TY - JOUR
T1 - Measuring the concentration of carboxylic acid groups in torrefied spruce wood
AU - Khazraie Shoulaifar, Tooran
AU - De Martini, Nikolai
AU - Ivaska, Ari
AU - Fardim, Pedro
AU - Hupa, Mikko
PY - 2012
Y1 - 2012
N2 - Torrefaction is moderate thermal treatment (similar to 200-300 degrees C) to improve the energy density, handling and storage properties of biomass fuels. In biomass, carboxylic sites are partially responsible for its hygroscopic. These sites are degraded to varying extents during torrefaction. In this paper, we apply methylene blue sorption and potentiometric titration to measure the concentration of carboxylic acid groups in spruce wood torrefied for 30 min at temperatures between 180 and 300 degrees C. The results from both methods were applicable and the values agreed well. A decrease in the equilibrium moisture content at different humidity was also measured for the torrefied wood samples, which is in good agreement with the decrease in carboxylic acid sites. Thus both methods offer a means of directly measuring the decomposition of carboxylic groups in biomass during torrefaction as a valuable parameter in evaluating the extent of torrefaction which provides new information to the chemical changes occurring during torrefaction.
AB - Torrefaction is moderate thermal treatment (similar to 200-300 degrees C) to improve the energy density, handling and storage properties of biomass fuels. In biomass, carboxylic sites are partially responsible for its hygroscopic. These sites are degraded to varying extents during torrefaction. In this paper, we apply methylene blue sorption and potentiometric titration to measure the concentration of carboxylic acid groups in spruce wood torrefied for 30 min at temperatures between 180 and 300 degrees C. The results from both methods were applicable and the values agreed well. A decrease in the equilibrium moisture content at different humidity was also measured for the torrefied wood samples, which is in good agreement with the decrease in carboxylic acid sites. Thus both methods offer a means of directly measuring the decomposition of carboxylic groups in biomass during torrefaction as a valuable parameter in evaluating the extent of torrefaction which provides new information to the chemical changes occurring during torrefaction.
KW - Carboxylic acid groups
KW - Methylene blue sorption
KW - Potentiometric titration
KW - Spruce wood
KW - Torrefaction
KW - Carboxylic acid groups
KW - Methylene blue sorption
KW - Potentiometric titration
KW - Spruce wood
KW - Torrefaction
KW - Carboxylic acid groups
KW - Methylene blue sorption
KW - Potentiometric titration
KW - Spruce wood
KW - Torrefaction
U2 - 10.1016/j.biortech.2012.07.069
DO - 10.1016/j.biortech.2012.07.069
M3 - Artikel
SN - 0960-8524
VL - 123
SP - 338
EP - 343
JO - Bioresource Technology
JF - Bioresource Technology
ER -