| 主权项 |
1. 2.5-FURANDICARBOXYLIC ACID INTEGRATED PRODUCTION PROCESS comprising the following steps:
a) introducing a feed stream comprising a carbohydrate-containing aqueous solution at concentrations ranging from 1% to 50% in a reactor operating at temperatures of 150 oC to 300 oC, under pressures of 300 psia to 1,800 psia, at spatial velocities of 0.20 to 4h-1, in order to promote a carbohydrate dehydration reaction and formation of 5-HMF, with selectivity greater than 60% mole/mole; b) filter the 5-HMF-rich stream obtained in order to remove humins and salts, byproducts generated during the feed dehydration; c) adjust the pH of the 5-HMF-rich stream that has already been filtered to values between 6.5 and 7.5; d) have the pH-adjusted, 5-HMF-rich stream that has already been filtered come into contact with an acidic ion-exchange resin that has been previously exchanged with cations such as Na+, K+, Ca2+ (preferably) or other cations, in order to obtain two streams: a first stream containing 5-HMF at concentrations greater than 90%, and a second stream containing unreacted carbohydrates; e) direct the stream containing unreacted carbohydrates to the dehydration reactor from item a); f) adjust the pH of the 5-HMF-containing stream to values between 6.5 and 14; g) have the pH-adjusted, 5-HMF-containing stream come into contact with an oxygen-rich stream in a fixed-bed reactor, wherein the catalyst is a heterogeneous supported metal catalyst or even a mass metal catalyst, in order to obtain conversions of 5-HMF into 2.5 FDCA greater than 90% mole/mole; h) recover the 2.5-FDCA produced in g) using precipitation followed by filtration. |
