PRODUCTION OF BIOETHANOL FROM STAR APPLE (Chrysophyllum cainito) PULP BY YEAST FERMENTATION AND DISTILLATION

The purpose of this study is to produce bioethanol from star apple (Clnysoplzyllum cainito) pulp by yeast fermentation and distillation. Specifically, this study aims to determine the mass, volume, density, flammability, specific gravity, color and percent of ethanol extracted from star apple pulp. There are three treatments and each treatment has three replications. The mixture consist of 250 g of blended star apple pulp, 250 g (250 mL) of distilled water and 10 g of yeast which serves as the catalyst that converts sugar into ethanol and carbon dioxide. The mixture volume was held constant at 500 mL per bottle. The solution was fermented for two (2), three (3), and four (4) weeks. The data on volume, specific gravity, density, mass, percent of ethanol, ethanol volume and flammability were gathered. It was observed that as the specific gravity increases or gets closer to 1, the percent ethanol content decreases. On the other hand, the collected mean distillate increases with the length of fermentation. The trend for the corrected mean percent ethanol was increasing as the fermentation increases. Using one-way analysis of variance on a Complete Randomized Design, it was found out that there is significant difference at 5% level of significance on mass, volume, density, corrected specific gravity and corrected percent ethanol. In the flammability testing, it was observed that the flame produced by the distillates was pale blue and sometimes it has a red-orange."