Bench-scale demonstration of biological production of ethanol from coal synthesis gas. Quarterly report, April 1, 1993--June 30, 1993
Three bacteria, Clostridium ljungdahlii and isolates ERI-8 and 0-52, have been utilized in CSTR studies in order to directly compare the performance of the bacteria in continuous culture in converting synthesis gas components to ethanol. C. ljungdahlii is able to produce higher concentrations of ethanol than the other bacteria, largely because medium development with this bacterium has been ongoing for 2--3 years. However, both of the ERI isolates are quite promising for ethanol production and, therefore, will be studied further in the CSTR. A comparison of the energy costs for various ethanol recovery techniques has been made for use in the bench scale system. The techniques considered include direct distillation, extraction with various solvents followed by distillation, air stripping followed by distillation, pervaporation followed by distillation, reverse osmosis and temperature swing extraction. Extraction with a solvent possessing a relatively high distribution coefficient for ethanol and a high separation factor (relative ability to extract ethanol in favor of water), followed by distillation, is the most desirable technology.
- Research Organization:
- Engineering Resources, Inc., Fayetteville, AR (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-92PC92118
- OSTI ID:
- 10180727
- Report Number(s):
- DOE/PC/92118-T2; ON: DE93041244
- Resource Relation:
- Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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