Abstract
We performed the synergistic extraction of lactic acid with tri- n -butylphosphate (TBP) and alkylamines to find an optimum synergistic extraction system. We examined 12 alkylamines as co-extractants and found that extractability with alkylamines increases in order from tertiary>secondary>primary. Extractability increased with increasing alkyl chain length in trialkylamine; tri- n -octylamine (TOA) enabled the best extractability, however, further increases in chain length resulted in a decrease in extractability. The diluent effect was small due to a high concentration of TBP. We found that the synergistic extractions of lactic and succinic acids with TOA and TBP are exothermic processes.
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