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Process for producing fuel using two fermentations

  • US 10,202,622 B2
  • Filed: 07/22/2015
  • Issued: 02/12/2019
  • Est. Priority Date: 07/22/2014
  • Status: Active Grant
First Claim
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1. A process for producing a fermentation product comprising:

  • introducing a first substrate to a first fermentation unit to produce a first fermentation product, the first substrate comprising at least one compound selected from the group consisting of carbon monoxide, carbon dioxide, and hydrogen;

    introducing a second substrate to a second fermentation unit to produce a second fermentation product, the second substrate comprising at least one carbohydrate derived from organic material in one or more processing steps, the first fermentation product the same as the second fermentation product;

    feeding an aqueous stream comprising the first fermentation product to a stage in the process such that at least a portion of the first fermentation product produced in the first fermentation unit enters the second fermentation unit; and

    recovering at least a portion of the first fermentation product produced in the first fermentation unit and at least a portion of the second fermentation product produced in the second fermentation unit from the effluent of the second fermentation unit to provide the fermentation product.

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