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Keywords:

  • 5-hydroxymethylfurfural;
  • fructose;
  • biphasic system;
  • stirring speed;
  • high-fructose solution addition

Abstract

BACKGROUND

5-hydroxymethylfurfural (HMF) has attracted increasing attention so that an efficient process for HMF production from high-sugar solution is needed for the successful commercialization of this versatile intermediate in the production of high value chemicals.

RESULTS

Two simple operations, mechanical stirring control and high-fructose solution addition, were applied to the water/butanol system for enhancing fructose-to-HMF reaction using HCl as catalyst. The optimization of stirring speed led to a high HMF yield of 81.7% with 92.0% fructose conversion (0.3 moL L−1 HCl, 1000 rpm). Moreover, a reasonable mechanism describing the effect of stirring speed on HMF yield was proposed. During the process of high-fructose solution (54.6 wt%) addition, the yields of HMF after four additions in every experiment all exceeded 55%, and a HMF yield of 83.3% was achieved after three additions at 1000 rpm.

CONCLUSIONS

The optimization of mechanical stirring in aqueous/butanol media led to a high HMF yield. By studying the kinetics of the fructose-to-HMF reaction, it was demonstrated that a low value of reaction rate constant is of benefit to obtain high HMF yield for this biphasic system. The simple addition process greatly reduced the side-reaction and made the operation more continuous and stable, and thus provided a practical and effective method of HMF preparation in high-fructose solution. © 2013 Society of Chemical Industry