Separating hydrocarbon from water

Assume that a reflux drum operates at 100°F. The water leg should allow 100-micron oil droplets to “settle” upward. This will produce “good separation” of oil from water. If flow is laminar, we may substitute in Equation 300-5 and obtain the following equation (plotted in Figure 300-3) for allowable water velocity in the leg:

Recommended Downward Velocity in Water Drawoff Legs

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