English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/184864
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Evaluation of hydrochars from lignin hydrous pyrolysis to produce biocokes after carbonization

AuthorsCastro-Díaz, M.; Uguna, C.N.; Florentino Madiedo, Laura ; Díaz-Faes González, Elvira ; Stevens, L.A.; Barriocanal Rueda, Carmen ; Snape, C.E.
KeywordsLignin
Torrefaction
Hydrous pyrolysis
Biocoke
Carbonization
Issue Date19-Nov-2016
PublisherElsevier
CitationJournal of Analytical and Applied Pyrolysis 124: 742-751 (2017)
AbstractHydrochars were obtained after hydrous pyrolysis of a pine Kraft lignin using different reaction conditions (temperature, water content and residence time) and the residues were characterized through a wide range of analytical techniques including high-temperature rheometry, solid-state 13C nuclear magnetic resonance (NMR), thermal gravimetric analysis (TGA), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and field emission scanning electron microscopy (FE-SEM). The results indicated that an increase in reaction temperature, an increase in residence time or a decrease in water content reduces the amount of fluid material in the residue. The hydrous pyrolysis conditions studied were not able to increase the maturation of lignin, which would result in an increase in the resolidification temperature, but reduced the amount of mineral matter in the hydrochar produced. On the other hand, the hydrochars obtained from pristine lignin, torrefied lignin (300 °C, 1 h) and their 50:50 wt.%/wt.% blend at temperatures of 350 °C after 6 h using 30 ml of water had lower ash contents (<2 wt.%) than the parent lignin (2.5 wt.%) and a high rank good coking coal (10 wt.%). However, the reactivity of the resulting biocokes (>45%) is excessively high compared to that of the good coking coal (10%) and the micro-strength of the biocokes (R1<1%) is much lower than that of the coal (R1 = 17%). These findings could be rationalized by the high total porosity (>39%) and high microporous surface areas ( > 400 m2/g) of the biocokes and high alkalinity index of the lignins (>27%) compared to those of the coke (27% and 145 m2/g) and coal (0.6%), respectively. Furthermore, the biocoke derived from the hydrous pyrolysed torrefied lignin did not agglomerate, which could not be explained by changes in the chemical properties of the material and requires further investigation.
Publisher version (URL)https://doi.org/10.1016/j.jaap.2016.11.010
URIhttp://hdl.handle.net/10261/184864
DOI10.1016/j.jaap.2016.11.010
ISSN0165-2370
E-ISSN1873-250X
Appears in Collections:(INCAR) Artículos
Files in This Item:
File Description SizeFormat 
JAAP_Evaluation_Hydrochars_Castro.pdf1,82 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.