Recovery of fermentation salts from dilute aqueous solutions
Abstract
Dilute solutions of fermentation sales may be concentrated by extracting water using low-miscibility, low-molecular-weight secondary and tertiary amines, e.g. triethylamine (TEA), diisopropyl amine (DIA), N,N-diethylmethylamine (DEMA), and mixtures thereof. At 30° C.-55° C., which corresponds to typical fermentation temperatures, these low-molecular-weight amines or their mixtures, can extract large amounts of water from dilute aqueous solutions containing fermentation salts. Thus, dilute fermentation salt solutions can be concentrated by selectively removing water. At these low temperatures, the amine phase contains 20-35% water and a much reduced quantity of fermentation salt. When the temperature is raised, water phases out of the amine, allowing the amine to be recycled and reused to extract additional water. Using this approach, about 82.5% of water can be removed from a 3% dilute solution using conventional multistage, countercurrent extraction, thus providing a 15% concentrated fermentation salt solution.
Subject
210/634210/195.1
210/255
210/511
210/521
210/802
210/805
B01D 11/0457
B01D 17/041
B01D 17/044
B01D 17/0214
C07C 51/48
B01D 17/00
B01D 17/045
B01D 17/042
B01D 17/0211
B01D 17/048
B01D 17/047
C07C 53/08
Collections
Citation
Holtzapple, Mark T.; Davison, Richard R.; Luettich, Torsten (2002). Recovery of fermentation salts from dilute aqueous solutions. United States. Patent and Trademark Office; Texas A&M University. Libraries. Available electronically from https : / /hdl .handle .net /1969 .1 /176713.