Method for preparing GBL (Gamma-Butyrolactone) by taking furfural as raw material
A technology of butyrolactone and furfural, which is applied in the field of preparation of γ-butyrolactone, can solve the problems of low selectivity, slow reaction rate, and complicated process, and achieve the effects of avoiding high pollution, mild operating conditions, and simple process flow
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[0039] Example 1
[0040] Furfural oxidation reaction: add 4.0g furfural, 4.0g anhydrous sodium sulfate, 1.5ml formic acid and 1.5ml deionized water into 10ml 1,2-dichloroethane, inject 10ml hydrogen peroxide (30%), The reaction was stirred for 2.5 hours under normal pressure at °C. After the reaction, it was allowed to stand and separate into layers. The organic phase was subjected to vacuum distillation treatment to obtain 2(5H)-furanone with a yield of 60% and a dibasic acid yield of 18% in the aqueous phase.
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[0041] Example 2
[0042] Furfural oxidation reaction: add 4.0g furfural, 4.0g anhydrous sodium sulfate, 1.5ml formic acid and 1.5ml deionized water to 10ml ethyl acetate, inject 10ml hydrogen peroxide (30%), and stir at 60℃ under normal pressure The reaction was carried out for 2.5 hours, after the reaction, the layers were allowed to stand still, and the organic phase was subjected to reduced pressure distillation to obtain 62% of the yield of 2(5H)-furanone, and 15% of the dibasic acid in the water phase.
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[0043] Example 3
[0044] Furfural oxidation: add 4.0g furfural, 4.0g anhydrous sodium sulfate, 1.5ml formic acid to 10ml methanol, inject 10ml hydrogen peroxide (30%), stir and react for 2.5 hours at 60℃ and normal pressure, 2(5H)- The yield of furanone was 13%, and the yield of dibasic acid was 48%.
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