title: Hydrolysis of microcrystalline cellulose using functionalized Bronsted acidic ionic liquids - A comparative study.
abstract: Cellulose conversion to platform chemicals is required to meet the demands of increasing population and modernization of the world. Hydrolysis of microcrystalline cellulose was studied with SO3H, COOH and OH functionalized imidazole based ionic liquid using 1-butyl-3-methylimidazolium chloride [BMIM]Cl as a solvent. The influence of temperature, time, acidity of ionic liquids and catalyst loading was studied on hydrolysis reaction. The maximum %TRS yield 85%, was obtained at 100°C and 90min with 0.2g of SO3H functionalized ionic liquid. UV-vis spectroscopy using 4-nitro aniline as an indicator was performed to find out the Hammett function of ionic liquid and acidity trends are as follows: SO3H>COOH>OH. Density functional theory (DFT) calculations were performed to optimize the ionic liquid and their conjugate bases at B3LYP 6-311G++ (d, p) level using Gaussian 09 program. Theoretical findings are in agreement with the experimental results.
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. Electronic address: chz118336@chemical.iitd.ac.in.
authors.forename: Firdaus
authors.initials: F
authors.lastname: Parveen
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. Electronic address: chz118239@chemical.iitd.ac.in.
authors.forename: Tanmoy
authors.initials: T
authors.lastname: Patra
authors.affiliation: Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. Electronic address: sreedevi@chemical.iitd.ac.in.
authors.forename: Sreedevi
authors.initials: S
authors.lastname: Upadhyayula
mesh_terms: D000438:Alcohols / Q000737:chemistry; D002264:Carboxylic Acids / Q000737:chemistry; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D006868:Hydrolysis; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D013451:Sulfonic Acids / Q000737:chemistry; D013696:Temperature
chemical_list: D000438:Alcohols; D002264:Carboxylic Acids; D007093:Imidazoles; D052578:Ionic Liquids; D013451:Sulfonic Acids; C502841:1-butyl-3-methylimidazolium chloride; D002482:Cellulose; C109691:microcrystalline cellulose
keywords: Acidity; Catalyst; DFT; Functionalized ionic liquid; Hammett function; Hydrolysis; Microcrystalline cellulose