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Energy, exergy and techno-economic analysis for biobutanol production: a multi-objective optimization approach based on economic and environmental criteria

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Abstract

Currently, butanol obtained by fermentation is considered as potential biofuel. In this work, it has been simulated and optimized a process to produce acetone, butanol and ethanol by means of lignocellulosic material. To accomplish this task, initially, it was planned the raw material selection, followed by the simulation in MATLAB of simultaneous saccharification, fermentation and separation reactor (SFS) and finally, the stream coming from fermentation was purified. The separation stage was selected from three different options to purify that effluent. The entire process was evaluated under a robust optimization process considering environmental, economic and energetic objective functions by means of a hybrid stochastic method, differential evolution with tabu list. The obtained results showed that the best scheme to produce and purify butanol was the SFS-3C, which considers thermally coupled columns to purify acetone, butanol and ethanol. In general terms, it was obtained as result 0.138 $/kgbutanol, 0.132 points/kgbutanol and 66.8 regarding to the total annual cost, environmental impact and exergy efficiency, respectively.

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Abbreviations

ABE:

Acetone–butanol–ethanol

C TM :

Capital cost of the plant

C ut :

Utility costs

DDE:

Dynamic data exchange

DE:

Differential evolution

DETL:

Differential evolution with tabu list

D cn :

Column diameter

F ext :

Extractant flow

F rn :

Distillate fluxes

TAC:

Total annual cost

LLE:

Liquid–liquid extraction

LCA:

Life cycle assessment

N tn :

Total column stages

N fn :

Feed stages

ROI:

Return of investment

SFS:

Integrated reactor saccharification–fermentation with simultaneous recovery

R rn :

Reflux ratio

TAC:

Total annual cost

TL:

Tabu list

x m :

Vectors of required purities

y m :

Vectors of obtained purities

F :

Mass flow

V :

Volume

S :

Substrate

x :

Molar fraction

C :

Amount of mass in the reactor

GEI99:

Global ecoindicator 99

NEB:

Net energy balance

η :

Exergy efficiency

NPV:

Net present value

IES:

Ideal energy efficiency of separation

A :

Raw material

X :

Amount of biomass used

D :

Dilution rate

ENZ:

Amount of enzyme

N fni :

Feed stage

F rni :

Flow of interconnection

MODE-TL:

Multi-objetive differential evolution with tabu list

R s :

Yield for butanol fermentation

LHV:

Lower heating value of butanol

H s :

Energy consumption for purification

PUb :

Quantity of each raw material

RMUb :

Unitary ecoindicator of raw material

EI99PUR:

Ecoindicator of purification stage

β b :

Amount of chemical released per unit of reference flow

α b,k :

Damage caused in category

ω d :

Weighting factor for damage in category

δ d :

Normalization factor for damage

EI99RM:

Ecoindicator 99 of total raw material used

C GR :

Total grassroots costs

\(C_{{{\text{BM}},i}}^{\text{}}\) :

Module cost of the equipment

C BM, i :

Module cost of the equipment considers real operation

C R :

Reactor cost

C T :

Column cost

C IN :

Condenser cost

C IE :

Initial investment

C E :

Electricity cost

C V :

Steam cost

C AE :

Cooling water cost

C S :

Substrate cost

C ENZ :

Enzyme cost

C Ex :

Cost due to extractant lost

NEB:

Net energy balance

LHV:

Lower heating value

IES:

Ideal energy efficiency of separation

R s :

Yield ABE

H s :

Energy consumption for purification

NEt :

Net earnings value

FTDCt :

Depreciable capital investment

φ :

Net earnings after tax rate

Revt :

Revenues

FOCt :

Facility operating

TOCt :

Transportation

E x,ABE :

Exergy of produced ABE (MW)

E x,biomass :

Exergy of biomass (MW)

E x,heating :

Exergy of heating (MW)

E x,reactor :

Exergy of reactor (MW)

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Acknowledgements

The financial support provided by the Universidad de Guanajuato and CONACyT (México) is gratefully acknowledged.

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Correspondence to Juan José Quiroz-Ramírez.

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Quiroz-Ramírez, J.J., Sánchez-Ramírez, E. & Segovia-Hernández, J.G. Energy, exergy and techno-economic analysis for biobutanol production: a multi-objective optimization approach based on economic and environmental criteria. Clean Techn Environ Policy 20, 1663–1684 (2018). https://doi.org/10.1007/s10098-018-1486-6

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  • DOI: https://doi.org/10.1007/s10098-018-1486-6

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