Patent ID: 6774273
Filing Date: 2004-08-10
Classification: C07C,Y02P

Abstract:
A process or the selective disproportionation of toluene and the disproportionation and transalkylation of toluene and C9+ aromatics comprising:a) separating a feed stream comprising benzene, toluene, C8 aromatics, and C9+ aromatics into a first benzene stream, a toluene stream, a first C8 aromatics stream, and a C9+ aromatics stream; b) introducing part of the toluene stream into a toluene selective disproportionation unit to conduct the toluene selective disproportionation reaction for producing a first effluent comprising C8 aromatics rich in p-xylene, and benzene; c) separating a second C8 aromatics stream and a second benzene stream from the first effluent produced in the step of b); d) introducing another part of the toluene stream and the C9+ aromatics stream into a toluene disproportination and transalkylation unit to conduct the toluene disproportionation and transalkylation reaction in the presence of hydrogen for producing a second effluent comprising C8 aromatics and bezene; e) separating a third C8 aromatics stream and a third benzene stream from the second effluent produced in the step of d); and f) separating the first, and third C8 aromatics stream into a p-xylene product and a remaining mixed xylenes stream.