Process optimization of 2,5-furandicarboxylic acid synthesis from potassium bisaccharate catalyzed with HBr-LiBr
2,5-furandicarboxylic acid(2,5-FDCA)is a bio-based polyester monomer with great potential,and it is promising to produce 2,5-FDCA from saccharic acids.In order to find a more suitable catalytic system for industrialization,this work optimized the process of 2,5-FDCA synthesis from cyclodehydration of potassium bisaccharate catalyzed with HBr-LiBr.The solvent screening results show that solvents containing O=S=O can facilitate the reaction.A possible cyclization mechanism of solvent effects on potassium bisaccharate and sulfolane was proposed.The optimal catalyst ratio for 2,5-FDCA preparation by cyclodehydration of potassium bisaccharate was obtained as w(HBr)=2%,w(LiBr)=5%,and the yield of 2,5-FDCA was 81.1%.The kinetic data for the preparation of 2,5-FDCA from cyclodehydration of potassium bisaccharate with different substrate concentrations were determined,and the reaction rate constant decreased gradually with the increase of substrate concentration.Water content was a sensitive parameter in the HBr-LiBr catalytic system,and when the water content increased from 2.2%to 8.2%,the yield of 2,5-FDCA decreased from 75.2%to 20.6%.This work provide important basic data for the production of 2,5-FDCA from saccharic acids.
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