Abstract: Jatropha seed oil was used to produce biodiesel using a modified batch reactor. A two stage esterification process was adopted. A 114 liters cylindrical batch reactor was modified and locally fabricated, all the required reagents were also locally sourced. Sulphuric acid (H2SO4) to oil ratio of 1%w/w and methanol(CH3-OH) to oil ratio of 60%w/w ¬were used to ensure less than 4% free fatty acid (FFA) content. 753ml of alcohol (methanol) and 30grams of sodium hydroxide (NaOH) was vigorously mixed for about 35mins to achieve a homogenous solution. 3500ml of the acid treated Jatropha curcas seed oil was trans-esterified.