Patent ID: 11873286
Assignee: SHANGHAI WOKAI BIOTECHNOLOGY CO., LTD.
Field: Organic fine chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for preparing 2,5-furandicarboxylic acid (FDCA) from furfural, comprising the following steps:
(1) under anhydrous conditions, mixing an acylation reagent with an ionic liquid (IL) to obtain a transparent mixed liquid A;
(2) pretreatment of the furfural: subjecting the furfural and an alcohol compound to an acetalization reaction under catalysis of an acidic ion resin to obtain an acetal compound of the furfural with the alcohol compound;
(3) under stirring, adding the acetal compound obtained in step (2) dropwise to the mixed liquid A obtained in step (1) to allow a reaction for 1 h to 2 h, adding a catalyst to continue the reaction for 3 h to 5 h, and subjecting a resulting reaction system to a post-treatment to obtain 5-acylfurfural; and
(4) mixing the 5-acylfurfural obtained in step (3) with hydrogen peroxide, adding a catalyst to allow an oxidation reaction, and after the oxidation reaction is completed, subjecting a product to washing and recrystallization to obtain a white crystal, FDCA.