Enhancement of Gas Desulfurization with Hydrated Lime at Low Temperature by the Presence of NO2

• Published in: Industrial & engineering chemistry research Vol. 44; no. 24; pp. 9040 - 9049
• Main Authors: Bausach, M, Pera-Titus, M, Fité, C, Cunill, F, Izquierdo, J. F, Tejero, J, Iborra, M
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 23.11.2005
• Subjects: Applied sciences; Chemical engineering; Exact sciences and technology; Desulfurization; Low temperature
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/ie050713w

The effect of NO2 on the desulfurization reaction of simulated flue gas by Ca(OH)2 was investigated in a fixed-bed reactor at 333−353 K and at relative humidities (RHs) in the range of 30%−70%. NO2 was determined to be a promoter for SO2 uptake, because its retention can be increased up to 200%. The effect of NO2 and O2 concentration on the kinetics of the desulfurization reaction was surveyed and successfully simulated by means of a deactivation model implemented with an inverse shrinking-core model (DM-ISCM). Solid analyses were also performed to identify the reaction products and provide insight into the chemistry of the process.