Aqueous Two Phase Extraction for the Recovery of 1,3-Propanediol from Its Aqueous Solutions

Min Hee Chung, Yeon Ki Hong, Hyoung Wook Lee, Sung-Jun Park

Department of Chemical and Biological Engineering Korea National University of Transportation Chungju, Chungbuk 380-702 Korea.
Department of Energy System Engineering.
Department of Mechanical Engineering Korea National University of Transportation Chungju, Chungbuk 380-702 Korea.

DOI: 10.4236/ampc.2012.24B040                

Abstract

As the biodiesel production is rapidly enhanced, the crude glycerol, which is by-product of biodiesel processes, is state of surplus. 1,3-PDO (1,3-propanediol), a valuable monomer of poly(trimethylene terephthalate) (PTT), can be produced from the fermentation process using crude glycerin as a carbon source. For the economic biological production of 1,3-PDO, the low cost and high efficient separation processes is essential. In this study, aqueous two-phase system composed of various hydrophilic alcohols and salt was used as a primary separation step for 1,3-PDO. It was found that the aqueous two-phase systems are easily formed with decreasing of the polarity of alcohols. The extraction efficiency is proportional to the polarity of alcohols. In case of methanol or ethanol/K2HPO4, the extraction efficiency was more than 90%.  It was concluded that the aqueous two-phase extraction using methanol or ethanol/K2HPO4 can be applied  for the primary separation of 1,3-PDO  as an alternative to a conventional primary separation processes.

Keywords

1, 3-Propanediol; Alcohols; Phase Separation; Extraction Efficiency

Conflicts of Interest

The authors declare no conflicts of interest.

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