Microwave radiation-assisted synthesis of levulinic acid from microcrystalline cellulose: Application to a melon rind residue

Microwave radiation-assisted synthesis of levulinic acid from microcrystalline cellulose : Application to a melon rind residue

The circular economy considers waste to be a new raw material for the development of value-added products. In this context, agroindustrial lignocellulosic waste represents an outstanding source of new materials and platform chemicals, such as levulinic acid (LA). Herein we study the microwave (MW)-assisted acidic conversion of microcrystalline cellulose (MCC) into LA. The influence of acidic catalysts, inorganic salt addition and ball -milling pre-treatment of MCC on LA yield was assessed. Depolymerization and disruption of cellulose was monitored by FTIR, TGA and SEM, whereas the products formed were analyzed by HPLC and NMR spectroscopy. The parameters that afforded the highest LA yield (48 %, 100 % selectivity) were: ball-milling pre-treatment of MCC for 16 min at 600 rpm, followed by MW-assisted thermochemical treatment for 20 min at 190 degrees C, aqueous p-toluenesulfonic acid (p-TSA) 0.25 M as catalyst and saturation with KBr. These optimal conditions were further applied to a lignocellulosic feedstock, namely melon rind, to afford a 51 % yield of LA. These results corroborate the suitability of this method to obtain LA from agroindustrial wastes, in line with a circular economy-based approach.

Huertas Alonso, Alberto José,1988-Stockholms universitet,Institutionen för organisk kemi,Institutionen för material- och miljökemi (MMK),Universidad de Castilla La Mancha, Ciudad Real, Spain(Swepub:su)aljo5482 (author)
Salgado-Ramos, Manuel (author)
Gonzalez-Serrano, Diego J. (author)
Sanchez-Verdu, M. Prado (author)
Cabanas, Beatriz (author)
Hadidi, Milad (author)
Moreno, Andres (author)
Stockholms universitetInstitutionen för organisk kemi (creator_code:org_t)

In:International Journal of Biological Macromolecules: Elsevier BV2370141-81301879-0003

By the author/editor: Lorente, Almuden ...; Huertas Alonso, ...; Salgado-Ramos, M ...; Gonzalez-Serrano ...; Sanchez-Verdu, M ...; Cabanas, Beatriz; show more...; Hadidi, Milad; Moreno, Andres; show less...

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