Novel Kinetic Models of Xylan Dissolution and Degradation during Ethanol Based Auto-Catalyzed Organosolv Pretreatment of Bamboo
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Ethanol Based Auto-Catalyzed Organosolv (EACO) Pretreatment
2.3. Analysis of Pretreatment Hydrolysates and Solid Substrates
2.3.1. Compositional Analysis of Raw Material and Substrates
2.3.2. Measurement of Degradations Concentration in Pretreatment Hydrolysates
3. Results and Discussion
3.1. Development of Kinetic Models
3.1.1. Kinetic Model of Xylan Dissolution
3.1.2. Kinetic Model of Xylo-Oligosaccharides Formation
3.1.3. Kinetic Model of Xylose Formation
3.2. Determination of Kinetic Constants
3.2.1. The dx and Reaction Rate Constants
3.2.2. Activation Energy and Pre-Exponential Factor
3.3. The Relationship between the dX and Pretreatment Conditions
3.4. Predicting the Formations of Furfural and Acetic Acid
3.5. The Relationships between Xylan and Other Main Component Removal
3.5.1. The Relationship between Xylan and Glucan Removal
3.5.2. The Relationship between Xylan and Klason Lignin Removal
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Ethanol content (%, v/v) | Pretreatment temperature (K) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
443 | 458 | 473 | ||||||||||
dx | k1 | k2 | k3 | dx | k1 | k2 | k3 | dx | k1 | k2 | k3 | |
0 | NA | NA | NA | NA | 0.7878 | 0.0735 | 0.0344 | 0.0214 | NA | NA | NA | NA |
20 | 0.3844 | 0.0297 | 0.0175 | 0.0101 | 0.6586 | 0.0623 | 0.0199 | 0.0189 | 0.7723 | 0.1077 | 0.0530 | 0.0431 |
40 | 0.2450 | 0.0165 | 0.0156 | 0.0037 | 0.5355 | 0.0486 | 0.0185 | 0.0148 | 0.6346 | 0.0794 | 0.0336 | 0.0267 |
60 | 0.1293 | 0.0093 | 0.0046 | 0.0010 | 0.3670 | 0.0327 | 0.0169 | 0.0121 | 0.4812 | 0.0387 | 0.0243 | 0.0221 |
80 | NA | NA | NA | NA | 0.2272 | 0.0162 | 0.0135 | 0.0103 | NA | NA | NA | NA |
98 | NA | NA | NA | NA | 0.1218 | 0.0158 | 0.0098 | 0.0090 | NA | NA | NA | NA |
k | k0 (min−1) | Ea (kJ/mol) | α | F value | p value |
---|---|---|---|---|---|
k1 | 2.72 × 109 | 83.16 | 0.88 | 59.1280 | 0.0000 |
k2 | 1.12 × 107 | 68.19 | 0.63 | 20.1566 | 0.0010 |
k3 | 4.38 × 1013 | 126.84 | 0.69 | 18.2701 | 0.0006 |
Degradation products (DPs) | Parameters in empirical model (Equation (40)) | |||
---|---|---|---|---|
MP0 (min) | ∆MP | δ | ε | |
Furfural (F) | 12,984.6 | 3474.0 | 0.0760 | 7.4865 |
Acetic acid (AA) | 10,933.0 | 4025.4 | 0.0689 | 7.8696 |
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Liu, J.; Gong, Z.; Yang, G.; Chen, L.; Huang, L.; Zhou, Y.; Luo, X. Novel Kinetic Models of Xylan Dissolution and Degradation during Ethanol Based Auto-Catalyzed Organosolv Pretreatment of Bamboo. Polymers 2018, 10, 1149. https://doi.org/10.3390/polym10101149
Liu J, Gong Z, Yang G, Chen L, Huang L, Zhou Y, Luo X. Novel Kinetic Models of Xylan Dissolution and Degradation during Ethanol Based Auto-Catalyzed Organosolv Pretreatment of Bamboo. Polymers. 2018; 10(10):1149. https://doi.org/10.3390/polym10101149
Chicago/Turabian StyleLiu, Jing, Zhenggang Gong, Guangxu Yang, Lihui Chen, Liulian Huang, Yonghui Zhou, and Xiaolin Luo. 2018. "Novel Kinetic Models of Xylan Dissolution and Degradation during Ethanol Based Auto-Catalyzed Organosolv Pretreatment of Bamboo" Polymers 10, no. 10: 1149. https://doi.org/10.3390/polym10101149