Kinetics and Dynamics of Conversion of Bambusa Bamboo into 5-Hydroxymethylfurfural in Ionic Solvent in Batch Reactor

In this era of industrial revolution and diminishing petroleum reserves, alternative options (woody biomass) for building next-generation fuels need to be critically explored. Here, process engineering aspects of 5-hydroxymethylfurfural (5-HMF) from Bambusa bamboo in ionic liquid ([Bmim]Cl) in the presence of a catalyst, CrCl3, in batch reactor have been explored in great detail. 5-HMF upon hydrogenation liberates 2,5-dimethylfuran (DMF), which is a liquid fuel. To maximize the production of platform chemical-5-HMF, effects of different mixing speeds (150-1200 rpm) and temperatures (120-160 & DEG;C) were captured on the yield of 5-HMF and glucose. A highest 5-HMF yield (25%) was obtained at 120 & DEG;C and 1200 rpm within a reaction time of 6 h. Moreover, a kinetic analysis of transformation of biomass into 5-HMF was carried out using curve fitting to estimate kinetic constants k(1), k(2), and k(3). Mixing at asymptotic limits, i.e., no mixing (0 rpm) and very high mixing (1200 rpm), enables us to devise mixing regimes: 0-400 rpm, mass transfer-limited regime; 400-1100 rpm, intermediate regime; and > 1100 rpm, reaction-limited regime. Thus, tremendous improvement in reaction rate constants (k(1), k(2), k(3)) was observed when operated at higher mixing conditions (reaction-limited regime). Mixing limitation for this IL-based system can be eliminated by operating the reactor above 800 rpm, whereas lower temperature restricts conversion of 5-HMF to LA and FA. Hence, higher mixing speeds, i.e., > 1100 rpm, and lower temperature, i.e., & AP; 120 & DEG;C, can be suggested as the optimum operating conditions for maximization of platform chemical-5-HMF in the catalytic conversion of Bambusa bamboo in batch reactor.

Automated summary

In this study, the process engineering aspects of producing 5-hydroxymethylfurfural (5-HMF) from Bambusa bamboo using CrCl3 catalyst and ionic liquid ([Bmim]Cl) in a batch reactor were explored in detail. The highest yield of 5-HMF (25%) was obtained at a reaction temperature of 120℃ and a stirring speed of 1200 rpm. Additionally, operating the reactor at high stirring conditions (reaction-limited regime) significantly improved the reaction rate constants (k(1), k(2), k(3)). It is suggested that operating at a stirring speed >1100 rpm and a temperature <120℃ in the batch reactor will maximize the production of 5-HMF from Bambusa bamboo.