on the difference between the physical or chemical properties of the various alcohols
and water, or their interaction with an auxiliary agent or material.
Enrichment of the end product varies depending on the selection criteria of the
ISPR (in situ process removal) methodology but methods with lower separation
factors may still attain a similar or higher concentration of the product in the
concentration when operated at higher residual product concentrations. Consequently, the concentration of the concentrates is closely related to the concentration
of the product in the fermentation broth.
It can be beneficial in different ways, such as enriching the end product concentration contributing to lower downstream prices, enhancing productivity by removing the inhibition stock, decreasing stream flows as it hits higher product
concentrations and thereby raising product yield, decreasing side reactions by
removing the product.
1.2.2.2 Vacuum Fermentation
Cysewski and Wilke (1977) first introduced this technique to reduce the inhibitory
effect of ethanol throughout the fermentation progression. They demonstrated that
rapid and whole fermentation was possible with condensed sugar media by holding
the bioreactor below inert atmosphere, throughout the vacuum fermentation route,
bioethanol is continually extracted through fermentation broth by applying vacuum
pressure beneath the fermenter to enable ethanol to fade at fermentation temperature
and consequently to be condensed utilizing condensation cooling or chilling water.
Ethanol concentration can be regulated at low levels during the vacuum fermentation
phase, reducing or decreasing the inhibitory effect of ethanol on the breakdown of
the leaves and the fermentation method. A few reviews of recent researches are
discussed in Table 1.5.
1.2.3 Comparison of Various Biofuels Recovery Techniques
on the Basis of Economics
Reliable downstream processing of broth for fermentation biofuels is usually a tradeoff between rate of recovery, cost, and durability of the device. In relation to
overhead, an appropriate strategy for the recovery of biofuels should be economically viable and implemented into the industrial scale (Fig. 1.8). Vane (2008) have
carried out a detailed economic study of various energy-consuming ethanol recovery
techniques. Operating costs during ethanol processing depend on the decisions made
about the cost of feedstock, the cost of enzymes, and the kind of pretreatment to be
used. Therefore, merely performing an analysis in terms of energy consumption is
not enough. Hence, more factors such as infrastructure and operating expenses, for
efficient downstream processing, must also be included.
16
A. Shrivastava et al.
and water, or their interaction with an auxiliary agent or material.
Enrichment of the end product varies depending on the selection criteria of the
ISPR (in situ process removal) methodology but methods with lower separation
factors may still attain a similar or higher concentration of the product in the
concentration when operated at higher residual product concentrations. Consequently, the concentration of the concentrates is closely related to the concentration
of the product in the fermentation broth.
It can be beneficial in different ways, such as enriching the end product concentration contributing to lower downstream prices, enhancing productivity by removing the inhibition stock, decreasing stream flows as it hits higher product
concentrations and thereby raising product yield, decreasing side reactions by
removing the product.
1.2.2.2 Vacuum Fermentation
Cysewski and Wilke (1977) first introduced this technique to reduce the inhibitory
effect of ethanol throughout the fermentation progression. They demonstrated that
rapid and whole fermentation was possible with condensed sugar media by holding
the bioreactor below inert atmosphere, throughout the vacuum fermentation route,
bioethanol is continually extracted through fermentation broth by applying vacuum
pressure beneath the fermenter to enable ethanol to fade at fermentation temperature
and consequently to be condensed utilizing condensation cooling or chilling water.
Ethanol concentration can be regulated at low levels during the vacuum fermentation
phase, reducing or decreasing the inhibitory effect of ethanol on the breakdown of
the leaves and the fermentation method. A few reviews of recent researches are
discussed in Table 1.5.
1.2.3 Comparison of Various Biofuels Recovery Techniques
on the Basis of Economics
Reliable downstream processing of broth for fermentation biofuels is usually a tradeoff between rate of recovery, cost, and durability of the device. In relation to
overhead, an appropriate strategy for the recovery of biofuels should be economically viable and implemented into the industrial scale (Fig. 1.8). Vane (2008) have
carried out a detailed economic study of various energy-consuming ethanol recovery
techniques. Operating costs during ethanol processing depend on the decisions made
about the cost of feedstock, the cost of enzymes, and the kind of pretreatment to be
used. Therefore, merely performing an analysis in terms of energy consumption is
not enough. Hence, more factors such as infrastructure and operating expenses, for
efficient downstream processing, must also be included.
16
A. Shrivastava et al.