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Recyclable extractant compositions

  • US 9,249,076 B2
  • Filed: 09/20/2013
  • Issued: 02/02/2016
  • Est. Priority Date: 09/21/2012
  • Status: Active Grant
First Claim
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1. A process comprising:

  • (a) providing a fermentation medium comprising a fermentable carbon source, a recombinant microorganism comprising an engineered butanol biosynthetic pathway, and butanol;

    (b) contacting said fermentation medium with an extractant composition comprising an effective amount of antioxidant, whereby at least a portion of the butanol in the fermentation medium partitions into the extractant;

    (c) recovering at least a portion of the butanol and extractant composition from the fermentation medium;

    (d) recycling the extractant composition recovered in (c) one or more times to the fermentation medium; and

    (e) adjusting the effective amount of antioxidant in the extractant composition whereby the rate of oxidation of recycled extractant composition is substantially reduced such that the extractant composition may be recycled as provided in step (d) for at least ten recycles.

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