Eastman Chemical Company
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 C.sub.5 to C.sub.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.sub.5 to C.sub.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.sub.2 to C.sub.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.