Abstract: Vacuum pumps are very important rotating equipment in styrene extraction plants, which are used to ensure the vacuum degree of the process system. This paper analyzes the factors that should be taken into consideration in the selection of vacuum pumps. It points out that not only the operating parameters such as vacuum degree, gas volume and so forth, but also the medium characteristics should be taken into account. The analysis concludes that liquid-ring vacuum pumps are more suitable for styrene extraction plants. In addition, this paper also elaborates on the stage selection, anti-cavitation setting, seal configuration and energy-saving design of liquid-ring vacuum pump, which is intended to provide reference for engineering design.

Key words: styrene extraction, liquid-ring vacuum pump, engineering design, cavitation