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Pyrolysis of kraft pulp and black liquor precipitates derived from spruce: Thermal and kinetic analysis
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.ORCID iD: 0000-0002-2068-357X
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.ORCID iD: 0000-0001-7995-3151
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.ORCID iD: 0000-0002-8992-3623
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Wood Chemistry and Pulp Technology.ORCID iD: 0000-0002-0252-337X
2016 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 149, 275-284 p.Article in journal (Refereed) Published
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Text
Abstract [en]

The potential of seven kraft cook materials to become functional char materials and fuels is investigated. Thermogravimetric analysis was used to study the thermal properties while a model-free isoconversional method was used to derive kinetic rate expressions. Black liquor precipitates had lower thermal stability (20-60 K lower) than pulps and spruce wood and the precipitates decomposed in a wider temperature range, producing chars with similar or higher thermal stability than char from pulps, but lower than those from spruce wood. Samples suitable to produce char were identified based on char yield, devolatilization rate and charring temperature. The highest char yield (46%), achieved from a precipitate, was more than twice as high as that from spruce powder. Under the studied conditions none of the materials had a pyrolysis process that for the whole conversion range could be described with a single set of kinetic parameters. The apparent activation energy varied between 170-260 kJ/mol for the pulps and 50-650 kJ/mol for the precipitates. The derived kinetic parameters were validated by predicting the conversion at a heating rate outside the range used for its derivation and at quasi isothermal conditions. Both these tests gave satisfactory results in good agreement with experimental data.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 149, 275-284 p.
Keyword [en]
Kraft, Spruce, Pyrolysis, Kinetics, Isoconversional, Char
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-189789DOI: 10.1016/j.fuproc.2016.04.029ISI: 000378183100028Scopus ID: 2-s2.0-84965057211OAI: oai:DiVA.org:kth-189789DiVA: diva2:949573
Funder
Swedish Energy Agency
Note

QC 20160721

Available from: 2016-07-21 Created: 2016-07-15 Last updated: 2016-11-29Bibliographically approved

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Samuelsson, Lina N.Bäbler, Matthäus U.Brännvall, ElisabetMoriana, Rosana
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