Patent ID: 9328040
Filing Date: 2016-05-03
CPC Classification: C07C

Claim Text:
1. A method for the recovery of a benzene rich liquid stream and a light ends vapor stream in a xylene isomerization process from a feedstock, the method comprising: passing a feedstock into a deheptanizer in which the feedstock is separated into a deheptanizer vapor phase and a deheptanizer liquid phase, the deheptanizer vapor phase containing hydrocarbons with seven carbon atoms or less, and the deheptanizer liquid phase containing hydrocarbons with eight carbon atoms or more; passing the deheptanizer vapor phase from the deheptanizer to a first separation zone; separating the deheptanizer vapor phase in the first separation zone into a first liquid phase and a first vapor phase; passing the first liquid phase from the first separation zone to a stabilization zone; passing the first vapor phase from the first separation zone to a compression zone in which the first vapor phase is compressed to provide a compressed vapor phase; passing the compressed vapor phase from the compression zone to a second separation zone; separating the compressed vapor phase into a second liquid phase and a second vapor phase in the second separation zone, the second vapor phase being a light ends vapor stream; recovering the light ends vapor stream; passing the second liquid phase to the stabilization zone; separating the first liquid phase and the second liquid phase in the stabilization zone into a recycle vapor phase and a benzene rich liquid stream; recovering the benzene rich liquid stream; and, passing the recycle vapor phase to the second separation zone, wherein the recycle vapor phase is cooled prior to entering the second separation zone.