Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/3082
Título: Co-liquefaction of wastes and coal mixtures to produce added value liquid compounds
Autor: Pinto, Filomena
Costa, Paula
Paradela, Filipe
Silva, Pedro
Meredith, Will
Stevens, Lee
Snape, Colin
Palavras-chave: Thermochemical processes
Liquefaction
Energetic valorisation
Waste valorization
Coal mixtures
Polyethylene
Plastics
Data: 2018
Editora: AIDIC - The Italian Association of Chemical Engineering
Citação: Pinto, F.; Costa, P.; Paradela, F... [et.al.]. - Co-liquefaction of wastes and coal mixtures to produce added value liquid compounds. In: Chemical Engineering Transactions, 2018, Vol. 65, p. 493-498
Resumo: ABSTRACT: Nowadays there is an increasing need to find alternative fuels to reduce the dependency on imported ones and to decrease the negative environmental impact of wastes accumulation. Plastics are an important components of urban biowaste, thus their conversion into liquid fuels, in mixtures with other solid fuels still remains an important research goal. After the large experience obtained from coal gasification, it was found that co-liquefaction of coal and wastes may be a good solution to produce liquid fuels and raw materials for several industries. Co-liquefaction of coal blended with biomass gave unfavourable results, but co-liquefaction of coal mixed with PE (polyethylene) wastes led to encouraging results. The results obtained showed that the rise of PE content in coal blends led to an increase in liquid yield. As the main objective was the formation of liquid products, the mixture of coal with 50 wt% of PE was selected, as substantial total liquid yields were obtained, while using significant coal content. This blend was used to study the effect of initial hydrogen pressure, reaction temperature and time on products yields, using Response Surface Methodology (RSM) approach. Liquid yields were most affected by reaction temperature and pressure. The rise of temperature decreased liquid yields, while pressure had a positive effect, but the interaction between these two parameters showed a negative influence. Theoretical equations were used to calculate total and direct liquids yield (%daf). Total liquids are the sum of the liquids directly recovered from the autoclave (direct liquids) and the liquids extracted from the solid product. Both the theoretical model and the experimental results showed that the highest total liquids yields were obtained at 380 ºC, 1.4 MPa and 90 minutes.
Peer review: yes
URI: http://hdl.handle.net/10400.9/3082
DOI: 10.3303/CET1865083
ISSN: 2283-9216
Aparece nas colecções:UB - Artigos em revistas internacionais

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