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Título
Integrated Renewable Production of ETBE from Switchgrass
Autor(es)
Palabras clave
Energy
Biofuels
i-Butene
Mathematical optimization
Ethanol
Switchgrass
Clasificación UNESCO
3303 Ingeniería y Tecnología Químicas
3310.05 Ingeniería de Procesos
Fecha de publicación
2019
Citación
Galán, G., Martín, M., Grossmann, I.E. (2019). Integrated Renewable production of ETBE from Switchgrass. ACS Sust. Chem Eng. 10.1021/acssuschemeng.9b01004
Resumen
[EN]In this work, we propose the optimization of a flowsheet for the conceptual design of an integrated renewable
production of ETBE from ethanol and i-butene from switchgrass. A superstructure embedding a number of alternatives is
proposed. Two technologies are considered for switchgrass pretreatment, dilute acid and a novel ammonia fiber explosion
(AFEX), so that the structure of the grass is broken down. Only glucose is fermented to produce i-butene, while xylose is
fermented to ethanol. Ethanol is purified using a multieffect column followed by molecular sieves and a PSA-membrane system
is used to upgrade the i-butene. The problem is formulated as an MINLP, and solved for each pretreatment as an NLP. Finally,
an economic evaluation is performed including a sensitivity analysis. Biomass composition determines the byproduct obtained.
Dilute acid is the selected pretreatment due to the largest yield to sugars and the possibility of adjusting the production of both
i-butene and ethanol for the needs to ETBE. For a facility that produces 90 kt/yr of ETBE, the investment adds up to 160 M€
for a production cost of 0.61€/kg, which is above market price. Even though the results look promising, further experimental
and scale up studies are required for validation.
URI
ISSN
2168-0485
Collections
- PSEM3. Artículos [39]