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Weeping is when liquid flows downward through the holes in a distillation tray. Normally vapor rises up through the holes and contacts the liquid on the tray. If the vapor rate is too low the liquid may be able to drop to the next stage through the holes, resulting in less than optimal vapor/liquid contact (and therefore less than optimal separation). Condensed liquid from above trays is generally distributed onto a distillation tray via a weir.

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14y ago
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11y ago

Weeping is caused due to low vapor velocity. As vapor velocity is not enough, vapors will not pass through tray holes, moreover vapors will pass through gap between tray and column. So, there will not be vapor liquid equilibrium on a tray.

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Q: Why is weeping not good in a distillation column?
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