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COOBAF involves the formation of acetyl-CoA as the central intermediate, which is then used as the starting reagent for the desired acetone production. 1.7.2 Project description The aim of the project was to establish a fermentation process for the bio- technological production of acetone using acetogenic microorganisms and carbon dioxide (CO2) as the sole carbon source (Figure 22). More specifically, the objective was to use industrial flue gases, which in addition to CO2 also contain carbon monoxide (CO) and hydrogen (H2), in order to produce ace- tone – a valuable primary material for the chemical industry – via a sustain- able and cost-efficient fermentation process. The microbial production of acetone using acetogenic bacterial strains and CO2-containing flue gas streams has the potential to provide an economical alternative to the petrochemical production route that would also conserve resources and protect the environment. An important part of this research project concerned the selection of suit- able bacterial strains. These strains must be able to tolerate the gas mixture and any toxic components it contains and would, ideally, be able to achieve quantitative conversion of the CO2. In contrast to petrochemical raw mate- rials, like propene, or renewable raw materials, such as glucose or saccharose, there is an almost unlimited supply of CO2 and it is available at significantly lower costs. It therefore seemed possible that even at relatively low levels of productivity, the process could be implemented so as to be economically viable. FUNDED PROJECTS Fig. 22: Schematic representation of the fermentation process in the biotechnological production of acetone with CO2 as the sole carbon source CO2 fixation and acetone formation by genetically modified acetogenic bacteria Industrial CO2-containing exhaust gas streams Bacterial reactor Aceton 63PDF Image | Chemical Processes and Use of CO2
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