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Process configurations – oxygen-alkali delignification Pressurised reactors Oxygen (O) and hydrogen peroxide stages reinforced with O2 (PO) use pressurised reactors, but they can also be used in ozone (Z) and chlorine dioxide (D) stages. The design pressure and temperature depend on the process application. Normal pressure levels are 5–12 bar overpressure at 100–130 °C. Oxygen
