Biodiesel production using solid base catalyst in packed-bed reactor
Date Issued
2009
Date
2009
Author(s)
Hsieh, Li-Shan
Abstract
Biodiesel is an alternative fuel of diesel engine. The chemical structure of biodiesel is fatty acid ester. It can be produced by transesterification from triglyceride. Calcium oxide shows good catalytic activity in transesterification for biodiesel production, but the active surface sites of CaO are unavoidably poisoned by the atmospheric H2O and CO2. Previous studies reported that, Ca(C3H7O3)2 structure formed during transesterification by CaO and by-produced glycerol was tolerant to air-exposure and was reused without deactivation. In this research, Ca(C3H7O3)2/CaCO3 solid base catalyst was prepared. The advantage of Ca(C3H7O3)2/CaCO3 was that the particle surface was provided with Ca(C3H7O3)2 when the core remains CaCO3 to maintain the mechanical strength. Packed-bed reactor was used for continuous production of biodiesel. Reaction parameters including methanol to oil ratio, reaction temperature, residence time and reusability were discussed. Using the assumptions of differential reactor to determine the rate of reaction showed that Langmuir-Hinshelwood mechanism could be used to describe the rate equation.
Subjects
biodiesel
solid base catalyst
packed-bed
Type
thesis
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