公开(公告)号：US3607960A

公开(公告)日：1971-09-21

申请号：US3607960D

申请日：1970-06-18

Applicant: GULF RESEARCH DEVELOPMENT CO

Inventor： BUTTON DELBERT L ,  KIRBY LAWRENCE J

IPC: C07C4/00 ,  C07C4/16 ,  C07C15/04 ,  B01D3/06 ,  C07C3/58

CPC classification number: C07C15/04 ,  C07C4/00 ,  C07C4/16 ,  Y02P20/582

Abstract: In a process for the thermal hydrodealkylation of an alkyl aromatic, such as toluene, to produce benzene, a mixture of diphenyls and high-boiling polymers is separated as bottoms from the effluent of a primary hydrodealkylation zone. This mixture is mixed with recycle hydrogen and flash vaporized, the vapor comprising polyphenyls and hydrogen being passed to an auxiliary reactor wherein the polyphenyls are converted to benzene. The flash vaporization selectively rejects substantially all of the high-boiling polymer compounds which would otherwise tend to form coke in the auxiliary reactor.