Design of Settler and Separator for Immiscible Liquids.A vertical cylindricalsettler-separator is to
be designed for separating a mixture flowing at 20.0 m
3
/h and containing equal volumes of a light
petroleum liquid (
B ρ = 875 kg/m
3
) and a dilute solution of wash water (
A ρ = 1,050 kg/m
3
).
Laboratory experiments indicate a settling time of 15 min is needed to adequately separate the two
phases. For design purposes use a 25-min settling time and calculate the size of the vessel needed, the
liquid levels of the light and heavy liquids in the vessel, and the height
2 A
h of the heavy liquid
overflow. Assume that the ends of the vessel are approximately flat, that the vessel diameter equals its
height, and that one-third of the volume isvapor space vented to the atmosphere.