Pretreatment of sugarcane bagasse by acid-catalysed process in aqueous ionic liquid solutions.
A biomass pretreatment process was developed using acidified ionic liquid (IL) solutions containing 10-30% water. Pretreatment of sugarcane bagasse at 130°C for 30 min by aqueous 1-butyl-3-methylimidazolium chloride (BMIMCl) solution containing 1.2% HCl resulted in a glucan digestibility of 94-100% after 72 h of enzymatic hydrolysis. HCl was found to be a more effective catalyst than H(2)SO(4) or FeCl(3). Increasing acid concentration (from 0.4% to 1.2%) and reaction temperature (from 90 to 130°C) increased glucan digestibility. The glucan digestibility of solid residue obtained with the acidified BMIMCl solution that was re-used for three times was >97%. The addition of water to ILs for pretreatment could significantly reduce IL solvent costs and allow for increased biomass loadings, making the pretreatment by ILs a more economic proposition.
Syngenta Centre for Sugarcane Biofuels Development, Queensland University of Technology, Brisbane, Australia. jan.zhang@qut.edu.au
Zhanying
Z
Zhang
Ian M
IM
O'Hara
William O S
WO
Doherty
D001709:Biotechnology / Q000379:methods*; D002384:Catalysis / Q000187:drug effects; D002482:Cellulose / Q000737:chemistry* / Q000648:ultrastructure; D005936:Glucans / Q000378:metabolism; D005947:Glucose / Q000096:biosynthesis; D006851:Hydrochloric Acid / Q000494:pharmacology*; D006868:Hydrolysis / Q000187:drug effects; D007093:Imidazoles / Q000494:pharmacology*; D052578:Ionic Liquids / Q000494:pharmacology*; D007700:Kinetics; D031786:Saccharum / Q000737:chemistry* / Q000187:drug effects; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013464:Sulfuric Acids / Q000494:pharmacology*; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
D005936:Glucans; D007093:Imidazoles; D052578:Ionic Liquids; D012996:Solutions; D013464:Sulfuric Acids; D014867:Water; C502841:1-butyl-3-methylimidazolium chloride; D002482:Cellulose; C027433:bagasse; D005947:Glucose; C033158:sulfuric acid; D006851:Hydrochloric Acid