Kinetics of combined noncatalytic and catalytic hydrolysis of jute fiber under ultrasonic-far infrared energy synergy

摘要

Hydrolysis of pretreated waste jute fiber was intensified for maximizing reducing sugar (RS) yield deploying a novel reactor equipped with ultrasonic-far-infrared-waves (US-FIRW). At optimal 70 degrees C temperature, 2.5 wt% Amberlyst-15 catalyst concentration, 15 min hydrolysis time and 10 (wt/wt) water loading; US-FIRW rendered significantly greater RS yield (74.82 mol%) compared to other reactors provided with far-infrared-wave (69.63 mol%), ultrasonication (50.34 mol%), and conventional thermal system (48.16 mol%). Kinetic models were developed considering noncatalytic-pseudo-homogenous (NCPH) in addition to the combined catalytic-pseudo-homogeneous (CPH) and catalytic heterogeneous (CHE) hydrolysis pathways. The results revealed that pseudo-homogenous-heterogeneous Eley-Rideal (PHHER) model could represent the hydrolysis kinetics most accurately. Remarkably, the lowest activation energy [16.75 kJ mol(-1) (NCPH), 13.82 kJ mol(-1) (CPH), 40.01 kJ mol(-1) (CHE)] required in US-FIRW evidently established its greater energy-efficiency among investigated reactors. The novel reactor and the simulated kinetic models can be applicable to other lignocellulosic biomass conversion for sustainable biorefinery.