Synthesis and testing of zeolite from industrial-waste coal fly ash as sorbent for water adsorption from ethanol solution
บทความในวารสาร
ผู้เขียน/บรรณาธิการ
กลุ่มสาขาการวิจัยเชิงกลยุทธ์
ไม่พบข้อมูลที่เกี่ยวข้อง
รายละเอียดสำหรับงานพิมพ์
รายชื่อผู้แต่ง: Panitchakarn P., Klamrassamee T., Laosiripojana N., Viriya-Empikul N., Pavasant P.
ผู้เผยแพร่: Faculty of Engineering
ปีที่เผยแพร่ (ค.ศ.): 2014
วารสาร: Engineering Journal (0125-8281)
Volume number: 18
Issue number: 1
หน้าแรก: 1
หน้าสุดท้าย: 12
จำนวนหน้า: 12
นอก: 0125-8281
eISSN: 0125-8281
ภาษา: English-Great Britain (EN-GB)
บทคัดย่อ
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.
คำสำคัญ
Fusion, Water adsorption
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