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A Kinetic Study of CO2 and Steam Gasification of Char from Lignin Produced in the SEW Process
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
University of Borås.
Aalto University, Espoo.
Aalto University, Espoo.
2014 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 9, no 2, p. 3052-3063Article in journal (Refereed) Published
Abstract [en]

The reaction kinetics of gasification are important for the design of gasifiers using biomass feedstocks, such as lignin, produced in biorefinery processes. Condensed and uncondensed lignin samples used in the present study were prepared using the SEW (SO2-ethanol-water) fractionation process applied to spruce wood chips: the dissolved lignin is precipitated during the recovery of SO2 and ethanol from the spent fractionation liquor. The gasification of char made from condensed and uncondensed SEW lignin was investigated using thermogravimetric analysis (TGA) at atmospheric pressure using either CO2 or steam. The main aim of this study was to quantify the reaction rate during the gasification process, which was found to be best described as zero-order. All experiments were performed at constant temperatures between 700 and 1050 °C to obtain the necessary information for describing the reaction rate equation in an Arrhenius form; the heating rate was 20 °C/min for both samples. The experiments led to almost similar results for both samples. The activation energies of CO2 gasification were approximately 160 kJ/mol and 170 kJ/mol for uncondensed and condensed lignin char, respectively. The activation energies of steam gasification were approximately 90 kJ/mol and 100 kJ/mol for uncondensed and condensed lignin char, respectively.

Place, publisher, year, edition, pages
2014. Vol. 9, no 2, p. 3052-3063
National Category
Chemical Process Engineering
Research subject
Chemical Technology
Identifiers
URN: urn:nbn:se:ltu:diva-2686Local ID: 056f3866-293a-4a3c-84dc-0672cc764d6bOAI: oai:DiVA.org:ltu-2686DiVA, id: diva2:975539
Note
Validerad; 2014; 20141008 (amifar)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_09_2_3052_Farzaneh_Kinetic_Study_Steam_Gasification

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Farzaneh, Amirfarrokh

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