Direct Capture of Organic Acids From Fermentation Media Using Ionic Liquids

Klasson, K.T.

Oak Ridge National Laboratory

关键词: Succinic Acid;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Viscosity;    Aqueous Solutions;    Solvents;   

DOI  :  10.2172/861707
RP-ID  :  ORNL/TM-2004/192
RP-ID  :  DE-AC05-00OR22725
RP-ID  :  861707

美国|英语

来源: UNT Digital Library

【 摘 要 】

Several ionic liquids have been investigated for the extraction of organic acids from fermentation broth. Partitioning of representative organic acids (lactic, acetic, and succinic) between aqueous solution and nine hydrophobic ionic liquids was measured. The extraction efficiencies were strongly dependent on pH of the aqueous phase. Distribution coefficient was very good (approximately 60) at low succinic acid concentrations for one of the ionic liquids (trihexyltetradecylphosphonium methanesulfonate) at neutral pH. However, this ionic liquid had to be diluted with nonanol due to its high viscosity in order to be useful. A diluent (trioctylamine) was also added to this mixture. The results suggest that an extraction system based on ionic liquids may be feasible for succinic acid recovery from fermentation broth and that two ideal extraction stages are needed to reduce the concentration from 33 g/L to 1 g/L of succinic acid. Further studies are needed to evaluate other issues related to practical applications, including ionic liquid loss in the process, toxicity effects of ionic liquids during simultaneous fermentation and extractions.