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Aqueous Ethylenediamine for CO 2 Capture
Author(s) -
Zhou Shan,
Chen Xi,
Nguyen Thu,
Voice Alexander K.,
Rochelle Gary T.
Publication year - 2010
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.200900293
Subject(s) - ethylenediamine , aqueous solution , chemistry , piperazine , solvent , degradation (telecommunications) , absorption (acoustics) , amine gas treating , nuclear chemistry , urea , inorganic chemistry , organic chemistry , materials science , telecommunications , computer science , composite material
Aqueous ethylenediamine (EDA) has been investigated as a solvent for CO 2 capture from flue gas. EDA can be used at 12 M (mol kg −1 H 2 O) with an acceptable viscosity of 16 cP (1 cP=10 −3 Pa s) with 0.48 mol CO 2 per equivalent of EDA. Similar to monoethanolamine (MEA), EDA can be used up to 120 °C in a stripper without significant thermal degradation. Inhibitor A will effectively eliminate oxidative degradation. Above 120 °C, loaded EDA degrades with the production of its cyclic urea and other related compounds. Unlike piperazine, when exposed to oxidative degradation, EDA does not result in excessive foaming. Over much of the loading range, the CO 2 absorption rate with 12 M EDA is comparable to 7 M MEA. However, at typical rich loading, 12 M EDA absorbs CO 2 2 times slower than 7 M MEA. The capacity of 12 M EDA is 0.72 mol CO 2 /(kg H 2 O+EDA) (for P CO 2=0.5 to 5 kPa at 40 °C), which is about double that of MEA. The apparent heat of CO 2 desorption in EDA solution is 84 kJ mol −1 CO 2 ; greater than most other amine systems.