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Ethylene Carbonate used as Reagent and Green Solvent in the Chemical Modification of Corncob

2015; Wiley; Volume: 300; Issue: 8 Linguagem: Inglês

10.1002/mame.201500001

1439-2054

Adriana Chamú‐Muñoz, Oscar Hernández‐Meléndez, Martín G. Hernández-Luna, Jorge Alcaraz‐Cienfuegos, Eduardo Vivaldo‐Lima, Eduardo Bárzana,

Lignin and Wood Chemistry

Ethylene carbonate (EC) is selected as reagent and green solvent for the modification of corncob (CC), a lignocellulosic residue obtained from wet or dry milling processes during industrial and food applications of corn grains, as well as from ethanol production plants, using the following three reaction systems: (i) liquid phase (LP) and LP‐pressurized at moderate temperatures (85–175°C); (ii) solid phase at low temperatures (65–85 °C); and (iii) vapor phase at moderate temperatures (120–160 °C). Both the LP and LP‐pressurized systems allow the incorporation of large amounts of EC units. LP‐pressurized systems promote faster CC modification (25–35 min) at 165 °C and reduced consumption of EC monomer. CC modification in solid phase promotes moderate incorporation of EC units at low temperatures (60–80 °C) using K 2 CO 3 as catalyst. CC modification in the vapor phase system is acceptable, efficient, and shows low monomer consumption.