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Measuring the Absorption Rate of CO 2 in Nonaqueous CO 2 ‐Binding Organic Liquid Solvents with a Wetted‐Wall Apparatus
Author(s) -
Mathias Paul M.,
Zheng Feng,
Heldebrant David J.,
Zwoster Andy,
Whyatt Greg,
Freeman Charles M.,
Bearden Mark D.,
Koech Phillip
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500288
Subject(s) - chemistry , solubility , aqueous solution , absorption (acoustics) , piperazine , solvent , kinetics , mass transfer coefficient , mass transfer , alcohol , chemical engineering , thermodynamics , analytical chemistry (journal) , organic chemistry , materials science , chromatography , physics , quantum mechanics , engineering , composite material
The kinetics of the absorption of CO 2 into two nonaqueous CO 2 ‐binding organic liquid (CO 2 BOL) solvents were measured at T =35, 45, and 55 °C with a wetted‐wall column. Selected CO 2 loadings were run with a so‐called “first‐generation” CO 2 BOL, comprising an independent base and alcohol, and a “second‐generation” CO 2 BOL, in which the base and alcohol were conjoined. Liquid‐film mass‐transfer coefficient ( k ′ g ) values for both solvents were measured to be comparable to values for monoethanolamine and piperazine aqueous solvents under a comparable driving force, in spite of far higher solution viscosities. An inverse temperature dependence of the k ′ g value was also observed, which suggests that the physical solubility of CO 2 in organic liquids may be making CO 2 mass transfer faster than expected. Aspen Plus software was used to model the kinetic data and compare the CO 2 absorption behavior of nonaqueous solvents with that of aqueous solvent platforms. This work continues our development of the CO 2 BOL solvents. Previous work established the thermodynamic properties related to CO 2 capture. The present paper quantitatively studies the kinetics of CO 2 capture and develops a rate‐based model.