2 loading increased ≈10% from 15%v/v to 60%v/v CO 2 and it changed from 1.10 to 1.34 mol CO 2 mol –1 solvent, representing a >20% increase. CONCLUSIONS The presence of higher CO 2 concentrations accelerated CO 2 absorption and provided higher CO 2 absorption rates. In addition, the evolution of the CO 2 loading also exhibited higher values in the experiments using higher CO 2 concentration flue gas. The steric hindrance causes a hybrid behaviour in these solvents, between both fast and slow kinetic solvents. The kinetic rates observed using AMP were slightly higher than MEA, but lower than IF which showed the fastest kinetics. © 2020 Society of Chemical Industry