Patent ID: 7601311
Filing Date: 2009-10-13
Classification: C07C,Y02P

Abstract:
1. An integrated apparatus for co-producing xylene and pure benzene comprising: a. a transalkylation reaction loop containing at least one transalkylation reaction zone containing transalkylation catalyst, said transalkylation zone being adapted to receive feed comprising lower aromatics comprising at least one of benzene and toluene and higher aromatics comprising C b. a disproportionation loop containing a toluene distillation column being adapted to received said higher boiling fraction from the benzene column of the transalkylation loop, said toluene distillation column adapted to provide a toluene-containing lower boiling fraction and a C c. a fluid communication line between the transalkylation loop and the disproportionation loop adapted to supply intermittently or continuously a sufficient portion of the lower boiling toluene-containing fraction from the toluene column of the disproportionation loop to the transalkylation reactor to maintain the content of benzene less than about 15 mass percent and the content of benzene coboilers less than about 10 mass percent in the disproportionation loop.