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Type: Artigo
Title: Resolving mismatches in the flexible production of ethanol and butanol from eucalyptus wood with vacuum fermentation
Author: Assumpção, Daniel de Castro
Rivera, Elmer Alberto Ccopa
Tovar, Laura Plazas
Ezeji, Thaddeus Chukwuemeka
Maciel Filho, Rubens
Mariano, Adriano Pinto
Abstract: In flexible ethanol-butanol plants, low tolerance to butanol by solventogenic clostridia (and resulting dilute fermentation) results in considerable number of empty fermentors whenever production focuses on ethanol. This research identified scenarios in which vacuum fermentation (in-situ vacuum recovery) may be applied to solve this problem. We conducted ethanol (Saccharomyces cerevisiae) and ABE (Clostridium beijerinckii NCIMB 8052) batch vacuum fermentations of eucalyptus hydrolysates according to the distribution of sugars in a flexible plant. Based on the experiments and performance targets set for the ABE fermentation, we simulated a flexible plant that processes 1000 dry t eucalyptus/day using pretreatment and enzymatic hydrolysis steps with moderate solids loading (15% w/w). The simulation showed that the number of fermentation tanks can decrease by 62% (eliminating 10 idle tanks, 3748 m3 each) by applying vacuum recovery only to the fermentation of mixed (cellulose + hemicellulose) hydrolysates to ABE. We concluded that this configuration can result in savings of up to 2 MMUS$/year in comparison with flexible plants having only conventional batch fermentors, and additional cost savings are expected from reduced wastewater footprint
Subject: Eucalipto
Country: Alemanha
Editor: Springer
Rights: Fechado
Identifier DOI: 10.1007/s00449-018-1990-4
Date Issue: 2018
Appears in Collections:FEQ - Artigos e Outros Documentos

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