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COOBAF FUNDED PROJECTS economically feasible process could be established despite relatively low productivity. An effective downstream workup process was also developed successfully. The quantities of acetone produced from CO2 and H2 by fermentation in- creased significantly over the three-year project period. A continuous lab- oratory fermentation setup was able to generate acetone at a productivity level of more than 0.1 g/(l·h) over a prolonged period. In view of current market prices for acetone, CO2 and H2 and the ongoing fall in the price of oil-based products, the biotechnological process devel- oped for microbial acetone production does not, at present, represent an economically viable alternative to the existing petrochemical procedures in which acetone is produced from benzene and propane. In addition to mar- ket prices for acetone, CO2 and H2, other factors that have a key effect on the cost efficiency of this kind of alternative acetone production process are the process yields, the product concentrations and the productivity that can be achieved using acetogenic microorganisms. The results obtained in this project indicate that the bacterial strains need to be optimised further in order to boost productivity sufficiently so that the overall process is economically viable at the industrial scale. This type of bacterial strain development work would typically require at least three more years of research. Once the bacterial strains have been optimised, the microbial acetone production process would need to be expanded to indus- trial production levels, which would involve the systematic scale-up of the process from the laboratory to a mini-plant setup in a technical centre and, finally, a pilot plant capable of producing several thousand metric tons of acetone. 67PDF Image | Chemical Processes and Use of CO2
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