Optimization of Microwave-Assisted Extraction of Residual Soybean Oil from Spent Bleaching EarthChanatip Dejkajorn, Panawan Suttiarporn, Hussanai Sukkathanyawat, Kittisak Wichianwat, Saichon Sriphan and Thanarak SrisuratE3S Web Conf., 302 (2021) 01009DOI: https://doi.org/10.1051/e3sconf/202130201009