Assessment of black liquor hydrothermal treatment under sub- and supercritical conditions: Products distribution and economic perspectives.

Autor: Barros TV; Department of Chemical Engineering, State University of Maringá (UEM), Maringá, PR, 87020-900, Brazil. Electronic address: thiago1390@gmail.com., Carregosa JDC; Petroleum and Energy from Biomass Research Group (PEB), Chemistry Department, Federal University of Sergipe (UFS), São Cristóvão, SE, 49100-000, Brazil. Electronic address: jhonattas.carregosa@live.com., Wisniewski A Jr; Petroleum and Energy from Biomass Research Group (PEB), Chemistry Department, Federal University of Sergipe (UFS), São Cristóvão, SE, 49100-000, Brazil. Electronic address: albertowj@ufs.br., Freitas ACD; Department of Chemical Engineering, Federal University of Maranhão (UFMA), São Luís, MA, 65080-805, Brazil. Electronic address: acd.freitas@ufma.br., Guirardello R; School of Chemical Engineering, State University of Campinas (UNICAMP), Campinas, SP, 13083-970, Brazil., Ferreira-Pinto L; Department of Energy Engineering, São Paulo State University (UNESP), Rosana, SP, 19273-000, Brazil. Electronic address: leandro.f.pinto@unesp.br., Bonfim-Rocha L; Department of Chemical Engineering, Technological Federal University of Paraná (UTFPR), Londrina, PR, 86036-370, Brazil. Electronic address: lucasrocha@utfpr.edu.br., Jegatheesan V; School of Engineering & Water: Effective Technologies and Tools (WETT) Research Centre, RMIT University, Melbourne, VIC, 3000, Australia. Electronic address: jega.jegatheesan@rmit.edu.au., Cardozo-Filho L; Department of Chemical Engineering, State University of Maringá (UEM), Maringá, PR, 87020-900, Brazil; Department of Agronomy, State University of Maringá (UEM), Maringá, PR, 87020-900, Brazil. Electronic address: lcfilho@uem.br.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2022 Jan; Vol. 286 (Pt 2), pp. 131774. Date of Electronic Publication: 2021 Aug 03.
DOI: 10.1016/j.chemosphere.2021.131774
Abstrakt: This study reports an alternative method for black liquor treatment with potential for energy and process savings in the paper and pulp industry. Gasification of black liquor was carried out under sub- and supercritical conditions, varying the black liquor feed composition (0.10, 2.55 and 5.00 wb%) and temperature (350, 425 and 500 °C). Liquid products were identified by high resolution mass spectrometry (FT-Orbitrap MS) and compounds belonging to classes O 3 and O 4 were found to be the most representative in the products of reactions performed at 500 °C. The mass spectra results also revealed the overall selectivity of reactions, where decarboxylation and demethoxylation reactions were favored under subcritical and supercritical conditions, respectively. Among the gaseous products, hydrogen and methane were produced with maximum of 69.04 and 28.75 mol%, respectively, at 2.55 wb% and 425 °C. The proposed thermodynamic modelling of the reaction system satisfactorily predicted the gas phase behavior of the system. In the economic analysis, the simulated conditions indicated that the main energy requirements for a scaled-up black liquor gasification process are related to the necessary heat exchangers and pressurizing of the black liquor solution. Furthermore, the cost of the black liquor gasification is around 0.06 US$ per kg of feed stream. Liquid and gaseous products from gasification could be obtained at a cost of 56.64 US$ and 3.35 US$ per tonne of stream, respectively. Therefore, black liquor gasification is an interesting route for obtaining combustible gases and value-added bioproducts.
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Databáze: MEDLINE
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