Microwave-assisted conversion of simple sugars and waste coffee grounds into 5-Hydroxymethylfurfural in a highly aqueous DMSO solvent system catalyzed by a combination of Al(NO3)3 and H2SO4

• Main Authors: Ganado, Rey Joseph J., Yu, Derrick Ethelbhert C., Franco, Francisco C., Jr.
• Format: text
• Published: Animo Repository 2019
• Subjects: Fructose; Glucose; Organic solvents; Organic compounds; Dimethyl sulfoxide; Chemistry
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/3640; https://animorepository.dlsu.edu.ph/context/faculty_research/article/4642/type/native/viewcontent/acs.iecr.9b03000
• Institution: De La Salle University

5-Hydroxymethylfurfural (HMF), an organic platform chemical, used as a precursor of various industrial chemicals, was synthesized from waste coffee grounds (WCG), glucose, and fructose, using Al(NO3)3 and H2SO4 as catalysts, in a highly aqueous binary solvent system consisting of water and dimethyl sulfoxide (DMSO) and a conventional microwave as the heating system. The effect of tuning the water/DMSO ratio was first studied. Results showed that the highest HMF yield can be obtained using 6:4, 5:5, and 7:3 water/DMSO ratios for WCG, glucose, and fructose, respectively. A response surface methodology was also employed to determine the interactions among catalyst loading, reaction time, and microwave power and their effects HMF yield. Yields of up to 13.65% (WCG), 28.50% (glucose), and 60.8% (fructose) were observed. This study demonstrates the use of WCG as an HMF precursor and the tuning of several experimental factors to increase the HMF yield from simple sugars and WCG. © 2019 American Chemical Society.