Search Results (2)

Currently, there exists a significant need for alternate sources of petroleum fuel due to escalating environmental challenges and diminishing global oil reserves. Biodiesel, an environmentally friendly and sustainable fuel, is one of the most adaptable alternatives to petroleum fuel. This study’s goals were to get biodiesel from three oils (olive, palm, and jojoba) and see how well lipases work as biocatalysts for the esterification process. The production of biodiesel was obtained from two fungal strains, Aspergillus niger MH079049.1 and A. niger MH078571.1, and four distinct fatty acids and four organic solvents were used. The study determined the optimal reaction conditions to be a reaction time of 24 h, an enzyme concentration of 3 mL, and an oil-to-methanol ratio of 3:1. This study showed that lipase works well in making biodiesel, with an impressive esterification yield of 99%, and the highest level of productivity was attained when olive oil and jojoba oils were subjected to an incubation time of 18 h and 22 h, respectively, in the presence of palm oil. Full article

Over many decades, isolated regions (e.g., islands, rural and remote areas) have heavily relied on diesel engine for producing power and energy. However, due to depleting fossil fuels and concerning emissions, biodiesels could be the substitute for diesel in power generation sectors. This study developed a single-zone thermodynamic model to predict the engine performances such as brake power (BP), torque, brake thermal efficiency (BTE), brake-specific fuel consumption (BSFC) and ignition delay (ID) times for diesel and jojoba biodiesel. The experiments were conducted on a fully automated, 4-cylinder, 4-stroke, liquid-cooled direct injection 3.7-L diesel engine fueled with diesel (D100) and three jojoba blends (JB5, JB10, and JB20) to validate the model. The performance simulation results agreed with experimental data for all tested fuels at 1200 to 2400 rpm speed and 25%, 50%, 75%, and 100% loading operation. The minimum error (3.7%) was observed for BP for D100 at 2000 rpm and 100% load, and the maximum error (19.2%) was found for JB10 at 1200 rpm and 25% loading operation. As load increases from 25 to 100%, the BSFC and torque difference between diesel and JB20 decreases from 10 to 6.5 and 9 to 6%, respectively. A shorter ID time was observed in JB5 compared to JB10 and JB20. Furthermore, a significant reduction was observed in CO (7.55%) and HC (6.65%) emission for JB20 at 25% and 1200 rpm compared to diesel fuel; however, NOx emission was increased up to 10.25% under any given conditions. Full article