The Effect of Trans-esterification Process Using KOH Catalyst on the Characteristics of Biodiesel from Sterculia Foetida Seeds as Additional Fuel

Research on renewable fuel energy sources and the use of catalysts in increasing their production has always been an interesting topic this era towards industry 5.0. This is because world's needs are every year, especially during industrial revolution. It requires more other types to convert. Based that need, alternative abundant were needed. One form source biodiesel. Biodiesel environmentally friendly, clean, biodegradable, produces low exhaust emissions. raw materials for biodiesel can be obtained from Kepuh seeds (Sterculia foetida). The manufacture goes through five stages, namely pressing, degumming, esterification, transesterification, purification. Then, produced added bio solar a ratio 8:2 (biodiesel: solar). Additions made samples mixture based amount catalyst used (0.8; 0.9; 1.0; 1.1; 1.2%). results quality test, average value density test was 0.85 kg/m3, viscosity 3.24 CST calorific 11,090 cal/gram.