Air-Oil Separation

[TangoCleveland]

I am going to use a vacuum separator to separate air from Dexron III oil at 150F and 5 psia. A vacuum pump on the air outlet will produce the vacuum, and a PD pump on the oil will pump out the oil. We have 60gpm oil and 50scfm air. I have two questions - 1) how much oil vapor will carry over into the air at 5 psia (I don't have a distillation curve), and 2) Do I need a condenser to drop oil vapor out of the vacuum pump discharge (at atmospheric pressure)? I'd appreciate any advice or references. I can provide a P&ID if you want.

 

[25362]

Since Dexron III ATF oils are in the range of an SN 300 base oil they shouldn't actually boil at the prevailing conditions mentioned. This doesn't preclude the carry over of droplets by the oil. No vessel dimensions were given or even whether the separating vessel is vertical or horizontal. I propose you estimate the air velocity and look for coalescers, and/or spray or mist eliminators in the market. Suppliers would, probably, indicate the degree of purity of the outgoing air leaving their offered equipment.