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Table 2 Variables factors considered for transesterification of T. peruviana oil to biodiesel

From: Brette Pearl Spar Mable (BPSM): a potential recoverable catalyst as a renewable source of biodiesel from Thevetia peruviana seed oil for the benefit of sustainable development in West Africa

Variable Symbol Coded factor levels
   -1 0 +1
Catalyst amount (g) X1 2.00 4.00 6.00
Reaction time (min) X2 50 60 70
Methanol/oil ratio (v/v) X3 0.10 0.15 0.20