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Progress in Chemistry 2005, Vol. 17 Issue (05): 793-799 Previous Articles   Next Articles

• Review •

Separation of Organics from Ionic Liquids Using Supercritical Fluids and Phase Behaviors of These Systems

Fu Dongbao;Zhao Suoqi**;Pu Jinjun;Sun Xuewen   

  1. State Key Laboratory of Heavy Oil, China University of Petroleum(Beijing),Beijing 102249,China
  • Received: Revised: Online: Published:
  • Contact: Zhao Suoqi
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Ionic liquids hold great potential as replacements for traditional volatile organic solvents due to iheir unique characteristics. However, the separation and recovery of ionic liquids from process streams is a major challenge for the development of industrial processes that will use these interesting new solvents. Distillation, liquid-liquid extraction and supercritical fluid extraction are known feasible separation methods. Among the rest, supercritical fluid extraction can be used to separate both volatile and relatively non-volatile organic compounds from ionic liquids without cross-contamina-tion between phases. The latest progress in the separation methods is reviewed from the aspects of phase behavior of bina-ry system, phase behavior of ternary system, modeling and experimental results of supercritical fluid extraction. A new idea is put forward that supercritical propane could be an alternative for supercritical carbon dioxide. The future research and the industrialization prospect of the technology are also approached.
Key words: ionic liquids, supercritical fluids, phase behaviors, extraction, organics

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