Integrated multi-unit method for co-production of 2,5-diformylfuran and 2,5-furandicarboxylic acid based on biphasic solvent system

An integrated multi-unit method for co-production of 2,5-diformylfuran and 2,5-furandicarboxylic acid based on a biphasic solvent system, which is implemented on the basis of a feedstock pretreatment unit, a reaction unit, a separation unit, a recycling unit and a recovery unit, wherein

• in the integrated multi-unit method, first, 5-hydroxymethylfurfural enters the feedstock pretreatment unit, then forms a reaction solution with a stable water-organic solvent interface, passes through the reaction unit to generate 2,5-diformylfuran, 2,5-furandicarboxylic acid and intermediate oxidation products, and then enters the separation unit to achieve the separation of an organic solvent from an aqueous phase, and the separation of 2,5-diformylfuran from the organic solvent in sequence, wherein the organic solvent contains 2,5-diformylfuran and the aqueous phase contains an amphiphilic catalyst, 2,5-furandicarboxylic acid and the intermediate oxidation products;
• the separated aqueous phase reenters the reaction unit through the recycling unit until the intermediate oxidation products are completely oxidized to 2,5-furandicarboxylic acid, and subsequently, the separation of the amphiphilic catalyst from the aqueous phase, and the separation of 2,5-furandicarboxylic acid from the aqueous phase are achieved in the separation unit;
• the separated organic solvent can pass through the recycling unit for a next reaction and is recovered after the reaction is completed;
• finally, the organic solvent, 2,5-diformylfuran, 2,5-furandicarboxylic acid and the amphiphilic catalyst are obtained in the recovery unit;
• the method comprises:
• preparing the reaction solution with a stable water-organic solvent interface;
• specifically:
• 1step .1:
• preparing a surface-modified carbon nanotube;
• 1step .2:
• preparing the amphiphilic catalyst;
• 1-2step 1.2.1:
• adding the surface-modified carbon nanotube to a metal salt solution, performing ultrasonic treatment and stirring to obtain a mixed solution;
• 1-2step 1.2.2:
• drying the mixed solution to obtain solid powder, placing the solid powder into a hydrogen atmosphere and reducing at 100-400 oC for 1-4 h to obtain the amphiphilic catalyst;
• 1step .3:
• building a stable water-organic solvent interface;
• at room temperature, adding a mixture of 5-hydroxymethylfurfural, the amphiphilic catalyst obtained in step 1.2, water and the organic solvent to the feedstock pretreatment unit and processing for 2-10 min to obtain the reaction solution with the stable water-organic solvent interface;
• a solvent in the metal salt solution is one of water, toluene and cyclohexane, and a solute is metal salt;
• the organic solvent is one of toluene, paraxylene, cyclohexane, n-hexane and ethyl acetate.