Patent ID: 11945998
Assignee: EASTMAN CHEMICAL COMPANY
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A process for making olefins, said process comprising:
(a) pyrolyzing a feed stream comprising recycle waste material in a first section of a cracking furnace to provide a stream comprising a recycle content pyrolysis composition (r-pyrolysis stream); and
(b) cracking at least a portion of said r-pyrolysis stream in a second section of said cracking furnace to form an olefin-containing effluent; wherein said 1st and 2nd sections are in a single cracking furnace; and wherein said first section is at least partially heated by said second section; where said olefin-containing effluent predominantly comprises propylene; and wherein said cracking furnace has been retrofitted from a furnace previously used to crack alkanes to form olefins; wherein said pyrolyzing and cracking are done in said single cracking furnace; wherein said r-pyrolysis stream has a C8+ content of at least 15 weight percent, based on the total weight of said r-pyrolysis stream; and wherein said r-pyrolysis stream comprises not more than about 25 weight percent total aromatics, based on the total weight of said r-pyrolysis stream.