The acid value for my west cooking oil is 18.4 .So can I use base catalyst for biodiesel?
or can I use catalyst with 2 function acid and base ?
Both acid and base catalysts can be used for biodiesel preparation via esterification or transesterification.
See attached for a review of solid acid and base catalysts for biodiesel synthesis.
Article ChemInform Abstract: Heterogeneous Catalysis for Sustainable...
Since acid value of your oil is very high, two-step process is required for biodiesel production. First step: Acid catalyzed esterification reaction to bring down acid value of oil to less than 4. Second step: Base catalyzed transesterification to produce trialkyl esters (biodiesel).
Lot of literatures available on this topic. Please refer.
Hi Selvaraju Sivamani
thank you for you commend
But on the literatures they reported the first step with acid catalyst then the second with base cat. because if you using the base cat first it will saponified the FFA so first we need to use the Acid cat to change the FFA to the methyl aster then WE use the base cat.
thanks
Usually for waste cooking oil base catalyst is preferred due to soap formation when reacting with Methanol as a acyl acceptor. To avoid this u can change your acyl acceptor such as methyl acetate or ethyl acetate so there is no formation of glycerol
you have to subject your oil with high FFA to acid esterification prior base transesterification to avoid soap formation
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