Mass transfer phenomena and hydrodynamics in agitated gas—liquid reactors and bubble columns at elevated pressures: State of the art = Stoffübergangserscheinungen und hydrodynamik in gerührten gas-flüssigkeitsreaktoren und blasensäulen bei hohen drucken: Stand der technik

摘要

All important studies on the influence of pressure on mass transfer phenomena in gas—liquid systems and reactors are reviewed critically. Points of agreement and conflict are indicated and discussed.udIt is concluded that: (1) the initial bubble size at a single orifice decreases with increasing pressure; (2) the gas-phase mass transfer coefficient kG is inversely proportional to the pressure to the power n, where n depends on the mass transfer mechanism; (3) the liquid-phase mass transfer coefficient kL is not influenced by pressure; (4) the gas hold-up G in bubble columns increases with increasing pressure.udHowever, insufficient data on the influence of the operating pressure on the interfacial areas in gas—liquid contactors are available.