公开(公告)号：US3772396A

公开(公告)日：1973-11-13

申请号：US3772396D

申请日：1972-01-17

Applicant: HOECHST AG

Inventor： BOESENBERG H ,  FRENSCH H ,  LORENZ H

IPC: B01J10/02 ,  C07C4/22 ,  C07C3/26

CPC classification number: B01J10/02 ,  B01J19/1887 ,  B01J2219/00103 ,  C07C4/22 ,  C07C2601/10 ,  C07C13/15

Abstract: DICYCLOPENTADIENE IS THERMALLY SPLIT TO YIELD CYCLOPENTADIENE BY FIRST EVAPORATING DICYCLOPENTADIENE IN A FILM EVAPORATOR, CARRYING THE VAPOR TO A TUBE-TYPE HEAT EXCHANGER, CRACKING THR VAPOR AND RECTIFYING THE CYCLOPENTADIENE. CRACKING IS CARRIED OUT AT 270-400*C., THE VAPOR BEING PASSED THROUGH THE HEAT EXCHANGER AT A VELOCITY SUCH TO YIELD A RESIDENCE TIME OF 6-12 SECONDS IN A TURBULENT FLOW. CYCLOPENTADIENE OF ABOUT 99.9% PURITY IS OBTAINED, AND THE CONVERSION RATE IS OVER 90%.