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Southern Bio-Products Conference

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Adipic. Synthetic. 478. 0.42. Maleic. Synthetic. 3. 1.00. Succinic. Fermentation. 7. 3.00. Tartaric ... Unreactive Species at Near Neutral pH ... – PowerPoint PPT presentation

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Title: Southern Bio-Products Conference


1
Recovery of Organic Acids From Fermentation
Broths Southern Bio-Products
Conference March 4-6, 2004 Beau Rivage
Resort Biloxi, MS Tim Eggeman, Ph.D., P.E. Dan
Verser, Ph.D. ZeaChem Inc.
2
Organic Acids - Today
Organic Acid Price, /lb (100 Basis) US Demand, MM lb/yr Common Route
Formic 0.46 50 Synthetic
Acetic 0.42 5,286 Synthetic
Oxalic 0.38 17 Synthetic
Propionic 0.49 202 Synthetic
Lactic 0.80 176 Fermentation
Tartaric 3.00 7 Fermentation
Succinic 1.00 3 Synthetic
Maleic 0.42 478 Synthetic
Adipic 0.70 1,725 Synthetic
Citric 0.75 600 Fermentation
3
Points of View
  • Sugars
  • Inexpensive
  • Under-Utilized
  • More Sustainable
  • Synthetic Routes will Eventually be Displaced
  • Platform Viewpoint is Under-Utilized
  • Biology plus Better Technology and
  • Chemistry Market Diversification

4
Generic Platform
5
C2 Platform
6
Issues in Recovery
  • pH of Broth
  • Unreactive Species at Near Neutral pH
  • Commodity Scale Production is Constrained by Need
    to Avoid Salt Coproduction
  • Dilute Broths
  • Evaporating Water is Expensive
  • Prefer Selective Methods for Removing Organic
    Acids from Water

7
Effect of pH
8
pH Options
  • Low pH Fermentation
  • Neutral pH Fermentation
  • Direct Acidification
  • Amine Complex Formation
  • Other
  • Bipolar Electrodialysis
  • Esterases

9
Lactic Acid - Traditional
Alcohol
Water
Hydrolysis
Sulfuric Acid
Ester
Lime
Lactic Acid
Direct Acidification
Fermentation
Esterification
Sugars
Water
Gypsum
10
Direct Acidification
US Demand for Lactic Acid 176 MM lb/yr, Gypsum
Coproduct 252 MM lb/yr !!!
11
Lactic Acid Amine Extraction
(From Baniel, A.M. et. al., US Pat. 5,510,526)
12
Citric Acid Lime/Acid
Lime
Fermentation
Precipitation
Sugars
Residue
Sulfuric Acid
Water
Calcium Citrate
Acidification
Crystallization
Citric Acid
Gypsum
13
Citric Acid Amine Extraction
Water
Forward Extraction
Water
Back Extraction
Sugars
Fermentation
Crystallization
Citric Acid
Residue
14
Formic Acid
Water
Formic Acid
CO
Carbonylation
Hydrolysis
Methyl Formate
Methanol
Methanol
15
Some Common Themes
  • Eliminating Salt Coproduction is Difficult
  • Microbiology
  • Careful Selection of Cations and Recovery Scheme
  • Common Purification Methods
  • Amine Extraction
  • Esterification

16
Routes to Ethanol
17
Lab Status - Fermentation
  • Lab Scale Fermentation
  • Strain Moorella Thermoacetica ATCC 39073
  • Media GlucoseCorn Steep Liquor
  • Batch Results
  • First Run 28 g/l acetate
  • Goal 35-50 g/l acetate, yield 85 of
    theoretical

18
Lab Status - Recovery
  • Lab Scale
  • Amine Complex Formation w/ CaCO3 Precipitation
  • Extraction of Amine Complex
  • Esterification
  • Results to Date
  • 97 CaCO3 Recovery
  • Excellent Extraction (KD gt 2)
  • Ester Yield 75 of Theoretical

19
Conclusions
  • Technical Issues
  • pH and Avoidance of Salt Coproduction
  • Dilute Broths
  • Advantages of Platform Viewpoint
  • New Routes Based on Biology and Chemistry
  • Market Diversification

20
Acknowledgements
  • US Department of Energy - Inventions and
    Innovation Program (Grant Number
    DE-FG36-03GO13010)
  • Support by US DOE Does Not Constitute an
    Endorsement by US DOE of the Views Expressed in
    this Presentation
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