In styrene monomer and polystyrene plants are needed lots of vacuum systems generally, and some of the vacuum columns require vacuums of 10 mmHg A or better.
Steam jet ejector were the standard vacuum producers for such applications in the past. A major drawback to using steam has been the contamination of styrene and ethylbenzene with water vapor. One sucessful solution to the problem has been to use roots-liquid ring vacuum system which combined by the water ring vacuum pump and the roots booster vacuum pump.
The vacuum pumps may be sealed with styrene, ethylbenzene or a mixture of both. While eliminating a pollutant, the change to this type of hybrid vacuum system also saves energy.
tags: Roots-Liquid ring Vacuum system
Edited by Catherine Qin / EVP Vacuum Solution