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Regenerating flue‐gas desulfurizing agents by bipolar membrane electrodialysis
Author(s) -
Huang Chuanhui,
Xu Tongwen,
Jacobs Mona L.
Publication year - 2006
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.10569
Subject(s) - electrodialysis , chemistry , flue gas , piperazine , flue gas desulfurization , stack (abstract data type) , electrolyte , membrane , sulfate , sodium sulfate , chemical engineering , inorganic chemistry , sodium , organic chemistry , engineering , biochemistry , electrode , computer science , programming language
An experimental study was carried out on the regeneration of a flue‐gas desulfurizing agent by using bipolar membrane electrodialysis (BMED) with sodium sulfate (Na 2 SO 4 ) as the supporting and rinsing electrolyte, and piperazine sulfate (Pz·H 2 SO 4 ) as a model compound for the heat stable salt formed in the process of desulfurizing. The results indicate that the low energy consumption and high current efficiency are achieved when applying electrolyte solutions with a concentration range about 0.3∼0.4 mol/L, piperazine sulfate solution with a concentration range about 0.08∼0.13 mol/L, and BMED stack of BP‐C‐C configuration. The results also indicate that when applying a high current density to the BMED stack, it has a high current efficiency and energy consumption. The process cost is estimated to be $0.96/kg Pz for the regeneration of piperazine with the laboratory‐scale experimental equipment, indicating that the process is not only scientifically novel but also economically feasible and attractive besides its potential environmental benefits. © 2005 American Institute of Chemical Engineers AIChE J, 2006