Abstract
Due to the invalidity of traditional models, pretreatment conditions dependent parameter of susceptible dissolution degree of xylan (dX) was introduced into the kinetic models. After the introduction of dX, the dissolution of xylan, and the formation of xylo-oligosaccharides and xylose during ethanol based auto-catalyzed organosolv (EACO) pretreatments of bamboo were well predicted by the pseudo first-order kinetic models (R2 > 97%). The parameter of dX was verified to be a variable dependent of EACO pretreatment conditions (such as solvent content in pretreatment liquor and pretreatment temperature). Based on the established kinetic models of xylan dissolution, the dissolution of glucan and the formation of degradation products (furfural and acetic acid) could also be empirically modeled (R2 > 97%). In addition, the relationship between xylan and lignin removal can provide guidance for alleviating the depositions of lignin or pseudo-lignin. The parameter of dX derived novel kinetic models can not only be used to reveal the multi-step reaction mechanisms of xylan, but also control the final removal of main components in bamboo during EACO pretreatments, indicating scientific and practical significance for governing the biorefinery of woody biomass.
Highlights
IntroductionClean and efficient fractionation of main components (i.e., cellulose, hemicellulose and lignin) in the biorefinery process is the prerequisite for realizing high-value utilization of woody biomass [1,2].Among various pretreatment methods (such as hot water, dilute acid, dilute alkali and steam explosion, etc.), organosolv pretreatment has become one of the most effective methods because of its efficient fractionation of non-cellulosic components (hemicellulose and lignin) in woody biomass [3,4]
Clean and efficient fractionation of main components in the biorefinery process is the prerequisite for realizing high-value utilization of woody biomass [1,2].Among various pretreatment methods, organosolv pretreatment has become one of the most effective methods because of its efficient fractionation of non-cellulosic components in woody biomass [3,4]
The foregoing studies indicated that xylan dissolution followed the pseudo first-order kinetics during ethanol-based acid-catalytic organosolv pretreatment [18,23]
Summary
Clean and efficient fractionation of main components (i.e., cellulose, hemicellulose and lignin) in the biorefinery process is the prerequisite for realizing high-value utilization of woody biomass [1,2].Among various pretreatment methods (such as hot water, dilute acid, dilute alkali and steam explosion, etc.), organosolv pretreatment has become one of the most effective methods because of its efficient fractionation of non-cellulosic components (hemicellulose and lignin) in woody biomass [3,4]. According to different types of solvent, organosolv pretreatment can be categorized into low-boiling alcohol, high-boiling alcohol, small molecular organic acid and other solvents (acetone, tetrahydrofuran, dimethyl sulfoxide and γ-valerolactone, etc.) based pretreatments [5]. The disadvantages associated with high-boiling alcohol, small molecular organic acid and other solvents based acid catalyzed organosolv pretreatment, such as uncompetitive solvent cost, equipment. Polymers 2018, 10, 1149 organic acid and other solvents based acid catalyzed organosolv pretreatment, such as uncompetitive solvent cost, equipment corrosion and lignin condensation, make them less promising for industrial applicationsmake than them low-boiling alcohol based auto-catalytic organosolv corrosion and lignin condensation, less promising for industrial applications than pretreatment [5,7,8].based. In reference to the latter, pretreatment superior to other low-boiling alcohol (e.g., methanol) based pretreatment byalcohol virtue ethanol-basedisauto-catalytic organosolv pretreatment is superior to other low-boiling of being less toxic andpretreatment bio-derivedby [8],virtue and of it being has demonstrated industrialization based less toxic andsignificant bio-derived [8], and it has potentials (suchsignificant as Alcell process [6])
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