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

Claim 1:
2. A process for making olefins, said process comprising:
(a) pyrolyzing a stream comprising recycle waste material in a first section of a cracking furnace;
(b) separating the pyrolyzed stream into a light fraction and a heavy fraction; and
(c) cracking at least a portion of said light fraction in a second section of said cracking furnace; 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; wherein said olefin-containing effluent predominately 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 35 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.