NDLI: Capture of CO2 from high humidity flue gas by vacuum swing adsorption with zeolite 13X

Content Provider	Springer Nature Link
Author	Li, Gang Xiao, Penny Webley, Paul Zhang, Jun Singh, Ranjeet Marshall, Marc
Copyright Year	2008
Abstract	Capture of CO2 from flue gas streams using adsorption processes must deal with the prospect of high humidity streams containing bulk CO2 as well as other impurities such as SO x , NO x , etc. Most studies to date have ignored this aspect of CO2 capture. In this study, we have experimentally examined the capture of CO2 from a 12% synthetic flue gas stream at a relative humidity of 95% at 30 °C. A 13X adsorbent was used and the migration of the water and its subsequent impact on capture performance was evaluated. Binary breakthrough of CO2/water vapor was performed and indicated a significant effect of water on CO2 adsorption capacity, as expected. Cyclic experiments indicate that the water zone migrates a quarter of the way into the column and stabilizes its position so that CO2 capture is still possible although decreased. The formation of a water zone creates a “cold spot” which has implications for the system performance. The recovery of CO2 dropped from 78.5% to 60% when moving from dry to wet flue gas while the productivity dropped by 22%. Although the concentration of water leaving the bed under vacuum was 27%(vol), the low vacuum pressure prevented condensation of water in this stream. However, the vacuum pump acted as a condenser and separator to remove bulk water. An important consequence of the presence of a water zone was to elevate the vacuum level thereby reducing CO2 working capacity. Thus although there is a detrimental effect of water on CO2 capture, long term recovery of CO2 is still possible in a single VSA process. Pre-drying of the flue gas steam is not required. However, careful consideration of the impact of water and accommodation thereof must be made particularly when the feed stream temperature increases resulting in higher feed water concentration.
Starting Page	415
Ending Page	422
Page Count	8
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	14
Issue Number	2-3
e-ISSN	15728757
Language	English
Publisher	Springer US
Publisher Date	2008-01-16
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CO2 capture Pressure swing adsorption Humid flue gas Engineering Thermodynamics, Transport Phenomena Industrial Chemistry/Chemical Engineering Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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