Applied Biochemistry and Biotechnology

, Volume 173, Issue 2, pp 486–500 | Cite as

Vacuum Stripping of Ethanol during High Solids Fermentation of Corn

  • Jameel K. Shihadeh
  • Haibo Huang
  • Kent D. Rausch
  • Mike E. Tumbleson
  • Vijay Singh
Article

Abstract

In corn-ethanol industry, yeast stress inducing glucose concentrations produced during liquefaction and subsequent high ethanol concentrations produced during fermentation restrict slurry solids to 32 % w/w. These limits were circumvented by combining two novel technologies: (1) granular starch hydrolyzing enzyme (GSHE) to break down starch simultaneously with fermentation and (2) vacuum stripping to remove ethanol. A vacuum stripping system was constructed and applied to fermentations at 30, 40, and 45 % solids. As solids increased from 30 to 40 %, ethanol yield decreased from 0.35 to 0.29 L/kg. Ethanol yield from 45 % solids was only 0.18 L/kg. An improvement was conducted by increasing enzyme dose from 0.25 to 0.75 g/g corn and reducing yeast inoculum by half. After improvement, ethanol yield from 40 % solids vacuum treatment increased to 0.36 L/kg, comparable to ethanol yield from 30 % solids (control).

Keywords

Granular starch hydrolyzing enzyme Vacuum stripping Dry grind ethanol High solids fermentation 

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Jameel K. Shihadeh
    • 1
  • Haibo Huang
    • 1
  • Kent D. Rausch
    • 1
  • Mike E. Tumbleson
    • 1
  • Vijay Singh
    • 1
  1. 1.Agricultural and Biological EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaUSA

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