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Catalytic Upgrading of Fast Pyrolysis Bio-oil Using Zeolites
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Fast pyrolysis bio-oil is considered as a possible source for production of liquid bio-fuels and bio-chemicals enabling the necessary transition to a renewable energy system. In this Master’s thesis work the upgrading of fast pyrolysis bio-oils with Fluid Catalytic Cracking (FCC) conversion process at industrially relevant conditions is studied using Fluid Catalytic Cracking Micro Activity Test (FCC MAT) unit at RISE ETC in Piteå, Sweden. The study is focused on evaluating the process in terms of production of value-added products including petrochemical materials, such as propylene and benzene, toluene, xylene (BTX), and petroleum range liquid biofuels. The evaluation of the process was based on the upgraded products yield and quality characterized by the chemical composition of collected liquid and gas samples with regards to several influencing factors including origin of the bio-oil, addition of ZSM-5 zeolite to the commercial catalyst and FCC operation parameters, such as reaction temperature, catalyst to oil (CTO) ratio and ZSM5 zeolite catalysts acidity. Several analytical methods were applied for characterization of both feedstock and products, including GC MS analysis and determination of the boiling range distribution of the liquid products by simulated distillation. The results of this work showed that the process of upgrading pure pyrolysis bio-oil was challenging and required further studies to develop a practical operating process. While the process of co-feeding of the pyrolysis bio-oil with commercial FCC fossil feedstock was determined as feasible at industrially relevant conditions. Catalytic conversion of co-fed pyrolysis bio-oil at the ratio of 20/80 resulted similar petrochemical products to commercial fossil feedstock with full deoxygenation of pyrolysis bio-oil. Moreover, the results showed that high catalytic reaction activity conditions with high reaction temperature along with the use of ZSM-5 zeolite were favored for maximizing the BTX and gasoline range products.

Abstract [sv]

Snabb pyrolys bio-olja betraktas som en möjlig källa för produktion av flytande biobränslen och biokemikalier som möjliggör den nödvändiga övergången till ett förnybart energisystem. I detta examensarbete studeras uppgraderingen av snabba pyrolys bio-oljor med FCC MAT-enheten vid RISE ETC i Piteå, Sverige. Studien är inriktad på att utvärdera processen inom ramen för produktion av mervärdesprodukter inklusive petrokemiska material, såsom propen och bensen, toluen, xylen (BTX) och flytande biobränslen. Utvärderingen av processen baserades på det uppgraderade produktutbytet och kvaliteten som kännetecknades av den kemiska sammansättningen av uppsamlade vätske- och gasprover med avseende på flera påverkande faktorer inklusive bio-oljans ursprung, tillsättningen av ZSM-5 zeolit till den kommersiella katalysatorn och FCC-driftparametrar, såsom reaktionstemperatur, förhållandet katalysator till olja (CTO) och ZSM-5 zeolitkatalysatorers surhet. Flera analysmetoder användes för karaktärisering av både råmaterial och produkter, inklusive GC MS-analys och bestämning av kokpunkternas fördelning av de flytande produkterna genom simulerad destillation. Resultaten av detta arbete visade att processen för uppgradering av ren pyrolys bio-olja var utmanande och kräver ytterligare studier för att utveckla en praktisk driftsprocess. Medan processen för sam-matning av pyrolys bio-olja med kommersiell FCC-fossil råvara bestämdes vara genomförbar vid industriellt relevanta förhållanden. Katalytisk omvandling av sam-matad pyrolys bio-olja i förhållandet 20/80 resulterade i liknande petrokemiska produkter som kommersiellt fossilt råmaterial med full deoxygenering av pyrolys bio-oljan. Resultaten visade dessutom att förhållanden med hög katalytisk reaktionsaktivitet och hög reaktionstemperatur tillsammans med användning av ZSM-5-zeolit var gynnsamma för att maximera produktionen av mervärdesprodukter såsom BTX- och biobränslen.

Place, publisher, year, edition, pages
2019. , p. 47
Series
TRITA-ITM-EX ; 2019:398
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-255683OAI: oai:DiVA.org:kth-255683DiVA, id: diva2:1341208
Subject / course
Thermal Engineering
Educational program
Degree of Master
Presentation
2019-06-10, 00:00
Supervisors
Examiners
Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2019-08-08Bibliographically approved

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