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Valorisation of Leather Wastes from the Footwear Industry via Pyrolysis: Product Yields and Characterisation

2023-05-10Conference paper Open access
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datacite.subject.fosEngenharia e Tecnologia
datacite.subject.sdg09:Indústria, Inovação e Infraestruturas
dc.contributor.authorSilva, F.
dc.contributor.authorDireito, D.
dc.contributor.authorPilão, R.
dc.contributor.authorRibeiro, A.M.
dc.contributor.authorSilva, Felipe
dc.contributor.authorDireito, Daniel
dc.contributor.authorPilão, Rosa Maria
dc.contributor.authorRibeiro, Albina
dc.date.accessioned2025-02-18T17:56:00Z
dc.date.available2025-02-18T17:56:00Z
dc.date.issued2023-05-10
dc.description.abstractThe footwear industry, although contributing positively to the Portuguese economy, generates a lot of residues including chromium tanned leather wastes. This study presents results on the slow pyrolysis of these residues at particle sizes between 5 and 6.3 mm and temperatures inside the reactor ranging from 444 to 875 °C. For this range of temperatures, char yield decreased from 36.2 to 28.1% and gas yield increased between 33.2 and 47.6%. The liquid phase yield was highest at 444 °C (30.6%) and then decreased to 24.3% at 875 °C. As the operating temperature increased, there was an increase in the ash content (15.8 to 21.6%) and a decrease in volatiles content (20.9–3.7%) of biochars. The higher heating values (HHV) of the chars were between 21.9 and 23.1 MJ/kg. Preliminary results show that an increase in particle size leads to a rise in char yield. The infrared analysis of the liquid phase indicated the presence of water, alcohols, phenols, carboxylic acids, alkanes, alkenes, and aromatics. The liquid phases had an average water content of 43%, densities between 1110 and 1120 kg/m3 and the HHV between 12.7 and 15.1 MJ/kg. The gases produced were analysed by gas chromatography. For 538 °C, the production of H2, CO, CH4 and CO2 was, respectively, 1.00, 0.37, 0.18 and 1.37 mol/kg of leather. At 875 °C, H2 was the most produced gas (2.74 mol/kg leather), followed by CO, CO2 and CH4 with quantities of 1.40, 1.26 and 0.42 mol/kg leather.eng
dc.description.sponsorshipThis work was supported by Fundação para a Ciência e Tecnologia—SFRH/BD/137913/2018.
dc.identifier.citationSilva, F., Direito, D., Pilão, R., Ribeiro, A.M. (2024). Valorisation of Leather Wastes from the Footwear Industry via Pyrolysis: Product Yields and Characterisation. In: Galvão, J.R.d.C.S., Brito, P., Neves, F.d.S., Almeida, H.d.A., Mourato, S.d.J.M., Nobre, C. (eds) Proceedings of the 3rd International Conference on Water Energy Food and Sustainability (ICoWEFS 2023). ICoWEFS 2023. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-031-48532-9_19
dc.identifier.doi10.1007/978-3-031-48532-9_19
dc.identifier.isbn978-3-031-48532-9
dc.identifier.urihttp://hdl.handle.net/10400.22/29585
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSpringer
dc.relation.hasversionhttps://link.springer.com/chapter/10.1007/978-3-031-48532-9_19
dc.rights.uriN/A
dc.subjectChromium tanned leather wastes
dc.subjectPyrolysis
dc.subjectBiochar
dc.subjectBio-oil
dc.titleValorisation of Leather Wastes from the Footwear Industry via Pyrolysis: Product Yields and Characterisationeng
dc.typeconference paper
dspace.entity.typePublication
oaire.citation.conferenceDate2023-05-23
oaire.citation.conferencePlaceLeiria, Portugal
oaire.citation.endPage213
oaire.citation.startPage203
oaire.citation.titleInternational Conference on Water Energy Food and Sustainability (ICoWEFS 2023)
oaire.versionhttp://purl.org/coar/version/c_ab4af688f83e57aa
person.familyNameSilva
person.familyNameDireito
person.familyNamePilão
person.familyNameRibeiro
person.givenNameFelipe
person.givenNameDaniel
person.givenNameRosa Maria
person.givenNameAlbina
person.identifier.ciencia-id5E11-8787-9A50
person.identifier.ciencia-id321F-B830-CA06
person.identifier.ciencia-id171A-6098-4B85
person.identifier.orcid0000-0003-4855-6932
person.identifier.orcid0000-0001-7715-8576
person.identifier.orcid0000-0003-3443-1784
person.identifier.orcid0000-0003-4855-6932
person.identifier.orcid0000-0002-9361-4612
person.identifier.orcid0000-0001-7715-8576
person.identifier.orcid0000-0003-3443-1784
person.identifier.scopus-author-id6506645717
person.identifier.scopus-author-id55550816700
relation.isAuthorOfPublication19fe88a1-224b-491e-a649-48e79aa40754
relation.isAuthorOfPublicationc3ea9420-c5a6-4416-bf5f-47665a3ca10f
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relation.isAuthorOfPublication2d144222-ce1a-4b22-9ddd-2b6615537376
relation.isAuthorOfPublication.latestForDiscovery19fe88a1-224b-491e-a649-48e79aa40754

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