000170060 001__ 170060
000170060 005__ 20260316092630.0
000170060 0247_ $$2doi$$a10.1016/j.colsurfa.2026.139868
000170060 0248_ $$2sideral$$a148506
000170060 037__ $$aART-2026-148506
000170060 041__ $$aeng
000170060 100__ $$aCiuffi, Benedetta
000170060 245__ $$aPhysicochemical characterization of hydrochar from polyurethane foam waste: Assessing the role of processing parameters
000170060 260__ $$c2026
000170060 5060_ $$aAccess copy available to the general public$$fUnrestricted
000170060 5203_ $$aPolyurethane foams are widely used polymers. Their end-of-life is largely managed through landfilling and incineration, causing environmental concerns and resource loss. Hydrothermal carbonization and hydrothermal liquefaction have recently emerged as promising thermochemical approaches to valorise polyurethanes waste into value added products. This study presents a systematic investigation of the effects of operating parameters on hydrochars (HCs) yields and properties, using a rigid polyurethane foam as feedstock. Product yields were rationalized using the Severity Value (SV) parameter and the obtained HCs were characterized by ultimate analysis, FTIR, SEM and thermogravimetric analysis. An increase in SV led to a reduction of HCs yields, whereas the effect of the feedstock to solvent ratio exhibited only a minor influence. Ultimate analysis revealed decreased H/C and O/C ratios in all HCs, while the nitrogen content increased in all samples compared to PUR, suggesting their potential application as nitrogen-doped carbon materials. All produced HCs exhibited HHVs higher than that of PUR (27.59 MJ/kg), indicating energy densification. The calculated combustion parameters indicated
that HCs exhibit lower reactivity and a slower, more controlled combustion process compared to PUR. These results together with their positioning in the coal-like regions of the Van Krevelen diagram, suggest their potential use as solid fuels. The liquid phases recovered for each test were rich in value-added compounds, including aromatic heterocycles. Overall, these findings offer valuable insights for advancing circular economy strategies in PUR waste management, highlighting the potential of HTC and HTL to simultaneously produce energy-dense solid fuels and value-added platform chemicals.
000170060 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000170060 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000170060 700__ $$aCipriani, Edoardo
000170060 700__ $$aFratini, Emiliano
000170060 700__ $$0(orcid)0000-0002-5959-3168$$aArauzo, Jesús$$uUniversidad de Zaragoza
000170060 700__ $$aRosi, Luca
000170060 7102_ $$15005$$2555$$aUniversidad de Zaragoza$$bDpto. Ing.Quím.Tecnol.Med.Amb.$$cÁrea Ingeniería Química
000170060 773__ $$g737 (2026), 139868 [14 pp.]$$pColloids surf., A Physicochem. eng. asp.$$tColloids and Surfaces A: Physicochemical and Engineering Aspects$$x0927-7757
000170060 8564_ $$s9028313$$uhttps://zaguan.unizar.es/record/170060/files/texto_completo.pdf$$yVersión publicada
000170060 8564_ $$s2188312$$uhttps://zaguan.unizar.es/record/170060/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000170060 909CO $$ooai:zaguan.unizar.es:170060$$particulos$$pdriver
000170060 951__ $$a2026-03-16-08:17:52
000170060 980__ $$aARTICLE