Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: 5/14/2013
Publication Date: 8/13/2014
Citation: Qureshi, N. 2014. Integrated bioprocessing and simultaneous product recovery for butanol production. In: Qureshi, N., Hodge, D., Vertes, A., editors. Biorefineries: Integrated Biochemical Processes for Liquid Biofuels. Amsterdam, The Netherlands: Elsevier. p. 205-224.
Technical Abstract: This chapter describes process integration for butanol fermentation and simultaneous recovery. In the control non-integrated butanol fermentation, the concentration of this biofuel in excess to 30 g/L is rarely achieved due to its toxic nature. Such a low butanol concentration results in low reactor productivities usually of the order of 0.30 g/L.h or less and low acetone butanol ethanol (ABE) yield resulting in uneconomic process. Hence, use of alternative product recovery techniques has been applied to remove butanol from fermentation broth as it is produced in the system and never allowing it to reach a toxic level. Using these techniques ABE in excess of 461 to 690 g/L has been produced from glucose. These product recovery techniques include adsorption, liquid liquid extraction, perstraction, pervaporation, gas stripping, vacuum fermentation and reverse osmosis. Application of high productivity (up to 5.0 g/L.h) reactors and combined use of simultaneous product removal techniques resulted in integrated processes that could be commercialized for this fermentation. Some of the product recovery techniques have been studied for butanol production from whey permeate and agricultural residues thus combining simultaneous hydrolysis, fermentation, and recovery (SSFR). The reader is informed that butanol producing cultures can hydrolyze lactose present in whey permeate during fermentation and recovery processes. However, for hydrolysis of agricultural residues, hydrolytic enzymes are added to the system, though hydrolysis, fermentation, and recovery can be performed in one system.