OPTIMUM STEAM ADDITION TO CRACKING COILS TO CRACK PYOIL
A cracker stream is provided that contains a recycle content pyrolysis oil composition, a predominantly C 5 to C 22 hydrocarbon composition, and steam at a steam-to-hydrocarbon ratio of at least 0.60:1. The method for making olefins includes: (a) combining a predominantly C 5 to C 22 hydrocarbon stream with a recycle content pyrolysis oil composition (r-pyoil) to provide a combined cracker stream; and (b) cracking the combined cracker stream in a cracker furnace to provide an olefin-containing effluent stream, wherein the combined cracker stream contains steam at a steam-to-hydrocarbon ratio greater than 0.60:1. There is also provided a cracker stream including r-pyoil), a predominantly C 2 to C 4 hydrocarbon composition, and steam at a steam-to-hydrocarbon ratio of at least 0.20:1. Olefins can be made from this cracker stream as well.
1 . A cracker stream comprising a recycle content pyrolysis oil composition (r-pyoil), a predominantly C 5 to C 22 hydrocarbon composition, and steam, wherein the steam-to-hydrocarbon ratio of said cracker stream is at least 0.60:1.
2 . The cracker stream of claim 1 , wherein said steam-to-hydrocarbon ratio is not more than 0.90:1.
3 . The cracker stream of claim 1 , wherein at least 70 weight percent of said r-pyoil is obtained from the pyrolysis of waste plastics, waste textiles, waste carpet fibers, waste modified cellulose, waste biomass, post-industrial waste streams, intermediate industrial waste streams, or combinations thereof.
4 . The cracker stream of claim 1 , wherein said C 5 to C 22 composition is present in an amount of at least 40 weight percent based on the total weight of said cracker composition.
5 . The cracker stream of claim 1 , wherein said r-pyoil has a boiling point curve defined by 90% boiling point of not more than 250° C.
6 . The cracker stream of claim 1 , wherein said r-pyoil is present in said cracker composition in an amount of at least 5 wt. % and not more than 40 wt. %, based on the total weight of said cracker composition.
7 . The cracker stream of claim 1 , wherein said r-pyoil has a C12+ content of not more than 40 wt. %, based on the total weight of said r-pyoil.
8 . The cracker stream of claim 1 , wherein said cracker composition has a vapor fraction of at least 0.7.
9 . A method for making one or more olefins, said method comprising:
(a) combining a predominantly C 5 to C 22 hydrocarbon stream with a recycle content pyrolysis oil composition (r-pyoil) to provide a combined cracker stream; and
(b) cracking said combined cracker stream in a cracker furnace to provide an olefin-containing effluent stream,
wherein said combined cracker stream further comprises steam and has a steam-to-hydrocarbon ratio greater than 0.60:1.
10 . The method of claim 9 , wherein said steam is added to said r-pyoil composition and/or said combined cracker stream in a convection section of said cracker furnace.
11 . The method of claim 9 , wherein said steam is added to said r-pyoil composition and/or said combined cracker stream in a cross-over section of said cracker furnace.
12 . A cracker stream comprising a recycle content pyrolysis oil composition (r-pyoil), a predominantly C2 to C4 hydrocarbon composition, and steam, wherein the steam-to-hydrocarbon ratio of said cracker stream is at least 0.20:1.
13 . The cracker stream of claim 12 , wherein at least 30 wt. % of said r-pyoil is obtained from the pyrolysis of waste plastic.
14 . The cracker stream of claim 12 , wherein said C2 to C4 composition is present in an amount of at least 50 wt. %, based on the weight of the cracker stream.
15 . The cracker stream of claim 12 , wherein said cracker stream comprises predominantly propane or ethane.
16 . The cracker stream of claim 12 , wherein said r-pyoil has a boiling point curve defined by a 90% boiling point of not more than 250° C.
17 . The cracker stream of claim 12 , said r-pyoil has not been hydrotreated.
18 . A method for making one or more olefins, said method comprising:
(a) combining a predominantly C 2 to C 4 hydrocarbon stream with a recycle content pyrolysis oil composition (r-pyoil) to provide a combined cracker stream; and
(b) cracking said combined cracker stream in a cracker furnace to provide an olefin-containing effluent stream,
wherein said combined cracker stream further comprises steam and has a steam-to-hydrocarbon ratio of at least 0.20:1.
19 . The method of claim 18 , wherein said steam-to-hydrocarbon ratio is not more than 0.60:1.
20 . The method of claim 18 , wherein said steam is added to said r-pyoil composition and/or said combined cracker stream in a cross-over section of said cracker furnace.
21 . The method of claim 18 , wherein said combined cracker stream comprises at least 60 wt. % non-recycled propane, ethane, or combinations thereof.