Calorific Power Improvement of Wood by Heat Treatment and Its Relation to Chemical Composition
Chemical composition influences the calorific power of wood, mainly due to the calorific power of structural compounds and extractives. Heat treatment changes the chemical composition of treated wood. This work studies the relationship between chemical composition and calorific power improvement by...
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| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/20/5322 |
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| author | Idalina Domingos Umit Ayata José Ferreira Luisa Cruz-Lopes Ali Sen Sirri Sahin Bruno Esteves |
| author_facet | Idalina Domingos Umit Ayata José Ferreira Luisa Cruz-Lopes Ali Sen Sirri Sahin Bruno Esteves |
| author_sort | Idalina Domingos |
| collection | DOAJ |
| description | Chemical composition influences the calorific power of wood, mainly due to the calorific power of structural compounds and extractives. Heat treatment changes the chemical composition of treated wood. This work studies the relationship between chemical composition and calorific power improvement by heat treatment. Samples were heat-treated by the ThermoWood process <sup>®</sup> for 1 h and 2 h. High heating value (HHV) and chemical composition; lignin, cellulose, hemicelluloses and extractives in dichloromethane, ethanol, and water were determined. The HHV of untreated wood ranged between 18.54–19.92 MJ/kg and increased with heat treatment for all the tested species. A positive linear correlation was found between HHV and Klason lignin (R<sup>2</sup> = 0.60). A negative trend was observed for holocellulose, cellulose, and hemicelluloses content against HHV, but with low determination coefficients for linear regression. The best adjust for polysaccharides was found for hemicelluloses content. A positive correlation could be found for dichloromethane extractives (R<sup>2</sup> = 0.04). The same was obtained in relation to ethanol extractives with R<sup>2</sup> = 0.20. For water and total extractives, no clear positive or negative trends could be achieved. The results showed that the HHV of wood increased with heat treatment and that this increase was mainly due to the increase in lignin content. |
| first_indexed | 2024-03-10T15:40:54Z |
| format | Article |
| id | doaj.art-de02aa549868450dad81c44012b3f29e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T15:40:54Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-de02aa549868450dad81c44012b3f29e2023-11-20T16:53:57ZengMDPI AGEnergies1996-10732020-10-011320532210.3390/en13205322Calorific Power Improvement of Wood by Heat Treatment and Its Relation to Chemical CompositionIdalina Domingos0Umit Ayata1José Ferreira2Luisa Cruz-Lopes3Ali Sen4Sirri Sahin5Bruno Esteves6Department of Wood Engineering and CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, PortugalDepartment of Interior Architecture and Environmental Design, Faculty of Arts and Design, Bayburt University, Bayburt 69000, TurkeyDepartment of Wood Engineering and CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, PortugalDepartment of Environmental Engineering and CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, PortugalSchool of Agriculture, Forest Research Centre, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, PortugalDepartment of Agricultural Buildings and Irrigation, Agriculture Faculty, Ataturk University, Erzurum 25240, TurkeyDepartment of Wood Engineering and CERNAS-IPV Research Centre, Polytechnic Institute of Viseu, 3504-510 Viseu, PortugalChemical composition influences the calorific power of wood, mainly due to the calorific power of structural compounds and extractives. Heat treatment changes the chemical composition of treated wood. This work studies the relationship between chemical composition and calorific power improvement by heat treatment. Samples were heat-treated by the ThermoWood process <sup>®</sup> for 1 h and 2 h. High heating value (HHV) and chemical composition; lignin, cellulose, hemicelluloses and extractives in dichloromethane, ethanol, and water were determined. The HHV of untreated wood ranged between 18.54–19.92 MJ/kg and increased with heat treatment for all the tested species. A positive linear correlation was found between HHV and Klason lignin (R<sup>2</sup> = 0.60). A negative trend was observed for holocellulose, cellulose, and hemicelluloses content against HHV, but with low determination coefficients for linear regression. The best adjust for polysaccharides was found for hemicelluloses content. A positive correlation could be found for dichloromethane extractives (R<sup>2</sup> = 0.04). The same was obtained in relation to ethanol extractives with R<sup>2</sup> = 0.20. For water and total extractives, no clear positive or negative trends could be achieved. The results showed that the HHV of wood increased with heat treatment and that this increase was mainly due to the increase in lignin content.https://www.mdpi.com/1996-1073/13/20/5322calorific powerchemical compositioncorrelationsheat treatment |
| spellingShingle | Idalina Domingos Umit Ayata José Ferreira Luisa Cruz-Lopes Ali Sen Sirri Sahin Bruno Esteves Calorific Power Improvement of Wood by Heat Treatment and Its Relation to Chemical Composition Energies calorific power chemical composition correlations heat treatment |
| title | Calorific Power Improvement of Wood by Heat Treatment and Its Relation to Chemical Composition |
| title_full | Calorific Power Improvement of Wood by Heat Treatment and Its Relation to Chemical Composition |
| title_fullStr | Calorific Power Improvement of Wood by Heat Treatment and Its Relation to Chemical Composition |
| title_full_unstemmed | Calorific Power Improvement of Wood by Heat Treatment and Its Relation to Chemical Composition |
| title_short | Calorific Power Improvement of Wood by Heat Treatment and Its Relation to Chemical Composition |
| title_sort | calorific power improvement of wood by heat treatment and its relation to chemical composition |
| topic | calorific power chemical composition correlations heat treatment |
| url | https://www.mdpi.com/1996-1073/13/20/5322 |
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