Abstract
Acetone, butanol, and ethanol (ABE) is an alternative biofuel. However, the energy requirement of ABE recovery by distillation is considered elevated (> 15.2 MJ fuel/Kg-ABE), due to the low concentration of ABE from fermentation broths (between 15 and 30 g/l). In this work, to reduce the energy requirements of ABE recovery, four processes of heat-integrated distillation were proposed. The energy requirements and economic evaluations were performed using the fermentation broths of several biocatalysts. Energy requirements of the processes with four distillation columns and three distillation columns were similar (between 7.7 and 11.7 MJ fuel/kg-ABE). Double-effect system (DED) with four columns was the most economical process (0.12–0.16 $/kg-ABE). ABE recovery from dilute solutions by DED achieved energy requirements between 6.1 and 8.7 MJ fuel/kg-ABE. Vapor compression distillation (VCD) reached the lowest energy consumptions (between 4.7 and 7.3 MJ fuel/kg-ABE). Energy requirements for ABE recovery DED and VCD were lower than that for integrated reactors. The energy requirements of ABE production were between 1.3- and 2.0-fold higher than that for alternative biofuels (ethanol or isobutanol). However, the energy efficiency of ABE production was equivalent than that for ethanol and isobutanol (between 0.71 and 0.76) because of hydrogen production in ABE fermentation.
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Abbreviations
- ABE:
-
Acetone, butanol, and ethanol
- DE:
-
Double-effect
- FABE :
-
Production flow of ABE (kg/h)
- HS :
-
Energy consumption of the separation (MJ/kg-ABE)
- IRC:
-
Investment cost of recovery ($/kg-ABE)
- LHV:
-
Lower heating value of solvents (MJ/kg-ABE)
- M&S:
-
Marshall and Swift equipment cost index
- ORC:
-
Operational cost of recovery ($/kg-ABE)
- Rs:
-
The ABE yield (g-ABE/g-substrate)
- TRC:
-
Total recovery cost ($/kg-ABE)
- TIC:
-
The total investment cost ($)
- TOAC:
-
The total operational annualized cost ($/year)
- tri :
-
Payback period (year)
- ta :
-
Annual operation time (h)
- VC:
-
Vapor compression
- VLE:
-
Vapor–liquid equilibrium
- 3DC:
-
Three distillation columns
- 3DC-VC:
-
Three distillation columns with vapor compression
- 4DC:
-
Three distillation columns
- 4DC-DE:
-
Four distillation columns with double-effect
- 5DC:
-
Five distillation columns
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The authors thank Colombian Administrative Department of Science, Technology, and Innovation (COLCIENCIAS) for the financial support that made this work possible.
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Grisales Diaz, V.H., Olivar Tost, G. Energy efficiency of acetone, butanol, and ethanol (ABE) recovery by heat-integrated distillation. Bioprocess Biosyst Eng 41, 395–405 (2018). https://doi.org/10.1007/s00449-017-1874-z
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DOI: https://doi.org/10.1007/s00449-017-1874-z