Application
of flash degassing in a rotating packed bed (RPB) has
been experimentally studied using oxygen removal from water as a test
system. It is shown that the process can be well described by two
mass transfer steps in series: an initial flash and subsequent gas–liquid
mass transfer in the rotating bed. Outlet oxygen concentrations close
to the flash equilibrium concentration were obtained at high angular
speeds, without requiring a large degree of superheat. The rotation
of the bed enhances the gas–liquid mass transfer in the packing,
up to a factor 10 by increasing the angular speed from 0 to 400 rad
s–1. This leads to a reduction in the required packed
bed volume and possibly to an energetically more efficient operation
of degassing processes. Moreover, the angular speed yields an extra
degree of freedom during operating, enabling fast-responding operation
at a constant outlet concentration with varying inlet conditions.
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