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Gas-liquid mass transfer in cocurrent froth flow

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Abstract

The absorption of ammonia and oxygen in horizontal cocurrent gas-liquid froth flow in a 1-in. I.D. pipe has been investigated. At superficial liquid rates between 2 × 106 and 3.2 × 106 lb./(hr.)(sq.ft.) and superficial gas rates between 5 × 103 and 18 × 103 lb./(hr.)(sq.ft.), the length of a transfer unit in both systems was between 0.5 and 4.0 ft. The effects of distance and temperature were also investigated.

With the use of James and Silberman's data on bubble size and distribution in froth flow to estimate average bubble sizes, the gas-phase-controlled ammonia absorption data could be explained by the model of unsteady state transfer from a stagnant sphere. With the use of an interfacial-area estimate from the ammonia results, the liquid-phase-controlled oxygen absorption data were correlated by a Sherwood number characterizing the transfer from the bubbles, a Reynolds number characterizing the turbulence within the system, and the void fraction.

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