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Simultaneous pretreatment and hydrolysis of hardwood biomass species catalyzed by combination of modified activated carbon and ionic liquid in biphasic system

Tyagi, Uplabdhi, Anand, Neeru, Kumar, Dinesh
Bioresource technology 2019 v.289 pp. 121675
Catalpa bignonioides, Dalbergia sissoo, Fourier transform infrared spectroscopy, Melia azedarach, Vachellia nilotica, X-ray diffraction, activated carbon, aluminum chloride, biomass, catalytic activity, dimethyl sulfoxide, electrolytes, hardwood, hydrolysis, hydroxymethylfurfural, ionic liquids, magnesium chloride, potassium chloride, reducing sugars, sodium chloride, sulfuric acid, synergism
The study highlights one pot conversion of hardwood biomass into Total reducing sugars (TRS) and 5-Hydroxymethyl Furfural (5-HMF). Synergistic effect of dilute H2SO4 and ionic liquid in a reaction time of 60 min at 120 °C was examined. Hydrolysis of Catalpa (Catalpa Bignonioides), Indian Rosewood (Dalbergia Sissoo), Chinaberry (Melia Azedarach) and Babool (Acacia Nilotica) catalyzed by modified activated carbon leads to significant product yield. Maximum yield was obtained using Catalpa wood i.e. 92.67% TRS and 70.36% 5-HMF under optimized conditions. Biomass before and after pretreatment subjected to FT-IR, XRD and compositional analysis determined the structural changes. Further, the effect of electrolytes namely; AlCl3, MgCl2, NaCl and KCl were evaluated. Results revealed that using optimized concentration of each electrolyte promoted the conversion to 96.56% (TRS) and 86.23% (5-HMF) using AlCl3 (4 wt%) for Catalpa wood. Addition of DMSO with optimized electrolyte concentration improves the partition coefficient (3.3) and yield to 88.29% (5-HMF).