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The current research work investigated the suitability of utilizing Used Cooking Oil (UCO) as a substitute for diesel by using the microemulsification technique. A microemulsion-based biofuel system was formulated using UCO and carbinol as the continuous and dispersed phases, respectively. Winsor type IV stable microemulsion fuel was developed by adding Butan-2-ol as the co-surfactant. The formulated fuel samples were observed to be stable for 30 days. A Phase behavior study was conducted on the samples to analyze the system’s stability, and single-phase emulsions were identified. The particle size of the distributed alcohol phase in the identified system was explored using Dynamic Light Scattering (DLS) study and was found to be 14.6 nm. The results of this work showed the viscosity variation, droplet size distribution, and Proton Nuclear Magnetic Resonance ( 1 HNMR) spectrum of UCO and microemulsion fuel. The optimum blend exhibiting fuel properties under ASTM D6751 standards for biodiesel was 50% UCO, 25% Carbinol, and 25% Butan-2-ol by volume. It gave a kinematic viscosity of 5.74 cSt, a density of 0.862 gm/cm 3,  and a calorific value of 31.5 mJ/kg. This study recommends using UCO-carbinol-based microemulsion fuels as an effective and economical alternative for the biofuel industry.

Microemulsion fuel formulation from used cooking oil with carbinol as the dispersion phase