One-Pot Conversion of Corn Starch into 5-Hydroxymethylfurfural in Water-[Bmim]Cl/MIBK Biphasic Media
2016
Roy Goswami, Shrestha | Mukherjee, Agneev | Dumont, Marie-Josée | Raghavan, Vijaya
This work reports the catalytic conversion of corn starch into 5-hydroxymethylfurfural (HMF) in the presence of AlCl₃·6H₂O in water-[Bmim]Cl/MIBK biphasic media. Among the varieties of corn starch investigated (regular, waxy, and native high amylose), a maximum of 64 wt % HMF was obtained from waxy corn substrates within 20 min of reaction time at 140 °C. The HMF yield was comparable to the yield obtained from fructose and glucose which were of 70 and 68 wt % respectively. Furthermore, MIBK effectively partitioned HMF from the aqueous to the organic phase, thereby preventing further HMF rehydration to levulinic acid (LA). Thus, negligible LA yields (0.1 wt %) were detected in this system. Additionally, [Bmim]Cl and AlCl₃·6H₂O can be recycled for several catalytic runs without compromising the HMF selectivity. In summary, the proposed process parameters are favorable to achieve high HMF yields from amylopectin-rich starches.
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