التفاصيل البيبلوغرافية
| العنوان: |
Ionic liquid pre-treatment and fractionation of sugarcane bagasse for the production of bioethanol |
| المؤلفون: |
Karatzos, Sergios |
| بيانات النشر: |
Queensland University of Technology |
| سنة النشر: |
2011 |
| المجموعة: |
Queensland University of Technology: QUT ePrints |
| مصطلحات موضوعية: |
sugarcane, bagasse, lignocellulosics, lignin, cellulose, ionic liquids, pretreatment, decrystallisation, fractionation, aqueous biphasic systems, saccharification, ethanol, biofuel |
| الوصف: |
Pretretament is an essential and expensive processing step for the manufacturing of ethanol from lignocellulosic raw materials. Ionic liquids are a new class of solvents that have the potential to be used as pretreatment agents. The attractive characteristics of ionic liquid pretreatment of lignocellulosics such as thermal stability, dissolution properties, fractionation potential, cellulose decrystallisation capacity and saccharification impact are investigated in this thesis. Dissolution of bagasse with 1-butyl-3-methylimidazolium chloride ([C4mim]Cl) at high temperatures (110 �‹C to 160 �‹C) is investigated as a pretreatment process. Material balances are reported and used along with enzymatic saccharification data to identify optimum pretreatment conditions (150 �‹C for 90 min). At these conditions, the dissolved and reprecipitated material is enriched in cellulose, has a low crystallinity and the cellulose component is efficiently hydrolysed (93 %, 3 h, 15 FPU). At pretreatment temperatures < 150 �‹C, the undissolved material has only slightly lower crystallinity than the starting. At pretreatment temperatures . 150 �‹C, the undissolved material has low crystallinity and when combined with the dissolved material has a saccharification rate and extent similar to completely dissolved material (100 %, 3h, 15 FPU). Complete dissolution is not necessary to maximize saccharification efficiency at temperatures . 150 �‹C. Fermentation of [C4mim]Cl-pretreated, enzyme-saccharified bagasse to ethanol is successfully conducted (85 % molar glucose-to-ethanol conversion efficiency). As compared to standard dilute acid pretreatment, the optimised [C4mim]Cl pretreatment achieves substantially higher ethanol yields (79 % cf. 52 %) in less than half the processing time (pretreatment, saccharification, fermentation). Fractionation of bagasse partially dissolved in [C4mim]Cl to a polysaccharide rich and a lignin rich fraction is attempted using aqueous biphasic systems (ABSs) and single phase systems with preferential ... |
| نوع الوثيقة: |
thesis |
| وصف الملف: |
application/pdf |
| اللغة: |
unknown |
| العلاقة: |
https://eprints.qut.edu.au/55172/1/Sergios_Karatzos_Thesis.pdfTest; Karatzos, Sergios (2011) Ionic liquid pre-treatment and fractionation of sugarcane bagasse for the production of bioethanol. PhD thesis, Queensland University of Technology.; https://eprints.qut.edu.au/55172Test/; Faculty of Science and Technology |
| الإتاحة: |
https://eprints.qut.edu.au/55172Test/ |
| حقوق: |
free_to_read |
| رقم الانضمام: |
edsbas.18361AD5 |
| قاعدة البيانات: |
BASE |
