Swing processes for solvent regeneration in liquid-liquid extraction of succinic acid

Lisette Maria Johanna Sprakel, A.F.M. Holtkamp, R. Bassa, B. Schuur*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
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Abstract

Solvent regeneration processes for liquid-liquid extraction of succinic acid (HSuc) from aqueous streams were investigated. Tri-n-octyl amine (TOA) and tri-n-octyl phosphine oxide (TOPO) in methyl isobutyl ketone (MIBK) showed good extraction. For 20 wt% TOA in MIBK, addition of pentane at anti-solvent-to-solvent ratio of 1 (vol/vol) decreased KD from 10.2 to 0.46, applying ethane at 30 bar decreased KD to 0.45 and increasing the temperature to 60 °C decreased KD to 1.6. Evaporation of MIBK from a solvent of 40 wt% TOA in MIBK decreased KD from 10.2 to 4.0. For these processes, capital investments and energy requirements were calculated for 10 kiloton per year at a concentration factor of 5. Costs of all processes to obtain the product at maximum solubility are less than evaporation (2600 kJ/kg product at maximum solubility). A combination of a swing in diluent and temperature results in higher product concentrations after back-extraction, and reduced the energy input to obtain the pure HSuc to 19 MJ/kg. The ethane-based process is most effective with 13 MJ/kg to obtain the pure HSuc product. Although additional capital investments for compressors and pumps are required, only 110 days of production are required for return on investments.

Original languageEnglish
Article number107600
JournalChemical Engineering and Processing - Process Intensification
Volume143
DOIs
Publication statusPublished - 1 Sep 2019

Keywords

  • Diluent-swing
  • Liquid-liquid extraction (LLX)
  • Pressure-swing
  • Solvent regeneration

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