Refining of used engine oil by solvent extraction and adsorption processes: A circular economy strategy. Indian Journal of Chemical Technology (IJCT), [S. l.], v. 32, n. 6, p. 755–765, 2025. DOI: 10.56042/ijct.v32i6.17045. Disponível em: https://or.niscpr.res.in/index.php/IJCT/article/view/17045. Acesso em: 10 jun. 2026.