Processes and systems for formation of recycle-content hydrocarbon compositions
Processes and systems for making recycle content hydrocarbons, including olefins, from recycled waste material. Recycle waste material may be pyrolyzed to form recycle content pyrolysis oil composition (r-pyoil), at least a portion of which may then be cracked to form a recycle content olefin composition (r-olefin). In some cases, a heavy fraction from the cracker effluent may be used to form a recycle content pyrolysis gasoline composition (r-pyrolysis gasoline).
1. A process for making olefins and a cracked gasoline stream, said process comprising:
(a) cracking a cracker feed stream comprising a recycle content pyrolysis oil composition (r-pyoil) and a non-recycle content C2 to C4 composition in a cracker furnace to provide an olefin-containing effluent stream; wherein said olefin-containing stream comprises at least 50% ethylene and/or propylene; wherein said r-pyoil has a C 8 +content of at least 35 weight percent, based on the total weight of said r-pyoil;
wherein said r-pyoil comprises not more than about 30 weight percent total aromatics, based on the total weight of said r-pyoil; wherein said r-pyoil is present in said cracker feed stream in an amount of 5% to 20% by weight, based on the total weight of the cracker feed stream; wherein at least 50 weight percent of said r-pyoil is obtained from the pyrolysis of recycled waste plastic; wherein said pyrolysis oil composition has not been hydrotreated; and
(b) separating said olefin-containing effluent stream in at least one separator downstream of said cracker furnace to provide a light fraction and a heavy fraction, wherein said heavy fraction comprises a recycle content cracked gasoline composition (r-pyrolysis gasoline).
2. The process of claim 1 , further comprising a recovering an olefin stream comprising a recycle content olefin (r-olefin) from said light fraction.
3. The process of claim 1 , wherein said r-olefin comprises predominantly r-ethylene.
4. The process of claim 3 , wherein said r-olefin comprises predominantly r-propylene.
5. The process of claim 1 , wherein at least 5 percent of the total amount of dienes comprise butadiene.
6. The process of claim 1 , wherein at least 5 percent of the total amount of dienes in said olefin-containing effluent stream comprise cyclopentadiene.
7. The process of claim 6 , wherein at least 5 percent of the total amount of dienes in said olefin-containing effluent stream comprise dicyclopentadiene.
8. The process of claim 7 , wherein said heavy fraction comprises at least 1 and/or not more than 99 weight percent of said r-pyrolysis gasoline, based on the total weight of said heavy fraction.
9. The process of claim 8 , further comprising separating said heavy fraction in a column to form a light gasoline stream and a heavy gasoline stream, wherein at least one of the light gasoline stream and the heavy gasoline stream comprise at least a portion of said r-pyrolysis gasoline.
10. The process of claim 9 , further comprising at least a portion of said light gasoline stream and/or said heavy gasoline stream to form a hydrocarbon product.