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DOI: 10.5445/IR/1000081050
Veröffentlicht am 14.03.2018

Formic Acid Formation by $Clostridium$ $ljungdahlii$ at Elevated Pressures of Carbon Dioxide and Hydrogen

Oswald, Florian; Stoll, I. Katharina; Zwick, Michaela; Herbig, Sophia; Sauer, Jörg; Boukis, Nikolaos; Neumann, Anke

Low productivities of bioprocesses using gaseous carbon and energy sources are usually caused by the low solubility of those gases (e.g., H2 and CO). It has been suggested that increasing the partial pressure of those gases will result in higher dissolved concentrations and should, therefore, be helpful to overcome this obstacle. Investigations of the late 1980s with mixtures of hydrogen and carbon monoxide showed inhibitory effects of carbon monoxide partial pressures above 0.8 bar. Avoiding any effects of carbon monoxide, we investigate growth and product formation of Clostridium ljungdahlii at absolute process pressures of 1, 4, and 7 bar in batch stirred tank reactor cultivations with carbon dioxide and hydrogen as sole gaseous carbon and energy source. With increasing process pressure, the product spectrum shifts from mainly acetic acid and ethanol to almost only formic acid at a total system pressure of 7 bar. On the other hand, no significant changes in overall product yield can be observed. By keeping the amount of substance flow rate constant instead of the volumetric gas feed rate when increasing the process pressure, we i ... mehr

Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -Technologie (IKFT)
Institut für Bio- und Lebensmitteltechnik (BLT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2296-4185
URN: urn:nbn:de:swb:90-810507
KITopen-ID: 1000081050
Erschienen in Frontiers in Bioengineering and Biotechnology
Band 6
Seiten Art.Nr. 6
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte Clostridium ljungdahlii; high-pressure fermentation; acetogenic bacteria; acetic acid; formic acid; mass transfer
Nachgewiesen in Web of Science
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