Patent ID: 6867339

Claim:
A process for producing p-xylene comprising: a) separating a depentanized oil rich in benzene, toluene, C 8 aromatics, and C 9 + aromatics into a first stream of benzene, a first stream of toluene, a first stream of C 8 aromatics, and a first stream of C 9 + aromatics; b) 1) introducing the first stream of toluene and a second stream of toluene from an aromatics alkyl transfer unit into a toluene selective disproportionation unit to conduct toluene selective disproportionation reaction in the presence of hydrogen, to produce a second stream of benzene and a second stream of C 8 aromatics rich in p-xylene; and 2) separating the second stream of C 8 aromatics rich in p-xylene into a first highly pure p-xylene product and a stream of remaining C 8 aromatics; c) introducing at least a part of the first and the second stream of benzene and the first stream of C 9 + aromatics into the aromatics alkyl transfer unit to conduct aromatics alkyl transfer reaction in the presence of hydrogen, to produce the second stream of toluene and a third stream of C 8 aromatics; and d) introducing the first stream of C 8 aromatics, the stream of remaining C 8 aromatics and the third stream of C 8 aromatics into a molecular sieve adsorptive separation and C 8 aromatics isomerization unit to produce a second p-xylene product.