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Synthesis and testing of zeolite from industrial-waste coal fly ash as sorbent for water adsorption from ethanol solution
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Document Title
Synthesis and testing of zeolite from industrial-waste coal fly ash as sorbent for water adsorption from ethanol solution
Author
Panitchakarn P., Klamrassamee T., Laosiripojana N., Viriya-Empikul N., Pavasant P.
Name from Authors Collection
Affiliations
Department of Chemical Engineering, Chulalongkorn University, Bangkok 10330, Thailand; The Joint Graduate School of Energy and Environment, CHE Center for Energy Technology and Environment, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand; National Nanotechnology Center, National Science and Technology Development Agency, Pathum Thani 12120, Thailand
Type
Article
Source Title
Engineering Journal
ISSN
01258281
Year
2014
Volume
18
Issue
1
Page
01-Dec
Open Access
Bronze, Green
DOI
10.4186/ej.2014.18.1.1
Abstract
In the present work, zeolite was prepared from industrial-waste coal fired ash (CFA) by fusion technique with and without acid-washing pretreatment under various conditions. The synthesized materials were then tested for water adsorption from bioethanol solution with an aim to produce a high purity ethanol (>99.5%) for later utilization in gasohol production manufacturing. From our studies, it was found that the impurities (i.e., Fe2O3, TiO2, MgO, CaO, K2O and SO3) in CFA could be efficiently removed by acid-washing pretreatment. Among three different acids studied (i.e. HCl, HNO3, and H2SO4), HCl exhibited the highest pretreatment performance, while the most suitable pretreatment conditions to enhance high purity raw material (up to 85% purity) were by using 20%HCl with the acid to CFA ratio of 25 mlHCl/gCFA at 80°C for 3 h. After fusion at 550oC with NaOH/CFA mass ratio of 2.25 and further crystallization at 90oC for 4 h, the pretreated CFA was converted to zeolite; from which the main phases were sodium aluminum silicate hydrate (1.08Na2O•Al2O3•1.68SiO2•1.8H2O) and faujasite-Na (Na2Al2Si2.4O8.8•6.7H2O). Regarding water adsorption testing, the synthesized zeolite provided comparable adsorption performance with the commercial grade molecular sieve. Under three adsorption cycles testing at 85°C, high ethanol purity (99.8%) could be achieved without deactivation being observed.
Keyword
Bioethanol | Coal fly ash | Fusion | Water adsorption | Zeolite
License
CC BY-NC-ND
Rights
EJ
Publication Source
Scopus