Venetian blind effect

Especially at high gas velocities, the gas leaving the top of the packing may carry off droplets of liquid as a mist. This can be removed by mist eliminators, through which the gas must pass, installed above the liquid inlet. A layer of mesh (of wire, Teflon, polyethylene, or other material) especially knitted with 98 to 99 percent voids, roughly 100 mm thick, will collect virtually all mist particles [18, 124]. Other types of eliminators include cyclones and venetian-blind arrangements [53]. A meter of dry random packing is veiy effective. 

Many years ago, a device called the Centrifix was found to be effective in removing colored material (Table 16-6) from a lubricating-oil stock that was withdrawn above the vaporizer and in reducing the amount of acid that was required to treat the product. A 9-in. layer of steel wool was able to reduce the color to about one-twentieth of the color when no wool was used. Chillas a.nd Weir have also studied the effect of a special baffle, similar to Venetian blinds, on entrainment. 

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