The desorption of COP from supersaturated water solution has been extensively studied using a string-of-spheres apparatus. Dissolved gas supersaturation, liquid flow rate, gas phase composition, and the nature of the solid spherical surfaces were varied. When the ratio of the partial pressure of dissolved gas to total system pressure was below unity, mass transfer was purely diffusional whereas for values of this ratio greater than unity, desorption was accompanied by the rapid generation of gas bubbles. Spheres which were artificially roughened gave higher bubbling desorption rates than smooth polished spheres. No such differences were detected in the absence of bubbling. Mass transfer coefficients were found to be higher for absorption than for non-bubbling desorption.
Experiments have been conducted using a simple stirred cell apparatus over the temperature range 22 to 88 °C to elucidate the effects of dissolved gas supersaturation and solvent vapor pressure on the inception of bubbling in desorption from aqueous solution. The transition from bubbling to diffusive desorption is found to occur when the ratio of dissolved gas partial pressure to total system pressure Is unity. It is independent of the solvent vapor pressure.
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