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Advanced Technologies In Biodiesel by Yun Hin Taufiq-Yap, Aminul Islam

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CHAPTER 3

Biodiesel Production Processes

Several processes for biodiesel production have been developed (Figure 3.1). At present, the majority of biodiesel plants are operated either in batch or continuous mode using conventional homogeneous acid or alkali-based transesterification conversion technology. In homogeneous catalysis, alkali-catalyst is much suited for the transesterification of vegetable oils because the process proceeds much rapid than the acid-catalyzed reaction whereby acid-catalyst is usually used for the esterification of free fatty acid (FFA). Due to the fact that the alkali-catalysts are less corrosive than acid catalysts, alkali-catalysts such as sodium hydroxides (NaOH), sodium methylate, alkali metal alkoxides, sodium, ...

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