Abstract
The present work is aiming at producing the biodiesel from corn waste frying oil and five fresh vegetable oils (com, rapeseed, sunflower, soybean and palm). Three times used oil obtained. The transesterification process using KOH and NaOH at seven catalyst concentrations ranging from 0.2 to 1.2 %wt. Six reaction temperatures ranging from; 20 to 65 degrees C test periods ranging from 0.5 h to 8.0 h and six alcohol/oil ratios have been used. Methanol was the alcohol of choice. The effect of test temperatures, test periods, alcohol/oil molar ratio and catalytic concentrations on both biodiesel %wt. and viscosity carried out and investigated. Non-used com oil produces biodiesel with an efficiency reaching 98.5% followed by rapeseed, sunflower, soybean and palm respectively as compared to used oil that have 88% at catalytic concentration = 0.5, five h, alcohol/oil molar ratio 5:1, impeller speed 500 rpm and 60 degrees C. KOH is most effective than NaOH based catalysts.