000150716 001__ 150716
000150716 005__ 20251017144642.0
000150716 0247_ $$2doi$$a10.1016/j.jaap.2025.106984
000150716 0248_ $$2sideral$$a142873
000150716 037__ $$aART-2025-142873
000150716 041__ $$aeng
000150716 100__ $$aFresneda-Cruz, Alejandro
000150716 245__ $$aMicrowave-assisted pyrolysis of waste LDPE: Unveiling the role of induced gas-solid thermal gradients on pyrolysis oil product distribution
000150716 260__ $$c2025
000150716 5060_ $$aAccess copy available to the general public$$fUnrestricted
000150716 5203_ $$aMicrowave-assisted heating plays an important role in minimizing the high energy consumption of traditional thermochemical recycling processes. Its application to plastic waste recycling routes enables a more efficient production of new renewable feedstocks for the petrochemical industry. This work presents the experimental assessment of low-density polyethylene (LDPE) waste recycling in a microwave-assisted pyrolysis (MAP) fixed bed reactor and the in-depth evaluation of the obtained pyrolysis oils in comparison with conventional plastic waste pyrolysis oils. The role of main process variables (temperature, nitrogen flow rate and susceptor-to-LDPE ratio) on the pyrolysis oil yield and composition was addressed. The maximum attained oil and wax yields were of 60–75 wt%. As a general trend, the microwave-assisted process led to a distinct chemo-selectivity compared to that of traditional LDPE pyrolysis, shifting the products distribution from saturated paraffins to olefinic species and longer molecular chains. Olefins content rose from 28 % under conventional pyrolysis to 75 % under MAP. The negligible content of aromatic compounds in MAP oils offers great potential to serve as a recycled feedstock for steam crackers. These findings are ascribed to gas-phase reactions quenching due to the microwave-induced thermal gradient between the selectively heated bed and the comparatively colder surrounding atmosphere. A statistical parametric analysis and regression model have been implemented to further evaluate the impact of each variable, and mechanistic considerations were considered on the experimental microwave-induced thermal gradients and fixed bed mass and heat transfer properties. By integrating real polyolefin waste streams as feedstocks for chemical building blocks through microwave-assisted pyrolysis, this study helps paving the way for a transition to circularity in petrochemical industries.
000150716 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
000150716 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000150716 700__ $$aMurillo-Ciordia, Gonzalo
000150716 700__ $$aFigueirêdo, Monique B.
000150716 700__ $$aTovar-Lasheras, Fabiola
000150716 700__ $$aAL Farra, Ahmad
000150716 700__ $$0(orcid)0000-0002-5959-3168$$aArauzo, Jesús$$uUniversidad de Zaragoza
000150716 700__ $$aJulian, Ignacio
000150716 7102_ $$15005$$2555$$aUniversidad de Zaragoza$$bDpto. Ing.Quím.Tecnol.Med.Amb.$$cÁrea Ingeniería Química
000150716 773__ $$g187 (2025), 106984 [16 pp.]$$pJ. anal. appl. pyrolysis$$tJOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS$$x0165-2370
000150716 8564_ $$s9868206$$uhttps://zaguan.unizar.es/record/150716/files/texto_completo.pdf$$yVersión publicada
000150716 8564_ $$s2665209$$uhttps://zaguan.unizar.es/record/150716/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000150716 909CO $$ooai:zaguan.unizar.es:150716$$particulos$$pdriver
000150716 951__ $$a2025-10-17-14:32:28
000150716 980__ $$aARTICLE