Santos, Joselisse Soares de CarvalhoOliveira, Samuel Alves deCosta, Semuel Ebenézer DantasSilva, Rita de Cássia Andrade daCorcino, Marta AraujoLima, Luiz Ferreira deNeto, Eduardo Lins de Barros2021-11-182021-11-182019-04SANTOS, J. S. C.; OLIVEIRA, S. A.; COSTA, S. E. D.; SILVA, R. C. A.; CORCINO, M. A.; LIMA, L. F.; BARROS NETO, E. L.. Synthesis of biodiesel from soybean oil through alkaline transesterification. Brazilian Journal of Development, v. 5, p. 2822-2834, 2019. Disponível em: https://www.brazilianjournals.com/index.php/BRJD/article/view/1385. Acesso em: 21 jun. 2021. ttps://doi.org/10.34117/bjdv5n4-1385.2525-8761https://repositorio.ufrn.br/handle/123456789/44943The environmental impacts resulting from the use of fossil fuels, has intensified the need to develop renewable energy sources. Biodiesel is a fuel alternative to the fossil fuels and can be defined as a renewable fuel normally produced from the transesterification of vegetable oils. It has been used to diminish the environmental problems, such as global warming. This work consists in the production of biodiesel using as main raw material the soybean oil, through alkaline transesterification, followed by some physical-chemical characteristics: pH, density, corrosion rate. The results after pre-washing the oil resulted in better quality biodiesel. This being confirmed by the characterization tests, with a pH of 7,5, density of 871,2 kg/m³ and corrosion factor 1b, these data present values close to or within the parameters of ANPAttribution 3.0 Brazilhttp://creativecommons.org/licenses/by/3.0/br/BiodieselTransesterificação alcalinaFator de corrosãoarticle10.34117/bjdv5n4-1385