The stream then proceeds to the final phase of the process: the separation. In this phase, the desired product is separated from the by products and the unreacted components. That is, benzene is separated from unreacted toluene, unreacted hydrogen and the by-product methane. This is achieved by introducing the two-phase stream containing benzene, methane, hydrogen and toluene into a high-pressure phase separator, F-1. In this flash drum the vapor and liquid are separated. In the overhead mainly hydrogen and methane exits, and in the bottom some hydrogen, methane, and mainly all the toluene and benzene exit. The overhead stream is split into two streams; one stream is compressed to 25.5 bar in compressor C-1 and is recycle back to the feed and to the reactor, the other stream is a portion of the fuel gas stream. The separation happens at a temperature of 38oC and 23.9 bar.