TY - JOUR
T1 - Hydrothermal synthesis of zeolite production from coal fly ash
T2 - A heuristic approach and its optimization for system identification of conversion
AU - Tauanov, Zhandos
AU - Shah, Dhawal
AU - Inglezakis, Vassilis
AU - Jamwal, Prashant K.
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/5/1
Y1 - 2018/5/1
N2 - Commercialization of synthetic zeolites has given considerable impetus to optimization of its production routes. The preferred production route involves hydrothermal treatment of coal fly ash in a strong alkali solution. The process involves several parameters, such as reaction temperature, time, the concentration and amount of alkali solution, and silica content in the fly ash, all of which strongly and non-monotonically affect the conversion. We herein perform several experiments with the Kazakhstani fly ash, and obtained a highest conversion of zeolites of 78% using 3 M NaOH at 110 °C. Further, we propose a conversion model using zero-order Takagi-Sugeno fuzzy system to analyze the effect of individual process parameters on conversion, and thereby, the reaction mechanism(s) of zeolite formation. The model is designed and developed, using the data, both from literature and our experiments on Kazakhstani fly ash. The obtained results clearly illustrate that the model accurately predict the conversion percentage of zeolite for a given set of reaction parameters. The model is further optimized to provide accurate inferences and an average deviation between the model predictions and experimental values for zeolite yield is observed to be less than 5%.
AB - Commercialization of synthetic zeolites has given considerable impetus to optimization of its production routes. The preferred production route involves hydrothermal treatment of coal fly ash in a strong alkali solution. The process involves several parameters, such as reaction temperature, time, the concentration and amount of alkali solution, and silica content in the fly ash, all of which strongly and non-monotonically affect the conversion. We herein perform several experiments with the Kazakhstani fly ash, and obtained a highest conversion of zeolites of 78% using 3 M NaOH at 110 °C. Further, we propose a conversion model using zero-order Takagi-Sugeno fuzzy system to analyze the effect of individual process parameters on conversion, and thereby, the reaction mechanism(s) of zeolite formation. The model is designed and developed, using the data, both from literature and our experiments on Kazakhstani fly ash. The obtained results clearly illustrate that the model accurately predict the conversion percentage of zeolite for a given set of reaction parameters. The model is further optimized to provide accurate inferences and an average deviation between the model predictions and experimental values for zeolite yield is observed to be less than 5%.
KW - Coal fly ash
KW - Heuristic methods
KW - Hydrothermal production
KW - Zeolites
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U2 - 10.1016/j.jclepro.2018.02.047
DO - 10.1016/j.jclepro.2018.02.047
M3 - Article
AN - SCOPUS:85043591406
SN - 0959-6526
VL - 182
SP - 616
EP - 623
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
ER -