Optimization of Methyl Ester Through Simultaneous Esterification –Transesterification Reactions Using Waste Cooking Oil as Raw MaterialDella Orchidia, Galuh Widiyarti, Firman Tri Ajie, Faisal Prasetya Pangestu, Mauludin Hidayat, Dadi Ramdani, Yan Irawan and Joddy Arya LaksmonoE3S Web Conf., 503 (2024) 04010DOI: https://doi.org/10.1051/e3sconf/202450304010