Patent ID: 9457292
Filing Date: 2016-10-04
CPC Classification: B01D,B01J,C07C,Y02P

Claim Text:
1. A xylene loop system comprising a distillation column fluidly connected with a paraxylene recovery unit selected from a crystallization unit and an adsorptive separation unit, wherein said paraxylene recovery unit is fluidly connected with a first xylenes isomerization unit, the improvement comprising: inserting a subsystem between said distillation column and said paraxylene recovery unit, fluidly connected to said distillation column and said paraxylene recovery unit, said subsystem comprising a separation unit to effectively separate paraxylene and ethylbenzene from metaxylene and orthoxylene, selected from an adsorption unit, a membrane unit, and an extraction unit, and inserting a second xylenes isomerization unit between said subsystem and said distillation column, said second xylenes isomerization unit fluidly connected with said subsystem and said distillation column.