title: Butanol production from concentrated lactose/whey permeate: use of pervaporation membrane to recover and concentrate product.
abstract: In these studies, butanol (acetone butanol ethanol or ABE) was produced from concentrated lactose/whey permeate containing 211 g L(-1) lactose. Fermentation of such a highly concentrated lactose solution was possible due to simultaneous product removal using a pervaporation membrane. In this system, a productivity of 0.43 g L(-1) h(-1) was obtained which is 307 % of that achieved in a non-product removal batch reactor (0.14 g L(-1) h(-1)) where approximately 60 g L(-1) whey permeate lactose was fermented. The productivity obtained in this system is much higher than that achieved in other product removal systems (perstraction 0.21 g L(-1) h(-1) and gas stripping 0.32 g L(-1) h(-1)). This membrane was also used to concentrate butanol from approximately 2.50 g L(-1) in the reactor to 755 g L(-1). Using this membrane, ABE selectivities and fluxes of 24.4-44.3 and 0.57-4.05 g m(-2) h(-1) were obtained, respectively. Pervaporation restricts removal of water from the reaction mixture thus requiring significantly less energy for product recovery when compared to gas stripping.
authors.affiliation: United States Department of Agriculture (USDA), Agricultural Research Service (ARS), National Center for Agricultural Utilization Research (NCAUR), 1815 N University Street, Peoria, IL, 61604, USA, Nasib.Qureshi@ars.usda.gov.
authors.forename: N
authors.initials: N
authors.lastname: Qureshi
authors.forename: A
authors.initials: A
authors.lastname: Friedl
authors.forename: I S
authors.initials: IS
authors.lastname: Maddox
mesh_terms: D000818:Animals; D000440:Butanols / Q000302:isolation & purification* / Q000378:metabolism*; D005285:Fermentation; D007785:Lactose / Q000378:metabolism*; D008566:Membranes; D008892:Milk / Q000378:metabolism*; D009330:Nebulizers and Vaporizers
chemical_list: D000440:Butanols; D007785:Lactose