Polymer Recovery
Advanced thermochemical recycling systems integrate recovered packaging polymers with petrochemical refinery feedstocks to produce virgin-equivalent chemical intermediates. Polyolefin co-processing introduces segregated polyethylene and polypropylene fractions, extracted from plastic-laminated paperboard and flexible packaging scrap, into industrial crackers, fluid catalytic cracking units or gasification plants. This industrial method converts multi-layer barrier films and plastic coatings into basic hydrocarbon monomers, synthesis gas or pyrolysis oils alongside conventional petroleum inputs.
It operates exclusively within refinery and petrochemical processing boundaries, ending when synthesized hydrocarbons enter polymerization reactors.
Thermal Processing
Converting laminated paper packaging yields substantial plastic-reject streams containing embedded polyethylene, tie layers and minor aluminium traces. During polyolefin co-processing, these mixed polyolefin fractions undergo thermocatalytic cracking at temperatures between four hundred and eight hundred degrees Celsius. High thermal energy fractures long polymer chains into shorter-chain hydrocarbons such as ethylene, propylene and aromatic fractions.
Hydrotreatment removes residual oxygen, nitrogen and halogen contaminants derived from printing inks, barrier layers and organic food residues. The cracked output feeds directly into steam crackers, where it blends with virgin naphtha or ethane feedstocks to manufacture standard chemical precursors without requiring dedicated mechanical reprocessing lines.
Contamination Boundary
Feedstock purity specifications restrict the concentration of non-polyolefin contaminants entering catalytic conversion units. Halogenated compounds, moisture, cellulose fines and aluminium foil in polyolefin co-processing cause catalyst deactivation, pipe fouling and equipment corrosion in hydrotreating reactors. Pretreatment facilities must shred, wash and thermally densify the polymer rejects recovered from paperboard hydrapulpers to eliminate entrained paper fibers and inorganic pigments before thermal cracking.
Stringent limits on chlorine content, typically kept below fifty parts per million, prevent the formation of corrosive hydrochloric acid inside refinery cracking tubes. Chemical refiners employ mass balance allocation protocols to trace recycled molecules through cracking and polymerization stages to certified circular packaging resins.
