87849 20201105113547.0 doi 10.2495/ESUS190091 sideral 116226 ART-2019-116226 eng Palomo de la Fuente, José Fernando Production of antioxidants for biodiesel from straw black liquor depolymerization 2019 Access copy available to the general public Unrestricted Black liquor produced from semichemical pulping of barley straw has been depolymerized at different temperatures (250 to 325 ºC), time (1 to 3 h) and initial solids content in the black liquor (7 to 14 %). The obtained degraded and soluble lignin was then used as biodiesel stabilizer (against oxidation). The depolymerization products have been analyzed by gel permeation chromatography, gas chromatography-mass spectrometry (GC-MS), Fourier-transform infrared spectroscopy (FTIR) and phenolic content was quantified by using the Folin-Ciocalteu method. Regarding the molecular weight distribution, temperature and time have been the most influential factors, especially temperature that decreased the observed molecular weight. The presence of volatile phenolic compounds has been determined by GC-MS. Temperature was found to be the most influential factor: the higher the temperature the lower concentration of volatile phenolics. Regarding the FTIR, the measured spectra hardly change when modifying the experimental conditions. Oxidation stability of biodiesel increased with the reaction temperature applied to black liquor, suggesting that the increase of oxidation stability is not only caused by the volatile phenolic compounds. info:eu-repo/grantAgreement/ES/DGA-FEDER/T22-17R info:eu-repo/grantAgreement/ES/MINECO/ENE2017-85040-R info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 0.142 2019 Environmental Science (miscellaneous) 2019 Q4 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-1401-7511 Molés Algarra, Samuel Universidad de Zaragoza (orcid)0000-0002-6607-1309 Salafranca Lázaro, Jesús Universidad de Zaragoza (orcid)0000-0002-8704-9274 Gil Lalaguna, Noemí Universidad de Zaragoza (orcid)0000-0001-8960-2689 Gonzalo Callejo, Alberto Universidad de Zaragoza (orcid)0000-0002-9705-2207 Sánchez Cebrián, José Luis Universidad de Zaragoza 2009 750 Universidad de Zaragoza Dpto. Química Analítica Área Química Analítica 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 237, E&SVIII (2019), 97-108 WIT trans. ecol. environ. WIT Transactions on Ecology and the Environment 1746-448X 714082 http://zaguan.unizar.es/record/87849/files/texto_completo.pdf Versión publicada 458109 http://zaguan.unizar.es/record/87849/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:87849 articulos driver 2020-11-05-11:31:37 ARTICLE