Optimum steam addition to cracking coils to crack pyoil

Abstract

A cracker stream is provided that contains a recycle content pyrolysis oil composition, a predominantly C5 to C22 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 C5 to C22 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 C2 to C4 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.

What is claimed is: 
     
         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.