Optimal bioreactor operational policies for the enzymatic hydrolysis of sugarcane bagasse
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Data
2013
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Resumo
The consolidation of the industrial production of
second-generation (2G) bioethanol relies on the improvement
of the economics of the process. Within this general scope,
this paper addresses one aspect that impacts the costs of the
biochemical route for producing 2G bioethanol: defining optimal
operational policies for the reactor running the enzymatic
hydrolysis of the C6 biomass fraction. The use of fed-batch
reactors is one common choice for this process, aiming at
maximum yields and productivities. The optimization problem
for fed-batch reactors usually consists in determining
substrate feeding profiles, in order to maximize some performance
index. In the present control problem, the performance
index and the system dynamics are both linear with respect to
the control variable (the trajectory of substrate feed flow).
Simple Michaelis–Menten pseudo-homogeneous kinetic
models with product inhibition were used in the dynamic
modeling of a fed-bath reactor, and two feeding policies were
implemented and validated in bench-scale reactors processing
pre-treated sugarcane bagasse. The first approach applied
classical optimal control theory. The second policy was defined
with the purpose of sustaining high rates of glucose
production, adding enzyme (Accellerase® 1500) and substrate
simultaneously during the reaction course. A methodology is
described, which used economical criteria for comparing the
performance of the reactor operating in successive batches and
in fed-batch modes. Fed-batch mode was less sensitive to
enzyme prices than successive batches. Process intensification in the fed-batch reactor led to glucose final concentrations
around 200 g/L.
Descrição
Palavras-chave
Enzymatic hydrolysis, Bioreactor, Fed batch, Cellulose, Bagasse, Sugarcane
Citação
MONTANO, Inti Doraci Cavalcanti et al. Optimal bioreactor operational policies for the enzymatic hydrolysis of sugarcane bagasse. Bioenerg Research, New York, v. 6, p. 1-785, 2013.