Carbohydrates are an important part of biomass and can be converted into a series of high value-added chemicals through catalytic conversion
which has the advantages of high economic value
environmental friendliness and sustainability. Isomerization of glucose into fructose is a key step in the process. Herein
four basic functional ionic liquids: [HOEtMim
]
Phen
[EMim
]
Phen
[HOEtMim
]
Im
[Ch
]
Phen were synthesized and their catalytic performances on glucose isomerization were investigated. A comparison of direct transformation and catalysts combined with sodium borate complex was discussed. It showed that four basic ionic liquids exhibit good catalytic activities
but fructose is easily to be further degraded. While ionic liquids added with sodium borate obtain much higher fructose yields. It indicates that sodium borate plays an important role in both protective agent and synergistic catalysis. [Ch
]
Phen added with sodium borate is the most efficient. The basic structure parameters of [Ch
]
Phen were further characterized by
1
H NMR
FT-IR and TG-DTG techniques. The effects of reaction temperature
reaction time
the dosage of catalyst and sodium borate on the isomerization and the optimal reaction conditions were investigated by single factor method. The yield of fructose is up to 64.7% with a high selectivity of 73.1% under the optimum condition at 70℃ within 7 min.
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references
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