Technology Unit

: Liquid-Liquid-Vapor Separator
: Generic Ethylbenzene Dehydrogenation Process
Short Name: LLV Separator
Description: The Styrene present at the Exit Stream of the Conversion Reactor must be separated and purified from the rest of the other Chemicals contained on it (Water, Toluene, etc.). To accomplish this, the Two-Phase Stream obtained at the exit of the Coolers is sent to a Three-Phase Separator (Liquid-Liquid-Vapor Separator or LLV Separator), which operates at 5 bar and 50 °C. A Gaseous Mixture primarily composed by Hydrogen, Methane and Ethylene (as well as minor amounts of Water and Styrene) is obtained at the top of the LLV Separator (Light Gaseous Stream), while a Liquid Stream containing Water and certain traces of Styrene, Benzene and Ethylene is obtained at the Bottom of this Equipment (Wastewater Stream). The Middle Stream (Useful Stream) contains mainly Styrene, as well as minor amounts of the other Chemicals, and is sent to the Distillation Column No. 1 (Benzene-Toluene Column).
Link: https://www.redalyc.org/journal/2570/257054721002/html/