This reliable and versatile process produces products meeting the requirements of the most demanding applications, while maintaining a strong focus on health, safety and environmental issues. The gas-phase process features lower total installation costs TIC and is very competitive in cash production costs. Performance Characteristics The Novolen technology gas-phase process utilizes one or two identical vertical gas-phase stirred bed reactors. Homopolymers and random copolymers can be manufactured either in a single reactor or in a reactor cascade with two reactors, depending on the required capacity and product range. Alternatively, two reactors can be operated in parallel to achieve higher capacities for a single train plant and to produce bimodal resins.
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Description Benefits Literature Contact Propylene, ethylene and any other required comonomers are fed into the reactor s. Hydrogen is added to control the molecular weight. Polymerization conditions temperature, pressure and reactant concentrations are set by the polymer grade to be produced. The reaction itself is exothermic. Reactor cooling is achieved by evaporation of liquefied reactor gas, which is injected into the reactor.
Flash evaporation of the liquid in the polymer bed ensures the most efficient heat removal. The polymer powder is discharged from the reactor s and separated from the gas in a discharge cyclone at atmospheric pressure.
Any unreacted monomer separated from the powder is compressed and either recycled or returned to the upstream olefins unit for recovery. The final degassing of the polymer is done in a purge silo by flushing with nitrogen. The purge offgas is sent to a recovery system. Finally, the powder is converted into pellets that incorporate a full range of well-dispersed additives. For highly demanding applications, which require extremely low levels for volatiles and odor, the gas-phase process offers an optional desorber unit to treat the pellets after extrusion.
Due to the simplicity of the gas-phase process, the capital expenditures for inside battery limits ISBL of a Novolen technology process plant are the lowest in the industry. This investment cost advantage for world-scale plants producing high value products further increases the attractiveness for investors. The Novolen gas-phase process includes standardized packages for high-efficiency monomer recovery. Proven reliability and minimized equipment count lead to highly competitive maintenance costs.
Two identical reactors connected in a row allow for impact copolymer production and also for homopolymer production Exclusive vacuum degassing at extruder. Products at the lowest edge of volatile content in the marketplace with very low taste and odor level for highly demanding applications for example, drinking water pipes and food packaging. Can be combined with our exclusive desorber technology Simple, solvent-free gas-phase process.
Among the lowest operating and maintenance costs in the industry Drop-in metallocene catalyst. Rapid grade changes.
Lummus Technology India (CB&I)
Novolen® Gas-Phase Process