Abstract
Liquid jets that strike liquid surfaces entrain gas into the liquid. Normally, the gas can vent out with few adverse consequences. Entrained gas unable to freely vent out may cause liquid backup, instability, liquid maldistribution to packed towers, and excessive venting downstream.Tests in scaled-down models of parting boxes and seal pans provided improved understanding of gas entrainment. Liquid jets issuing from spargers generate uneven frothing in packed tower parting boxes, which leads to liquid maldistribution upon turndown. Impingement plates can alleviate this maldistribution, but need to be vented to avoid trapping gas underneath. Gas entrainment may also be troublesome when liquid from seal pans drops 2 m or more. When sheets of high surface tension liquid descend from seal pans, they tend to form narrow jets that may locally drag gas a considerable depth into the liquid below. With foaming liquids, the gas spreads out over a wide region.
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