Raman spectroscopic analysis of slurry polymerization

Borealis’ monitoring of polypropylene and polyethylene grades during olefin polymerization reactions in continuously fed loop reactors

We Raman spectroscopic analyzer systems offer real-time, non-destructive measurements in a slurry mixture for process characterization and feedback control. Results confirmed the potential for using Raman spectroscopy to improve process understanding and control, with the aim of achieving specific properties of the material consistently within specification.

Borealis sought an innovative solution to track monomer and reactant depletion and polymer product formation in a slurry, with the goal of:

Customer challenges

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Borealis chose to partner with Endress+Hauser because of its established history as a trusted provider for Raman spectroscopy in ATEX environments. The first phase of the project was to use Raman spectroscopy at a lab-scale reactor for monitoring slurry polymerization. Success could then justify further investment and evaluate implementation at subsequent pilot and manufacturing scales. The Raman system consisted of the following components:

Our solution

▖Rxn2 analyzer – 532 nm ATEX

▖Rxn-40 immersion probe

▖Production yield: limits off-specification material production when switching between grades            and allows for faster switching

▖Production uptime: prevent unplanned shutdowns due to close                    monitoring of the reaction process

▖Increasing production efficiency: Lack of precise monitoring inevitably leads to off-                              specification materials.

▖Improving product quality: Real-time monitoring of polymer output helps to keep material                           production in spec.

▖Reducing downtime: Enhanced monitoring of anomalies during the             polymerization process can help limit such downtime.