Assessment of ion exchange resins as catalysts for the direct transformation of fructose into butyl levulinate

The transformation of fructose into butyl levulinate in aqueous 1-butanol (initial molar ratio 1-butanol/fructose 79, and butanol/water 1.19) has been studied in a discontinuous reactor at 80 120 degrees C and 2.0 MPa over 8 sulfonic polystyrene-DVB ion exchange resins as catalysts (catalyst loading 0.85-3.4 %). Resins swell greatly in the reaction medium and the reaction takes place mainly in the swollen gel-phase. Swollen resins in water have been characterized by analysis of ISEC data, and spaces originated in the gel phase upon swelling are described in terms of zones of different polymer density. A relationship has been found between the morphology of swollen resins and ester production. Swollen resins with low polymer density show the highest butyl levulinate yield. Dowex 50Wx2 was the most effective because it creates the largest and widest spaces in the gel-phase when swelling. Consequently, it better accommodates the proton-transfer-reaction mechanisms.

Automated summary

The study revealed a correlation between the morphology of swollen resins and ester production, with swollen resins of lower polymer density showing the highest butyl levulinate yield. Dowex 50Wx2 was identified as the most effective catalyst due to its ability to create large and wide spaces in the gel-phase while swelling, accommodating proton-transfer-reaction mechanisms more effectively.