Patent ID: 8993825
Filing Date: 2015-03-31
Classification: B01D,C07C,C10G,Y10S

Abstract:
1. A process for producing one or more individual xylene isomers from feed streams containing C 8 aromatics and C 9 -and-heavier aromatics, comprising: (a) a distillation process comprising two or more xylene columns separating C (b) a xylene-isomer separation process to recover one or more xylene isomers from one or both of the first and second C (c) a desorbent-recovery process to separate the first mixture of step (b) by distillation in an extract column with a reboiler having an operating pressure of at least 300 kPa to obtain the one or more individual xylene isomers and a desorbent stream returned to the xylene isomer separation process, wherein the bottoms stream of the at least one second xylene column of step (a) further exchanges heat to supply a reboiler of a raffinate column.