Membrane reactor is an alternative technology that is used in the manufacture of biodiesel, one of the advantages that the reaction and separation process takes place in a single stage simultaneous. This research aims to study the effect of the variation of the catalyst and mole ratio feed waste cooking oil- methanol in biodiesel production, transesterification process which was held in a membrane reactor with a variation of the mole ratio of waste cooking oil - methanol 1:12, 1:16, and 1:20, the concentration of the base catalyst 1% -wt, 1.5% -wt and 2% -wt, pressure transmembrane 2 bar and a temperature of 60 oC process. The results showed biodiesel production using membrane reactor reached 94.81% yield on the condition of the mole ratio of 1:16 with a concentration of 2 %-wt, characteristics of biodiesel produced meets the quality standards of biodiesel in Indonesia including biodiesel, densityis 850-873 kg/m3, viscosity cinematic of biodiesel 5.12-5.97 mm2/s, Flash Point 150-160 °C, Acid Number 0.55 to 0.64 mg-KOH/g.Keywords: biodiesel, waste cooking oil, membrane reactor, mol ratio, catalyst concentration.
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