Submitted to: Elsevier
Publication Type: Book / Chapter
Publication Acceptance Date: 4/15/2013
Publication Date: 8/13/2014
Citation: Qureshi, N. 2014. Consolidated processes for product recovery. In: Qureshi, N., Hodge, D., Vertes, A., editors. Biorefineries: Integrated Biochemical Processes for Liquid Biofuels. Amsterdam, The Netherlands: Elsevier. p. 141-160.
Technical Abstract: Currently, fermentation industries are structured on individual unit operations for production of biofuels such as ethanol, butanol, and 2,3-butanediol which result in increased capital and operational costs. Such increased costs result in low profitability and increased consumer price. With the development of novel technologies, it is possible that these unit operations be combined/consolidated or integrated thus reducing overall operation costs. This chapter discusses potential of various product recovery technologies that can be carried at fermentation temperature as opposed to distillative recovery of biofuels thus opening avenues for combined fermentation and recovery. The technologies that have been developed include adsorption, liquid-liquid extraction, perstraction, pervaporation, gas stripping, vacuum fermentation, salt induced phase separation, and ionic liquid separation. The use of economically available feedstocks such as cellulosic wastes as compared to sugarcane juice, molasses, or corn/corn starch is also briefly presented. The cost of agricultural residues is about $60/ton as opposed to corn at $275/ton. However, these residues require hydrolysis prior to fermentation and recovery. It is proposed that simultaneous hydrolysis, fermentation, and recovery be carried out using one of the product separation techniques.