Efficient production of 5-hydroxymethylfurfural (HMF) through the dehydration of sugars was achieved by developing a new catalyst caprolactam hydrogen sulfate ([CPL]HSO4) ionic liquid or using metal halide as the co-catalyst in a new water/proprylene glycol monomethyl ether solvent system. With an optimum synthesis condition, the yield of HMF derived from fructose dehydration at 105 °C for 90 min is as high as 80.5 % in the presence of [CPL]HSO4. The nature behind the attractive results was revealed by proposing the catalysis mechanism of the fructose dehydration. The yield of HMF is about 70 % using [CPL]HSO4 as the catalyst for fructose dehydration after being reused five times. The catalyst system [CPL]HSO4/metal halide was used for the dehydration of sucrose, and the optimum yield is as high as 64–68 %.
Research on Chemical Intermediates – Springer Journals
Published: Apr 10, 2014
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