Optimization of sulfuric acid-assisted glycerol pretreatment of sugarcane bagasse
-
Carlos Martín
,
Jürgen Puls
Abstract
A combined pretreatment of sugarcane bagasse with glycerol and sulfuric acid was investigated based on a central composite rotatable experimental design. The following factors were varied: temperature (150–199°C), time (0.69–2.3 h), H2SO4 concentration (0.0–1.1%), and glycerol concentration (55.4–79.6%). Xylans and lignin were considerably solubilized during pretreatment. Xylan solubilization, ranging between 6% and 94%, increased significantly with the increase of temperature, time, and H2SO4 concentration and dropped with the increase of glycerol amount. Glycerol restricted the solubilization and full hydrolysis of xylans and the degradation of xylose. Lignin solubilization (20.6–49.4%) increased with the increase of all the experimental factors. Cellulose recovery, which was generally high, increased with the increasing of glycerol concentration and declined at high levels of the other factors. Recoveries above 97% were achieved at low H2SO4 concentration and high glycerol load, whereas the lowest value (83.4%) was achieved in the longest-lasting experiment. The models based on the experimental results predicted the maximal lignin solubilization at 187.7°C, 2.3 h, 79.6% glycerol, and 0.64% H2SO4, whereas the highest yield of enzymatic hydrolysis can be expected at 194.1°C, 1.67 h, 79.6% glycerol, and 1.1% H2SO4. The optimal conditions were confirmed in control experiments. The synergistic effect of sulfuric acid and glycerol on the enzymatic hydrolysis of cellulose was demonstrated.
The financial support given by the Alexander von Humboldt Foundation is gratefully acknowledged. Ms. Nicole Erasmy, Mr. Sascha Lebioda, Mr. Bernhard Ziegler, and Ms. Anna Knoepfle are thanked for their technical assistance.
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Articles in the same Issue
- Masthead
- Masthead
- Original Articles
- Biorefinery in a pulp mill: simultaneous production of cellulosic fibers from Eucalyptus globulus by soda-anthraquinone cooking and surface-active agents
- Thermomechanical pulping of novel Brazilian Eucalyptus hybrids
- Contribution of xylan to the brightness development and stability in the final ECF bleaching of eucalypt (Eucalyptus globulus Labill.) kraft pulp
- Chemistry and kraft pulping of seven hybrid aspen clones. Dimension measurements on the vessels and UMSP of the cell walls
- The role of Donnan effect in kraft cooking liquor impregnation and hot water extraction of wood
- Optimization of sulfuric acid-assisted glycerol pretreatment of sugarcane bagasse
- Laser-induced fluorescence (LIF) of lignin and lignin model compounds in Raman spectroscopy
- Polyoxometalate (POM)-aided modification of lignin from wheat straw biorefinery
- Salting-out and salting-in experiments with lignosulfonates (LSs)
- Determination of the diffusion of monovalent cations into wood under isothermal conditions based on LiCl impregnation of Norway spruce
- Modification of hemicelluloses with polycarboxylic acids
- Tailoring the effect of antibacterial polyelectrolyte multilayers by choice of cellulosic fiber substrate
- Elaboration of multilayered thin films based on cellulose nanocrystals and cationic xylans: application to xylanase activity detection
- Characterization of the pore structure of nanoporous activated carbons produced from wood waste
- Sorption properties of hydrothermally modified wood and data evaluation based on the concept of Hansen solubility parameter (HSP)
- Meetings
- Meetings
Articles in the same Issue
- Masthead
- Masthead
- Original Articles
- Biorefinery in a pulp mill: simultaneous production of cellulosic fibers from Eucalyptus globulus by soda-anthraquinone cooking and surface-active agents
- Thermomechanical pulping of novel Brazilian Eucalyptus hybrids
- Contribution of xylan to the brightness development and stability in the final ECF bleaching of eucalypt (Eucalyptus globulus Labill.) kraft pulp
- Chemistry and kraft pulping of seven hybrid aspen clones. Dimension measurements on the vessels and UMSP of the cell walls
- The role of Donnan effect in kraft cooking liquor impregnation and hot water extraction of wood
- Optimization of sulfuric acid-assisted glycerol pretreatment of sugarcane bagasse
- Laser-induced fluorescence (LIF) of lignin and lignin model compounds in Raman spectroscopy
- Polyoxometalate (POM)-aided modification of lignin from wheat straw biorefinery
- Salting-out and salting-in experiments with lignosulfonates (LSs)
- Determination of the diffusion of monovalent cations into wood under isothermal conditions based on LiCl impregnation of Norway spruce
- Modification of hemicelluloses with polycarboxylic acids
- Tailoring the effect of antibacterial polyelectrolyte multilayers by choice of cellulosic fiber substrate
- Elaboration of multilayered thin films based on cellulose nanocrystals and cationic xylans: application to xylanase activity detection
- Characterization of the pore structure of nanoporous activated carbons produced from wood waste
- Sorption properties of hydrothermally modified wood and data evaluation based on the concept of Hansen solubility parameter (HSP)
- Meetings
- Meetings
