Abstract
The Rotating Liquid Sheet (RLS) contactor is a novel packing-less gas-liquid contactor where multiple continuous liquid sheets form at the outlet of helical slots in a rotating central feed tube. Each liquid sheet is auger-shaped, and the rotation of the feed tube transfers momentum from the sheets to the gas. Multiple sheets travel in parallel to arrive unbroken at the column wall. The gas travels through the space between adjacent sheets providing close contact between the gas and liquid. Careful design ensures that liquid sheets travel in parallel arcs, enabling scale-up from 150–600 mm diameter column, a size suitable for the speciality chemical or pharmaceutical industries. Pressure drop and flooding measurements using an air/water system compared the RLS contactor with 25 mm Pall Rings. Results for the Pall Rings matched expected performance, while RLS contactor pressure drop was 10% of that measured for the Pall Rings. Mass transfer experiments using an air+CO2/NaOH solution system showed measured mass transfer coefficients using the RLS contactor were comparable to a packed bed (25 mm Pall Rings) of similar specific surface area, while foaming in the packed bed did not occur in the RLS contactor using the same liquid sample. The RLS contactor also displayed minimal entrainment.
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