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Production of biodiesel from waste cooking oils and its purification using adsorption techniques with natural adsorbents

2023Documento de conferência Acesso aberto
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datacite.subject.fosEngenharia e Tecnologia::Engenharia Química
datacite.subject.sdg09:Indústria, Inovação e Infraestruturas
dc.contributor.authorFabian, João Vitor
dc.contributor.authorGuimarães, Miriam D.
dc.contributor.authorSmolich, Camilla Groxko
dc.contributor.authorPokriwiecki, Ticiane S.
dc.contributor.authorQueiroz, Ana
dc.contributor.authorRibeiro, António E.
dc.contributor.authorBrito, Paulo
dc.date.accessioned2026-03-23T10:48:26Z
dc.date.available2026-03-23T10:48:26Z
dc.date.issued2023
dc.description.abstractThe world's energy demands are steadily increasing each year, promoting the exploration of cleaner and more sustainable alternatives to classical fossil sources. In this context, biodiesel emerges as a promising candidate for replacing fossil diesel, making a significant contribution to carbon emissions reduction. One notable advantage lies in the ability to utilize waste cooking oils (WCO) as a feedstock for biodiesel production. This practice not only mitigates waste but also transforms a previously underutilized resource into a valuable source of renewable energy, thereby promoting sustainability and energy efficiency. Currently, 95% of biodiesel production relies on first-hand feedstock due to its high conversion into fatty acid ethyl esters (FAEEs) or fatty acid methyl esters (FAMEs) . However, this study introduces the utilization of Waste Cooking Oil (WCO) as a greener approach to biodiesel production. Biodiesel production can be achieved through alkaline catalyzed transesterification, with the aim of meeting the standards specified by EN 14214 at the end of its production process. Therefore, crude biodiesel obtained from the transesterification step needs to undergo glycerol purification in order to comply with the norm specification of a maximum free glycerin content of 0.02% (w/w). Hence, the present study seeks to produce and characterize activated carbons derived from walnut shells, and evaluate its use in the removal of glycerol from crude ethanolic biodiesel produced from WCO, a possible alternative to the traditional wet washing process, which results in the loss of between 0.2L to 10L of water per liter of biodiesel produced . In this work, titration in triplicate was employed to determine the acid value of the oil, quantified as mg KOH/g of the sample, yielding a result of 0.8355±0.0274. This provided a preliminary assessment for the determination of the necessary alkaline catalyst percentage which would mitigate parallel saponification during the transesterification process. The reaction tests, executed in duplicate, included varying catalyst proportions of 0.5%, 0.6%, and 0.7% (w/w) relative to the processed oil. Gas chromatography (GC) was employed for the characterization of the produced biodiesel, revealing that a 0.5% (w/w) catalyst load was the optimal choice, providing a consistent average yield of 89.52% in FAEEs. Biodiesel production is currently conducted via the ethanol route with 1:7.5 oil/ethanol molar ratio, considering an excess in relation to the stoichiometric molar ratio 1:3. The research is also focused on the production of activated carbon materials, involving both chemical and physical activation techniques. Chemical activations will encompass the utilization of bases (KOH), acids (H3PO4), constituting a pivotal phase in enhancing the overall efficiency and sustainability of the biodiesel production process.eng
dc.description.sponsorshipThe authors are grateful to the Foundation for Science and Technology (FCT, Portugal) for financial support through national funds FCT/MCTES (PIDDAC) to CIMO (UIDB/00690/2020 and UIDP/00690/2020) and SusTEC(LA/P/0007/2021).
dc.identifier.citationFabian, João Vitor; Guimarães, Miriam D.; Smolich, Camilla Groxko; Pokriwiecki, Ticiane S.; Queiroz, Ana; Ribeiro, António E.; Brito, Paulo (2023). Production of biodiesel from waste cooking oils and its purification using adsorption techniques with natural adsorbents. In XXVII Encontro Luso Galego de Química. Porto. ISBN 978-989-8124-40-1
dc.identifier.isbn978-989-8124-40-1
dc.identifier.urihttp://hdl.handle.net/10198/36210
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSociedade Portuguesa de Química
dc.relationMountain Research Center
dc.relationMountain Research Center
dc.relationAssociate Laboratory for Sustainability and Tecnology in Mountain Regions
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectBiodiesel
dc.subjectWaste cooking oils
dc.titleProduction of biodiesel from waste cooking oils and its purification using adsorption techniques with natural adsorbentseng
dc.typeconference object
dspace.entity.typePublication
oaire.awardNumberUIDB/00690/2020
oaire.awardNumberUIDP/00690/2020
oaire.awardTitleMountain Research Center
oaire.awardTitleMountain Research Center
oaire.awardTitleAssociate Laboratory for Sustainability and Tecnology in Mountain Regions
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00690%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00690%2F2020/PT
oaire.awardURIhttp://hdl.handle.net/10198/35997
oaire.citation.conferenceDate2023
oaire.citation.conferencePlacePorto
oaire.citation.endPage378
oaire.citation.startPage378
oaire.citation.titleXXVII Encontro Luso Galego de Química
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameQueiroz
person.familyNameRibeiro
person.familyNameBrito
person.givenNameAna
person.givenNameAntónio E.
person.givenNamePaulo
person.identifier.ciencia-id2611-D40C-3472
person.identifier.ciencia-id3211-D5B0-870D
person.identifier.ciencia-idA31A-D845-A6E2
person.identifier.orcid0000-0003-4761-0618
person.identifier.orcid0000-0003-4569-7887
person.identifier.orcid0000-0003-1805-0252
person.identifier.ridO-8367-2015
person.identifier.scopus-author-id23390701300
person.identifier.scopus-author-id31168231800
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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