公开(公告)号：US20190292280A1

公开(公告)日：2019-09-26

申请号：US16436306

申请日：2019-06-10

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Philip Henri Cornelissen ,  Henri Aime Lammens ,  Fausto Franco Ciancio ,  Christopher K. Morgan ,  Leo Reynders

IPC: C08F110/02 ,  B01J3/03 ,  C08F10/00 ,  B08B1/00 ,  B01J19/02

Abstract: Both a system and method for cleaning a tow pressure separation vessel of a high pressure polyethylene polymerization plant are provided. The system includes a polytetrafluoroethylene lining that covers the interior surfaces of the vessel, and a cover mounting assembly including an annular clamp for detachably mounting a cover over the vessel. The mounting assembly includes a clamp actuator for quickly securing and releasing the cover with respect to a top rim of the vessel. The vessel is drained of liquid polyethylene and allowed to cool to ambient temperature, thus creating a frozen “skin” of polyethylene around the interior surfaces of the vessel. The clamp actuator releases the cover. The polyethylene skin is peeled off the interior sides the vessel and gathered up at the top to form a neck, thus peeling the polyethylene skin away from the polytetrafluoroethylene lining along with any degraded polymers or other impurities that have accumulated on the interior surfaces of the vessel.