This package was supplied to a company processing chemical intermediates and speciality chemicals.
The package is basically a steam ejector-liquid ring vacuum pump combination set, with the vacuum pump operated on a closed loop basis.
The vapours from the process are varied and corrosive, and to combat the vapours, the steam-ejector stage was constructed from PTFE for all contact parts. The interstage condenser is a graphite block unit, fed with cooling tower water with condensate falling to a receiver vessel.
The liquid pump ring is operated using caustic solution as a ring medium.
The caustic strength is kept to 5% to prevent salt formation, and the pH is monitored on a regular basis prior to dumping and refill.
Please click on the above image to see a larger version of the diagram.