Journal
CHEMSUSCHEM
Volume 8, Issue 6, Pages 1026-1033Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201403385
Keywords
biomass; carbohydrates; hydrolysis; kinetics; water chemistry
Funding
- Spanish Ministry of Economy and Competitiveness [CTQ2013-44143-R, CTQ2011-27347, ENE2012-33613, RYC-2013-13976]
Ask authors/readers for more resources
At extremely low reaction times (0.02s), cellulose was hydrolyzed in supercritical water (T=400 degrees C and P=25MPa) to obtain a sugar yield higher than 95wt%, whereas the 5-hydroxymethylfurfural (5-HMF) yield was lower than 0.01wt%. If the reaction time was increased to 1s, the main product was glycolaldehyde (60wt%). Independently of the reaction time, the yield of 5-HMF was always lower than 0.01wt%. To evaluate the reaction mechanism of biomass hydrolysis in pressurized water, several parameters (temperature, pressure, reaction time, and reaction medium) were studied for different biomasses (cellulose, glucose, fructose, and wheat bran). It was found that the H+ and OH- ion concentration in the reaction medium as a result of water dissociation is the determining factor in the selectivity. The reaction of glucose isomerization to fructose and the further dehydration to 5-HMF are highly dependent on the ion concentration. By an increase in the pOH/pH value, these reactions were minimized to allow control of 5-HMF production. Under these conditions, the retroaldol condensation pathway was enhanced, instead of the isomerization/dehydration pathway.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available