Meaning
Fractionation processes divide the liquid output of plastics chemical recycling into high-value chemical feedstocks and heavy residue fractions. The pyrolysis fuel oil split determines the proportion of recycled oil that can be fed into steam crackers for new polymer production versus the fraction used for energy recovery. This ratio directly affects the yield of circular ethylene and propylene.
It dictates the mass balance credits a polymer manufacturer can claim on their circular resin datasheets. Cracker operators adjust their feedstock intake based on this output ratio.
Feedstock Yield
Crackers cannot easily process the heavy, high-boiling compounds present in pyrolysis fuel oil. Optimizing the pyrolysis fuel oil split to minimize the heavy fraction increases the volume of light naphtha-like oil available for polymerization. This directly lowers the raw material cost for the production of circular polypropylene.
Reactor Maintenance
Heavy residues contain high levels of ash and chlorine contaminants that damage cracker furnaces. A poor pyrolysis fuel oil split allows these heteroatoms to carry over, which leads to coke formation and catalyst poisoning in the downstream reactors. Preventing this contamination protects the continuous polymer production.
Sourcing Economics
Resin prices are heavily dependent on the efficiency of the chemical recycling pathway. An unfavorable pyrolysis fuel oil split reduces the profitability of recycling plants, which raises the price premium of certified circular resins for the molder. Molders must factor this premium into their component cost estimations.
